Richard Berg wrote:
Do you mean 13T? The CSM680 specs shows cogs of 11-13-15-18-22-28-34-40T.
Either way, it looks like a very promising cassette. Inexpensive, plenty of range, pure steel, and easy to mod. I'm all about having fewer speeds! Less time wasted shifting -- especially since the GearSensor does not handle double-shifts very well.
Plus you get to use 7/8 speed chains, which are wider (stronger) -- 3/32” vs 11/128” for denser cassettes. KMC does not make an ebike-specific 7/8spd chain, sadly, but they assured me the X8-EPT was comparable in strength to the X10e series, not to mention way cheaper.
14t. from another cassette. you might notice the difference in color
well there are 3 ways to make a stronger chain: 1) better metallurgy 2) thicker plates 3) stronger rivets
8spd chain don't have those 3
anecdotally i find it much easier to push out 8spd pins w/ a chain tool than the higher speed chains
you could make a 1-inch wide chain but if the plates aren't any thicker then the chain wouldn't be stronger
but 8spd has wider cog-to-cog spacing so is more forgiving, so it tends to shift better. and the chains are super cheap. so even my 100% human powered bike is on an 8spd system w/ one cog removed: