The BBB Bosch E-Bike Sprocket BCR-70E is a replacement chainring for all Bosch GEN2 E-Bike systems, giving you the capability to replace or change the gearing ratios on your Bosch equipped E-Bike. The lock ring is included and it allows an optional chainline offset of 2.5mm for Boost 148mm, as well as being compatible with standard 135/142mm frames.
Customize your Bosch Gear Ratios
A perfect upgrade if you find yourself running out of gears while going downhill, or if you find yourself using the smaller sprockets on your cassette often. A high-quality manufacturing and hardening process ensures the BBB Bosch E-Bike Sprocket BCR-70E is extremely wear-resistant and more durable than the original Bosch chainring.
BBB Bosch E-Bike Sprocket BCR-70E Specifications
14,15,16,17,18,19 & 20 tooth options
Compatible with Bosch systems.
Hardened steel for longer durability.
Optional chainline offset of 2.5mm for Boost 148mm.
Lock ring included.
Compatible with: single, 8, 9, 10, and 11-speed.
E-bike specific: This product complies with the NEN-EN 15194:2017 regulations for e-bikes.
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Q: I have an FSA chainring (WA-133-1) which is 15 tooth. Is this a direct replacement? I see that only a 14 or 16 tooth is available. No 15, but what difference would a 14t or 16t make? And will it work?
A: Hello. You can easily change between 14, 15 and 16 teeth. If you go down a tooth (14) it would be better for hill climbing and if you go up a tooth (16) will be better suited for normal riding in the 20-32 Kph ranges
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A: I purposely substituted a 20T for an 18T because a variation of my bike model was spec’d with it and I wanted to improve the upper pedal speed of my bike. At the the same time it helped me distribute the wear on my rear cassette by changing the tendency to always ride in gear two.
I suspect in your case you would change the characteristic of your bike slightly with a one tooth difference given that it was otherwise compatible. You might find your chain length also needs to change by a link, next time you swap it out.