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Bosch CX 2019 internal gear inches

Old 10-18-21, 10:24 PM
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MarcusT
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Bosch CX 2019 internal gear inches

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
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Old 10-18-21, 10:40 PM
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AIR, the Schlumpf drive ratio was 2.5 to 1, so your 14T is effectively 35. Never figured out why Bosch incorporated that system.
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Old 10-18-21, 10:44 PM
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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

Last edited by MarcusT; 10-18-21 at 10:49 PM.
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Old 10-19-21, 08:55 AM
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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.

Last edited by 2old; 10-19-21 at 09:12 AM.
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Old 10-21-21, 10:10 PM
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Originally Posted by 2old View Post
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.
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
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