Smallest chainring for Bosch Gen 3

[DennisAl]

New to the Ebike experience (knee osteoarthritis the reason) and have acquired a Cannondale Canvas Neo 2. Currently it has a 38t chainring. Looking online I see there is a 32t available. Is that the smallest for this motor?

Also is there any reason not to change to a 11-42 cassette from the current 9 speed one with 36t top?

Any advice gratefully received.

 

[soundwave]

looks like 32 is a small as they go but you could put a bigger cassette on it i have 10-50 on rear eagle 12spd

 

[DennisAl]

Thanks for the useful info soundwave. Will purchase the 32t chainring. But want to stick to 9 speed for economic reasons. I see that there is a 11-46 Shimano Cues 9 speed cassette, so will go for that.

I come from a background of unassisted cycling with 20/30/42 triple and 11-36. So the changeover to electric cycling in hilly South Wales will take some getting used to

 

[matthewslack]

If you want a lower bottom gear it is better to do the job properly with cassette, derailleur, shifter and chain that are designed to work together than to just swap cassette.

I tried an 11-42 9 speed with one of those funny little derailleur mount extensions and it was crap. Shifting was poor and the non-Shimano cassette was about as hard as bad cheese.

I have ended up with Shimano 11-51 11 speed M5100, shopping around to keep the cost down, which keeps the same top gear but has 40% lower bottom gear. Also, excellent shifting performance that never needs adjustment, unlike the old 9 speed that was fussy as hell.

If I was starting from scratch now I would also consider Shimano Cues, which has wide range cassettes in 9, 10 and 11 speed, and is specifically designed for longer life on mid-drive ebikes.

RRPs are similar, but so far more discounts turn up on M5100.

 

[soundwave]

SRAM Nx 11 Speed Group Set | eBay

NX is SRAM's 1x drive train for the masses. All the key functionality features of high end 1x derailleurs are built in. SRAM NX 11 Speed Rear Trigger Shifter Black. SRAM rear derailleur. Be part of the change.

www.ebay.co.uk

i have a 53t front ring and electric gears



got new one now and leg as well