Yes, Hanger is straight. I adjusted the Derailleur and checked chain length as described at Shimano: https://si.shimano.com/api/publish/storage/pdf/en/dm/MARD001/DM-MARD001-03-ENG.pdfHanger straight?
Ive had this to on my xt 11 speed setup, as soon when i ride a couple hundred kms i get this skipping in lowerst gear. I was changing the smallest sprockets in less then 500 km.Yes, Hanger is straight. I adjusted the Derailleur and checked chain length as described at Shimano: https://si.shimano.com/api/publish/storage/pdf/en/dm/MARD001/DM-MARD001-03-ENG.pdf
Shifting works well, it's just chain slipping under load on 10t and 12t. all other cogs are fine.
Under load on the gears 11 (12t cog) and 12 (10t cog) the chain will slip or skip a tooth every once in a while.Sorry, I'm not up on the terminology. What does the chain skipping or slipping mean?
In my case, it's not about changing cogs, it's skips staying on the same cog. It's not an alignment issue.Basically means the chain not staying on the cog its supposed to be on, and skipping/slipping between cogs without you changing gear
SRAM do an 8-speed one called the EX1 I believe. It gives you all you ask for, at a price.........................A true solution imo would be a emtb specific 9 speed system. Wider chain and cogs, more resistant to high torque, less wear, less chain stretch etc. And perhaps we need derailleurs that provide higher chain tension?
Yeah its becoming a big problem i think.
You can get a SLX cassette for around €80 - €90 which is the cheaper option compared to the XT.
The 10 and 12 cogs can be bought as a set for around €25 (XTR only) as you mentioned, all sold out...
The 14, 16 and 18 you can get in SLX / XT quality (they seem to be identical?) for around €3,- each.
(Is there actually a difference in XTR, XT and SLX for the small cogs?)
But that sadly still wouldnt solve the problem for many that have these gears fail after a couple of hundred kms.
IMO this problem could be aggravated by low chain tension. Perhaps some of the unlucky ones just have a derailleur with less tensioning force. It is expected that there is variation in spring tension inside the derailleur as a result from the manufacturing process. So someone with a less springy derailleur could experience skipping sooner. Other factors would be riding weight (the amount of force applied to the pedals) and motor torque (i guess my weaker E8000 is at an advantage here, lol).
But obviously the primary problem is just that the mechanism is pushed too far to its limits.
A true solution imo would be a emtb specific 9 speed system. Wider chain and cogs, more resistant to high torque, less wear, less chain stretch etc. And perhaps we need derailleurs that provide higher chain tension?
SRAM do an 8-speed one called the EX1 I believe. It gives you all you ask for, at a price.
Personally I don't like it as I could never find a gear I liked, I always seem to be in the wrong one.
SRAM EX1 Review: 8-gear drivetrain for E-MTBs
We've tested the first dedicated E-MTB drivetrain, the SRAM EX1, on various bikes over the past few weeks. Here's what we think.ebike-mtb.com
I run this drive train on my emtb (tuned bosch gen2). The retail price of the cassette is at 490€ i believe, but you can get it way cheaper in germany ( paid 310 for cassette and chain).I think I will aim for a new SLX cassette with a new chain, service the derailleur and lets see how long it takes before it wears out.
How many cogs where you running front ? Gen4?
Well, only the cassette goes for like 400 euro. Tuning the motor for the new gear ratios...lot of hassle.
The system was released 2016. Its 2021, time for more new strong systems
As said, a 9/10 speed with the last gear having 11cogs at least.
I run this drive train on my emtb (tuned bosch gen2). The retail price of the cassette is at 490€ i believe, but you can get it way cheaper in germany ( paid 310 for cassette and chain).
Ive had a 20t chainring upfront that was good for speeds at 50-60km/h but i later switched to a 18t cuz the chainring was to expensive (around 95€) to replace.
The only difference is the front chainring, im sure there are narrow wide chainrings out there for gen 4.I usually order my bike parts from Germany.
It would awesome tho, for my scott egenius 730. But never had any problems with the 11speed NX drivetrain there.
The system was designed for gen 2 bosch etc, haven´t sourced out someone with the gen4 yet to give us feedback. So risky spending that amount of money for trial and error. It´s starting to get warmer here soon again, and want to have the ride ready for action.
For gen 4 you have 36/38T chainrings. 38 being the most common, I even found a 42T one.
SRAM do an 8-speed one called the EX1 I believe. It gives you all you ask for, at a price.
Personally I don't like it as I could never find a gear I liked, I always seem to be in the wrong one.
SRAM EX1 Review: 8-gear drivetrain for E-MTBs
We've tested the first dedicated E-MTB drivetrain, the SRAM EX1, on various bikes over the past few weeks. Here's what we think.ebike-mtb.com
Others will know for sure, but I had believed that the need for a stronger chain started with a wider one and that meant 8-speed. They could have gone 9-speed, but the chain would have had to be narrower and therefore weaker. The range is 11-48 (436%) which is surely wide enough for most riders. But I just could not get on with the big gaps.Agree with that.
I do find it odd though, that after developing an e-mtb specific 8 speed (only need 8 as it's an e-bike apparently) drivechain that the most common drivechain fitted to e-mtb's now is a 12 speed...
I believe the ex1 chain is 10 speed. It also uses a 10 speed powerlockOthers will know for sure, but I had believed that the need for a stronger chain started with a wider one and that meant 8-speed. They could have gone 9-speed, but the chain would have had to be narrower and therefore weaker. The range is 11-48 (436%) which is surely wide enough for most riders. But I just could not get on with the big gaps.
An 8-speed chain has 7 gaps, and on that range implies an average shift of 23%.
My 11-46T 11-speed has an average shift of 15%, which is pretty much the standard shift % (for mtbs at least). That may seem a small difference, but it's an average 50% bigger shift each time. I only tried an EX1 for a hour or so and I may have got used to it, but it felt so so uncomfortable that it may have taken some time. It reduced my enjoyment of the bike.
Even the 10-50T 12-speed has an average shift of just under 16%.
Ahh, I have never heard or read that before. How fascinating! I thought that someone would know more about this for sure. It being an 8-speed transmission, I had assumed it was an actual 8-speed chain.I believe the ex1 chain is 10 speed. It also uses a 10 speed powerlock
Others will know for sure, but I had believed that the need for a stronger chain started with a wider one and that meant 8-speed. They could have gone 9-speed, but the chain would have had to be narrower and therefore weaker. The range is 11-48 (436%) which is surely wide enough for most riders. But I just could not get on with the big gaps.
An 8-speed chain has 7 gaps, and on that range implies an average shift of 23%.
My 11-46T 11-speed has an average shift of 15%, which is pretty much the standard shift % (for mtbs at least). That may seem a small difference, but it's an average 50% bigger shift each time. I only tried an EX1 for a hour or so and I may have got used to it, but it felt so so uncomfortable that it may have taken some time. It reduced my enjoyment of the bike.
Even the 10-50T 12-speed has an average shift of just under 16%.
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