Frame swap eMTB???

[bram.biesiekierski]

Hi. I'm new here, my names Bram, 35yr old from Perth WA Australia. Forgive the wall of text. It's a bit of an intro and some questions about ebikes.

So up until recently I had never considered an eMTB. I love MTB, and never had any need or want for a motor.

That was up until recently, where I suffered a serious heart injury from the vaccines. I was hospitalised for 5 days and clinically diagnosed with myo-pericarditis, I had a month off work. And now 6 months after that, I am just starting to recover to the point where I can ride a bike again. I'm currently just taking it easy with short rides around rivers and lakes, mostly on pavement, and definitely no elevation. I can't wait to get back into the hills and ride some proper MTB.

Which brings me to the problem. Riding down-hill is fine, I got gravity on my side, it's getting back up where I will now struggle. My heart/cardio isn't what it used to be, and I am now s#!t scared of having a heart attack if I push myself.

So the idea of a eMTB now starts looking like a possible solution. But, I can't afford a new name-brand eMTB. In this state, you need to be vaccinated to work, and I only had 1 dose, so don't count as vaccinated. I have a temp exemption, but that expires soon, and after that there is no way on earth I'm getting any more clot-shots. So money is a bit tight. I have good cash savings, but I don't want to blow it on a bike, when I will likely be unemployed once my current exemption expires.

So I start thinking, well I already have a well spec'd MTB, (a Trek Remedy, with alot of upgrades), all I really need is a eMTB motor/frame/battery right? Perhaps I can purchase just a frame kit, and swap all my components on. But it doesn't look like there is much available. All the manufacturers I've looked at don't sell frames like that.

Then I see the Dengfu frames and think well that looks promising. After looking around. The E22 sounds kinda alright. 150mm travel is about what I like. It takes a big motor, so will get up hill like a champ. The geometry is not great, but it's not bad and definetly workable for my needs. Its got a standard boost 148 frame. The shock eye to eye, and stroke is the same as my current shock (cane creek kitsuma coil 230x65), and similar travel aswell, so probs wouldn't even need to swap the springs. My 160mm fork, bars, brakes, rims/wheels, rear mech, rear cassete etc should all go over. I think the seat post diameter is different, so I'd need a new dropper post and that's about it, (apart from misc parts like brake lines and shifter cables, and anything specific to the eMTB system etc).

I have alot of spares already aswell, like extra cassettes (e13 and xx1 and gx), extra mechs (x01 and gx) extra wheels (i9 and bontragers), spare bars, grips and a couple of stems. A few sets of brakes (hope and srams)

So I think I should be able to piece together all the rest of a bike if I had frame/motor/battery ready to go.

All my wheels are currently 27.5s, and the e22 frame says its 29 compatible, so I might need to either run plus tyres. Or perhaps look at mulleting it to get the BB height back. I like the idea of mulleting it eventually to help slacken it a bit, but don't want to shell out for a new fork I'd I can avoid it

Now I don't know anything about eBikes, or Bafang, or Dengfu.

My concern is how reliable is the frame? Where I ride, there is lots of rock. If I go to the hills, it's all orange coffee Rock. If I go to the coast, it's limestone/coral. Because of the rock, it means there is alot of harsh vibration/chatter compared to more flow trails, and loamy terrain. And if I have an off, then the frame could contact a rock. I don't really go out of my way for jumps. I more prefer descending, and do end up riding a bit of chunky rock shoots etc.

How decent are the Bafang motors? Do they handle MTB well? With crashes, casing bottom outs, dirt/mud etc.

What are people's thoughts on the dengfu frames?

 

[bram.biesiekierski]

Another quick question, what's the go with the ebay Dengfu e22 VS the Alibaba Dengfu e22 ?

It looks like on ebay, they have a straight top tube, and on Alibaba, the top tube has a kind of z bend in it.

What's the best place to get the frames from? Should I try direct with Dengfu?

 

[cemoz]

Hi Bram I’m from your neck of the woods, I get the heart stuff too. I had to get an EMTB after having 3 SCADs (Spontaneous Coronary Artery Dissection) they weren’t to do with the vaccine the inside of my heart arteries just decide to come away and cause heart attacks. It sucked as I didn’t have any other risk factors for heart problems I was a keen MTB er the EMTB has allowed me to keep riding which is damn good.

I did what you want to do, however with a Bosch system was originally going to be a project for my product design course couldn’t get the motor in time for that so I ended up just doing it after the heart stuff as I need the motor assistance now.

