e750d Gravel bike

Mabman

E*POWAH Elite World Champion
Feb 28, 2018
1,122
1,851
Oregon USA
This has been a long time in the shed as I was really close to getting it going 2/'20 and then all hell broke loose. In the meantime I was mainly riding my eMTB and then fall '21 I got an E22 M620 bike and it got put further back on the to do list. That bike is down for awhile due to a controller issue and so I found myself without a bike to ride because I had given my kid my spare eMTB. While doing some organizing and consolodating/getting rid of stuff today I came across enough parts and pieces that I figured I could make it work.

e750d.jpg


I have built two other bikes of a similar design using a front hub motor and throttle with no PAS but a cruise control feature that allows me to set and forget at any watt output I choose up to 1000w but mostly I ride in the 350w zone. Without any PAS the pedal feel through the Schlumpf High Speed drive and 11 speed feels very natural because you can choose to be in any gear you want while the motor pulls consistently. Kind of like a row boat with a trolling motor is the best way to describe it. Doesn't work well for eMTB but the hybrid method works well on the road where cadences tend to be higher. With the Schlumpf it has like a 160" gear so pedal imput remains viable up to the mid 30's.

Bike is one an industry friend was experimenting with the idea of that uses a 750mm diameter rim that with the 40c tires measures at 29.5" diameter. He had a very small batch of the parts, frame, fork, rims and tires made in Taiwan and handed them out but Covid has put at this point a permanent stall to the project as well as he has pretty much gone into retirement. I have ridden the bike unpowered in the past and it did great on flattish stuff but not a good hill climber but with the power of e that has changed.

My original plan for this bike was to have the battery/controller in a top tube bag so nicely hidden from view. The old 48v Dolphin battery that I found the mounting plate for today and was the main impetus for starting the project will get me going as well as the bulky controller but will inspire me to fix it up the way I intended I hope. I am thinking I can use my E22 battery and just make a +/- cable with some Andersons that will slot into its hot end which will be a better setup and will probably do that first because the controller I want is out of stock and has been for awhile.

Gravel bikes are a close cousin to eMTB I feel. In the past I have done dirt rides from sea level to 10k on bikes like this it is just a different experience.

Won't take the place of my E22 bike but still should be able to do gravel as long as it isn't too chunky and B roads like we have here. I rode my other bikes around here alot in the past anyway just gotta be careful of flats......
 

Mabman

E*POWAH Elite World Champion
Feb 28, 2018
1,122
1,851
Oregon USA
So according to the above, embarassingly, this bike has been on the shelf for 3yrs for the most part. After that picture was taken with the early adopter GRIN Any Axle that turned out to have been ill treated, by me, and only ran for a few hundred miles before it gave up the ghost after I had put 3 thousand miles with it on another bike. So back it went on the shelf.

Sick of looking at it languishing I decided to get the final version of the motor as well as a base runner controller. Built the wheel and sourced a 52v, 910wh, 2700 cell blue shrink battery and it fits nicely in the tt bag as I envisioned above , from Oveja Negra I highly recommend their bags, as well as the base runner controller keeping all that crap nicely out of sight. Tossed on a couple of KingCages now that the brazeons are freed up. Although the battery weight is on the tt handling is fine, bike is like 42lbs. with a steel frame.

Still don't know how much I'll ride it and then mostly on gravel to avoid traffic. Just too used to hopping on the mtb and being able to monster truck anywhere.....plus, well, rigid......

EAR driveside.jpg


EAR Non-drive:dropper.jpg
 

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