Switching from an 11-speed drivetrain to a 12-speed one meant replacing the 11-46 cassette with the 11-51 cassette. This changes the slowest gear ratio from 46/30=1.5333... to 51/30=1.7 when using the stock 30T chainring. This is too slow for my purposes. Therefore, I wanted to replace the chainring.
While the stock FSA Comet MegaTooth 30T chainring can be replaced, finding a replacement is difficult for me because of its rare FSA direct mount.
A solution I chose is to replace the crankset with the Shimano FC-M7100-1 (Hollowtech II, SLX), 175mm option.
The chainring is 32T (51/32=1.59375) because I am unsure if there is enough space for a 34T (51/34=1.5) near the right chainstay of the Cujo 1.
This also means that I can use Shimano's 12-speed chains, which have a different shape.
The crankset and 32T chainring together weigh 635g.
See also related notes:
- SunRace CSM901 WA1 12-speed 11-51T cassette (2025-10-25)
- Shimano RD-M8100-SGS (Deore XT): 12-speed rear derailleur (2025-10-17)
- Кассета SunRace CSMX8 11-46T (2019-03-15)
- Cannondale Cujo 1 (2018): компоненты и спецификация (2018-10-14)
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