I went with Bosch in case I needed replacement parts local shops are decent for small stuff, I got my frame, mounting hardware and wiring from here HYBRID | SchlierseerBikeparts | Hausham
the motor was off eBay and battery from local shop some stuff was taken off my good MTB, I’m currently figuring out how I can turn that to electric to make it my daily bike.

I’m happy with the 25km speed limit ie I’m not a speed demon now, Bafang would most likely be better if you do want to go over that. I went with an aluminium frame for that bullshit orange pea gravel and limestone we have. You might want to check with the WA MTB group on FB if anyone has had damage from it with a carbon frame. I haven’t ridden off road with a carbon frame so couldn’t say what it does.

 

[Waynemarlow]

Bram, the Dengfu frames have been put through a lot of kms now by owners here on this forum, do you not think problems of reliability would be now well known ? Many of us ride in rock strewn and my case flint strewn tracks, carbon is not really a problem now a days in these situations. If you are worried then you also need to be worried with your Ali frame, Ali frames are now so thin from forming to save weight that there's little impact difference.

I did basically what you want to do, moved all my components over from an Mtb, it works well and saves you a lot of money. The resale of used mtbs is now virtually worthless such is the impact of modern Emtbs on their sales value. You can get a shim for your dropper post. But changing over is not a free lunch, there's always problems of incompatibilty of even components just of few years go, but the majority will just move straight over.

You may want to do some research but there are Apps which monitor heart rates and will set the assistance levels accordingly on your EBike.

 

[bram.biesiekierski]

Thanks for the reply guys.

Cemoz, I hope your heart health improves. I don't think I could live with a 25km speed limit haha.

Wayne, yes I think I might go with the Dengfu e22. I don't mean to make out that Perth is the only place with rock trails. I am just concerned. I want to buy a decent MTB, not a toy.

 

[bram.biesiekierski]

I am in discussion now with Melody at Denfu. About to order the frame, battery, and motor.

Can anyone confirm if there is any other electrical parts I will need to order? Does the motor come with all nessisary cables and electrics and such? Does it include a charger?

Is there anything I should order now, while I'm dealing with Dengfu?

Do the motors come with cranks and chain rings?

Sorry if these sound like rookie questions. I just don't want to be caught out later.

Thanks.

 

[Waynemarlow]

Depends on what motor kit you order. Melody is pretty good with understanding written English than writing English. If you just ask for a motor kit inc of cables to fully fitout the frame, she will normally get it right. You need to order a charger, it comes with crank and normally a 36T ring but its better with a 34T if you can. Order an additional rear derailleur hanger and 1 extra suspension bolt, they cost pennies but are not available outside of Dengfu.

 

[Waynemarlow]

And a front suspension head bearing set and specify a DP C241 rather than a DP240 which doesn't have BT capability. You may want to look at dispays as there are larger colour versions as well.

 

[Mitchb]

Another option if your current bike is in good shape is to buy the Bafang kit that converts it to an eBike.

 

[Mikerb]

If money is the problem I doubt you will save a great deal doing a DIY ebike compared to getting a good second hand EMTB and it would be a lot less hassle..........and probably end up being a far better bike. I dont know what the second hand market is like in your neck of the woods but here there are quite a few low mileage models bought during the lockdowns and now with no time ( or inclination) to ride. Sales of second hand EMTBs tends to be slow because people know they represent a risk unless there is still a good period of warranty left. That is not necessarilly a problem if you are a reasonably competent bike mechanic. One good deal currently for someone in your situation may be a 2020 Levo. 2 year old means lower purchase price but it still has 2 years motor warranty left due to the 4 years Spesh gave 2019 and 2020 bikes.

 

[bram.biesiekierski]

If money is the problem I doubt you will save a great deal doing a DIY ebike compared to getting a good second hand EMTB and it would be a lot less hassle..........and probably end up being a far better bike. I dont know what the second hand market is like in your neck of the woods but here there are quite a few low mileage models bought during the lockdowns and now with no time ( or inclination) to ride. Sales of second hand EMTBs tends to be slow because people know they represent a risk unless there is still a good period of warranty left. That is not necessarilly a problem if you are a reasonably competent bike mechanic. One good deal currently for someone in your situation may be a 2020 Levo. 2 year old means lower purchase price but it still has 2 years motor warranty left due to the 4 years Spesh gave 2019 and 2020 bikes.

Thats a good option. Although the SH bike market where I live is usually pretty hot. I know with buying and selling bikes in the past. Although not specifically an Ebike. The last bike I sold, I actually got the same that I paid for it new, after riding it pretty hard for a year. And my current bike I bought used, at a decent price. But that was via a friend of a friend. It was about 1k cheaper than same bikes being advertised elsewhere, which wasn't much cheaper than buying it new.

But it's not just having an ebike that is enjoyable. I get alot of enjoyment from building stuff. In the past I've built and raced targa rally cars. And I pretty much do everything on them, all mechanical work, fabricate roll cages, manifolds, exhausts etc, wire in ECUs, do engine builds. Pretty much do everything on the car except paint and tune the engine mapping. And that was thoroughly enjoyable process to build, as well as race. But if you think MTBs are expensive, race cars are some thing else haha. Can easy add an extra zero (or two if you want to be at the pointy end). Which is one of the reasons I'm looking to do a bike instead. I love riding, and I love building things and learning new skills. Buying something will get me on an e bike quicker, but I won't get the fun of doing it myself.

 

[bram.biesiekierski]

Another option if your current bike is in good shape is to buy the Bafang kit that converts it to an eBike.

I kinda want to try and keep my current bike just incase I want to do a shuttle day etc. If I can keep it mostly together. Ie, just swap wheels, shock, fork and bars back on, but keep rear brake, and mech set up. Then it is something I could do in a relatively short time. I think have enough parts that I can leave the rear half intact.

Later on, if I find that the Ebike is getting good use and I still want to use the MTB, I could look at getting parts like an extra fork, and shock, to keep both bikes complete.

 

[bram.biesiekierski]

And a front suspension head bearing set and specify a DP C241 rather than a DP240 which doesn't have BT capability. You may want to look at dispays as there are larger colour versions as well.

Ok. Ill check.

Is there a way to distinguish if its a 240 or 241 from pictures? Melody sent me a picture of the motor kit.

I have already asked for extra derailer hanger, and charger and battery bracket is apparently included with it. And headset and through axle bolt are also listed.

I will ask about shock bolts. Do you have measurements/picture of the shock bolts? I am already planning on using my Kitsuma Coil in the E22.

 

[Neeko DeVinchi]

Hi @bram.biesiekierski, not too sure if you've checked out the Dengfu E22 Frame thread but

Dengfu E22 Frame Thread

Decided to pick up one of these frames sets after receiving many enquiries through Instagram, EMTB Forums, EBR, etc. Hopefully, this thread will be of use to anyone who is considering buying/building up one. FULL DISCLAIMER It was through Carbon Cycles on Ebay which I picked one up for the...

www.emtbforums.com

As for your initial concerns regarding the reliability/durability of the frame, I can't answer that at this stage as I've only has mine for about 2 months. But its coped remarkably well (better than I anticipated).
In addition, support does exist in Australia for Bafang motors and products. You'll have to bare with me as I find suitable avenues for consideration. But rest assured, you will not be the first person in Australia to use a Bafang system .

As for your intention to repurpose your existing equipment onto the E22, this will work. But know that the geometry of the E22 is not like a Trek Remedy. I would invest in an angle headset for the E22 if you are looking to make it more slack & retain a good seat tube angle.
Works Components, Superstar Components & Wolf Tooth make angle headsets compatible with the E22 which is worth considering.

I wont bother asking 'which M620 motor variant you will receive?', as I imagine Bafang motors are still new to you. However if you encounter any problems or require any guideline, don't hesitate to reach out

 

[bram.biesiekierski]

Hi @bram.biesiekierski, not too sure if you've checked out the Dengfu E22 Frame thread but

Dengfu E22 Frame Thread

Decided to pick up one of these frames sets after receiving many enquiries through Instagram, EMTB Forums, EBR, etc. Hopefully, this thread will be of use to anyone who is considering buying/building up one. FULL DISCLAIMER It was through Carbon Cycles on Ebay which I picked one up for the...

www.emtbforums.com

As for your initial concerns regarding the reliability/durability of the frame, I can't answer that at this stage as I've only has mine for about 2 months. But its coped remarkably well (better than I anticipated).
In addition, support does exist in Australia for Bafang motors and products. You'll have to bare with me as I find suitable avenues for consideration. But rest assured, you will not be the first person in Australia to use a Bafang system .

