MarcusT

I am attempting to calculate the gear inches for my Emtb with a Bosch CX 2019.
Obviously, it is not the 14 tooth chain ring installed. Does anyone know what the equivalent is for an actual chain ring? (24T, 34T, etc)

Thanks

2old

AIR, the Schlumpf drive ratio was 2.5 to 1, so your 14T is effectively 35. Never figured out why Bosch incorporated that system.

MarcusT

Thank you.
The gearing is too high for me and want to see what I can bring it down to.
35x42 is mine. The newer models have a 38x51
24.64 vs 22.57

2old

I looked at scooteretti for Bosch e-bike gears by Connex, and looks like 14 is the smallest (probably don't want to go smaller anyway since wear will increase). Probably your cassette is 11-speed (11-42); a change to 11-46 would provide almost same low as the newer models if your rear derailleur is compatible. Highly rated 11-46 on Amazon for < $60.

MarcusT

My bad, the chainring is actually 15T, (1x10) equivalent to 37.5 or 38T. The RD is limited to 42. I'll switch to a 1x11 system and get a 11-51T. Which is what was offered on the more expensive versions of my bike. It's an investment, but should not be in vain