smorgasbord
Well-Known Member
- Region
- USA
Box's Prime 9 is a really interesting concept: Use the 12-speed dimension for the inside of the chain and the 9-speed dimension for the outside of the chain. This means the rear cog has plates that are as thin as 12-speed cogs, but they're spaced further apart. The front chainring can be any standard 12 speed chainring (narrow-wide). If they use the right materials, their chains could be very durable since the side plates are thicker.
Note that you give up shifting more than 1 cog at a time, but with 9 speeds instead of 12 you may not need to do that as often (although cresting a hill or going through a valley often require big gear changes no matter what).
I don't understand their claims about adjustment frequency, etc. My 12-speed SRAM doesn't need adjustment any more than my old 8-speed or 10-speed drivetrains - maybe even less since it's a higher quality system than I had on those bikes.
Note that the e-bike specific version of the Box Prime doesn't go down to an 11 tooth cog, just 12. They say it's for wear purposes.
Note that you give up shifting more than 1 cog at a time, but with 9 speeds instead of 12 you may not need to do that as often (although cresting a hill or going through a valley often require big gear changes no matter what).
I don't understand their claims about adjustment frequency, etc. My 12-speed SRAM doesn't need adjustment any more than my old 8-speed or 10-speed drivetrains - maybe even less since it's a higher quality system than I had on those bikes.
Note that the e-bike specific version of the Box Prime doesn't go down to an 11 tooth cog, just 12. They say it's for wear purposes.