As for your intention to repurpose your existing equipment onto the E22, this will work. But know that the geometry of the E22 is not like a Trek Remedy. I would invest in an angle headset for the E22 if you are looking to make it more slack & retain a good seat tube angle.
Works Components, Superstar Components & Wolf Tooth make angle headsets compatible with the E22 which is worth considering.

I wont bother asking 'which M620 motor variant you will receive?', as I imagine Bafang motors are still new to you. However if you encounter any problems or require any guideline, don't hesitate to reach out

Hi. Yes I did have a bit of a browse through your thread. It's a good looking frame. I actually just pulled the pin and ordered a frame, battery and motor. So I guess I shall see how that goes.

Yes, the geo is slightly different than the remedy. I opted for a 20" frame E22, and my Remedy is a 19.5". I was tossing up between the 18" and the 20" E22, but settled on on 20". The 20" E22 has only slightly more reach, but quite a bit of stack increase. Which should still fit me well enough. If the extra stack is a bit much, I could look at flatter bars. Remedy currently has 20 or 25mm rise I think. Although, as said, if I can avoid buying parts I will.

The E22 also has a less steep seat tube angle. Which will give more room to work in. On my remedy, I have the seat as far back on the seat rails as it goes. If I put it forwards on the e22, then that should get it back close to what the remedy is set at. So that shouldn't affect my seated pedalling position too much.

The rear chain stays are longer on the E22. But I suspect this is probably due to having a big whopping motor where the bottom bracket usually goes. Plus the E22 says it can go up to a 29x2.3 rear tyre. The Remedy is a 27.5 bike, but interestingly you can drop a 29 (by 2.4" I think) rear tyre in without fouling.

The E22 20" will be a longer bike overall, which should make it better for speed stability, at the sake of some cornering agility/manoverabilty. Plus the added weight of an ebike I will imagine have a similar effect.

The head angles are actually very similar when compared to the Remedy in its "high" setting. Which is what I have it set at, as I have increased the travel slightly by over stroking the shock.

As you mention, I could slacken it with angled headset if the need arises. Bit I will probably run it as is. And perhaps later down the road. Put a 170mm 29" fork and 29" front wheel. That is something I had actually wanted to do with the remedy but never got around to.

BB height is a bit lower, so I will be sitting down lower in the frame. That is probably related to the E22 being based for 29". Running 27.5 with the Ebike, I might look at shorter cranks later aswell if ground clearance is an issue. I went from 175 to 170 on the remedy, and that was a great improvement for pedalling comfort, and made a noticeable difference with pedal ground clearance when pedalling through chop. I wish I had of gone even shorter than 170mm in hindsight.

Does anyone know what length cranks are included in the Bafang ultra kit?

This is all theoretical at this stage, and I guess I won't know how it all feels until I've got it set up and rolling. But I think it should be fine for my riding.

 

[bram.biesiekierski]

Hi @bram.biesiekierski, not too sure if you've checked out the Dengfu E22 Frame thread but

Dengfu E22 Frame Thread

Decided to pick up one of these frames sets after receiving many enquiries through Instagram, EMTB Forums, EBR, etc. Hopefully, this thread will be of use to anyone who is considering buying/building up one. FULL DISCLAIMER It was through Carbon Cycles on Ebay which I picked one up for the...

www.emtbforums.com

As for your initial concerns regarding the reliability/durability of the frame, I can't answer that at this stage as I've only has mine for about 2 months. But its coped remarkably well (better than I anticipated).
In addition, support does exist in Australia for Bafang motors and products. You'll have to bare with me as I find suitable avenues for consideration. But rest assured, you will not be the first person in Australia to use a Bafang system .

As for your intention to repurpose your existing equipment onto the E22, this will work. But know that the geometry of the E22 is not like a Trek Remedy. I would invest in an angle headset for the E22 if you are looking to make it more slack & retain a good seat tube angle.
Works Components, Superstar Components & Wolf Tooth make angle headsets compatible with the E22 which is worth considering.

I wont bother asking 'which M620 motor variant you will receive?', as I imagine Bafang motors are still new to you. However if you encounter any problems or require any guideline, don't hesitate to reach out

As for which motor. I have no idea. It is supplied by DENGFU with the frame and battery.

Melody did send me a picture of the kit, and stated which display is supplied (dpc18). Although I have no idea if the picture is just a stock picture, or the actual spec that will be supplied.

 

[Neeko DeVinchi]

As for which motor. I have no idea. It is supplied by DENGFU with the frame and battery.

Melody did send me a picture of the kit, and stated which display is supplied (dpc18). Although I have no idea if the picture is just a stock picture, or the actual spec that will be supplied.

All M620 motor kits come supplied with 170 ISIS cranks. You can buy aftermarket cranks which are shorter such as Raceface Aeffect, Maranda, FSA etc.
The DCP18 display is a stock display with the M620 kit (center mounted) for 31.6 bars. In addition, the stock chainring included will be 44t. I would recommend swapping to a smaller chainring. That way, you can give the motor a mechanical advantage to be more efficient.

Otherthan that, it is simply plug-n-play. So you shouldn't struggle setting it up.

Keep a watchful eye on the E22 thread as I'll update it as much as I can with further tidbits of information and don't hesitate to reach out

 

[bram.biesiekierski]

All M620 motor kits come supplied with 170 ISIS cranks. You can buy aftermarket cranks which are shorter such as Raceface Aeffect, Maranda, FSA etc.
The DCP18 display is a stock display with the M620 kit (center mounted) for 31.6 bars. In addition, the stock chainring included will be 44t. I would recommend swapping to a smaller chainring. That way, you can give the motor a mechanical advantage to be more efficient.

Otherthan that, it is simply plug-n-play. So you shouldn't struggle setting it up.

Keep a watchful eye on the E22 thread as I'll update it as much as I can with further tidbits of information and don't hesitate to reach out

Ok 170mm cranks should be fine. No need to upgrade them for now.

44t chainring sounds quite large. I'm used to riding a 32t, but without motor.

I have a choice of a 9-50, 10-50, and 10-52 Eagle rear cogs. And with 44t, that would push the ratios way too high for alot of what I do. But would be great for top end on smooth pavement. I will look for something smaller.

Is there a particular offset or anything that I need to find?

 

[Kiteboy]

I have the Dengfu E06 and have had a reasonably good look around at the inside of the frame (dropped motor, removed forks, battery case, etc..) I have also worked a lot with carbon epoxy, as being in ocean sports most of my life, I ended up doing all of my own repairs, (you know - if you want it done right...) so I'm familiar with carbon fiber and what kind of punishment it will take. I have no reservations about hammering difficult trails on the E06 frame.

I would take care of nicks right away though. A little prep then epoxy resin if you penetrate to any degree would be advisable. A little chopped up carbon in the mix if a really bad nick.

Two part epoxy pump kits from most marine supply stores will deliver the exact ratio (critical for epoxy resin mix) for any size job you need and Bob's your uncle.

Otherwise it looks like I could take on most Moab trails with the bike and never worry about the frame holding up.

 

[bram.biesiekierski]

I have the Dengfu E06 and have had a reasonably good look around at the inside of the frame (dropped motor, removed forks, battery case, etc..) I have also worked a lot with carbon epoxy, as being in ocean sports most of my life, I ended up doing all of my own repairs, (you know - if you want it done right...) so I'm familiar with carbon fiber and what kind of punishment it will take. I have no reservations about hammering difficult trails on the E06 frame.

I would take care of nicks right away though. A little prep then epoxy resin if you penetrate to any degree would be advisable. A little chopped up carbon in the mix if a really bad nick.

Two part epoxy pump kits from most marine supply stores will deliver the exact ratio (critical for epoxy resin mix) for any size job you need and Bob's your uncle.

Otherwise it looks like I could take on most Moab trails with the bike and never worry about the frame holding up.

Thats reassessing to hear your happy with your E06. But a little concerning about having to patch it with epoxy if it gets nicks haha.

 

[bram.biesiekierski]

All M620 motor kits come supplied with 170 ISIS cranks. You can buy aftermarket cranks which are shorter such as Raceface Aeffect, Maranda, FSA etc.
The DCP18 display is a stock display with the M620 kit (center mounted) for 31.6 bars. In addition, the stock chainring included will be 44t. I would recommend swapping to a smaller chainring. That way, you can give the motor a mechanical advantage to be more efficient.

Otherthan that, it is simply plug-n-play. So you shouldn't struggle setting it up.

Keep a watchful eye on the E22 thread as I'll update it as much as I can with further tidbits of information and don't hesitate to reach out

Hey Neeko. Can you confirm the dropprt / seat post diameter? I'm pretty sure that is one area of the E22 that won't swap over from the remedy.

 

[Neeko DeVinchi]

Hey Neeko. Can you confirm the dropprt / seat post diameter? I'm pretty sure that is one area of the E22 that won't swap over from the remedy.

Its 31.6. You could run a shim if your variant of the Trek Remedy is using a 30.9.
If its running a 34.9, yes you'll need a new one. But droppers are fairly easy to source.

I use a one up dropper 210 in my large which is slammed. But other brands like Bikeyoke, Fox, Rockshox, Brand x/Trans x are notable choices

 

[bram.biesiekierski]

O

Its 31.6. You could run a shim if your variant of the Trek Remedy is using a 30.9.
If its running a 34.9, yes you'll need a new one. But droppers are fairly easy to source.

I use a one up dropper 210 in my large which is slammed. But other brands like Bikeyoke, Fox, Rockshox, Brand x/Trans x are notable choices

Awesome 31.6 is the same as the Remedy. I thought the E22 was 30.9 for some reason.

That should just swap right in then. I have a one up 180mm.

 

[bram.biesiekierski]

Another question. How do you find the rear suspension progression curve? Is it relatively linear or is it ramp up. I'm asking specifically about the frame, not what is dialed in via airshock, and tokens etc.

I ask because I will be running a coil, which don't have the same inherent progression as air shocks.

Some frames are designed with a relatively linear leveridge ratio through the travel, and are intended for airshock use, gaining additional progression via tokens etc. While other frames have more inherent progression built into the rear linkage action. Meaning they tolerate coils much better. I want to know roughly where about this E22 frame sits with regards to progression.

I dont need much progression. It's not like I send massive jumps often, and need that deep travel progression to prevent blowing through all the travel. I more prefer the feel of a coil. They don't have the same "stiction" as air shocks and I feel it's a much nicer/smoother (and faster) ride. It was probably the best upgrade I did with the Remedy. But at the same time, I don't want to be eating up all the travel and having to go stuffer coils or use excessive damping to compensate.

 

[Neeko DeVinchi]

Apologies for the delay @bram.biesiekierski.

I am on the verge of obtaining this information in terms of suspension kinematics, leverage curve, anti-squat figures etc for both the E22 and E10.

This has taken longer than i anticipated as I have opted to seek a second opinion in terms of my initial findings and data which was provided to me.

I'll update the E22 frame thread with this information but ultimately, this should answer the question of whether the E22 is optimised for coil shocks

 

[thaeber]

Another question. How do you find the rear suspension progression curve? Is it relatively linear or is it ramp up. I'm asking specifically about the frame, not what is dialed in via airshock, and tokens etc.

I ask because I will be running a coil, which don't have the same inherent progression as air shocks.
This is the leverage ratio chart for the E10.
Some frames are designed with a relatively linear leveridge ratio through the travel, and are intended for airshock use, gaining additional progression via tokens etc. While other frames have more inherent progression built into the rear linkage action. Meaning they tolerate coils much better. I want to know roughly where about this E22 frame sits with regards to progression.

I dont need much progression. It's not like I send massive jumps often, and need that deep travel progression to prevent blowing through all the travel. I more prefer the feel of a coil. They don't have the same "stiction" as air shocks and I feel it's a much nicer/smoother (and faster) ride. It was probably the best upgrade I did with the Remedy. But at the same time, I don't want to be eating up all the travel and having to go stuffer coils or use excessive damping to compensate.

 

[thaeber]

This is the leverage ratio chart for the E10 out of Robs initial „The Cheeb“ post. Shows some slight progression towards end of stroke. I run a progressive spring additionally. Works great!

 

[bram.biesiekierski]

thanks.

Starting at 3:1 and getting up to about 2.6:1 at max travel.

That's pretty similar to the remedy, which starts at about 3:1 and gets up to about 2.5:1 E10 has a little less progression, but overall quite similar curve to the remedy. (Blue line in the graph)

it will be interesting to see the E22 graph.

 

[bram.biesiekierski]

Hi. Can anyone confirm if this 104 bcd spider and chain ring is a match for the m620, with boost 148 rear end?

 

[Neeko DeVinchi]

The Christini chainring is compatible with the M620 motor which changes the bcd from 130 - 104.
The spider from the M420 is also compatible with the M620 motor but you'll need to run bottom bracket spacers to inch it out to get the right chain line.
The chainring from either the m500/m600 is not compatible with the M620.

Hope this helps @bram.biesiekierski