The pulley wheels from KCNC are made for Shimano Ultegra 6800, 6870, Dura Ace 9000 and 9070.
Instead of the standard 11tooth pulley wheels, here is a solution with 14 teeth on the top wheel and 16 teeth on the bottom.
Both balls and ball path in the bearings are ceramic, so the friction can be minimized as much as possible.
The idea behind the larger bearings is that the friction and wear is not as great, as the wheel does not have to turn around as many times, compared to the smaller pulley wheel.
Compared to the smaller pulley wheels with regular closed bearings, there is a saving of 3 watts.
The arm itself is simply replaced with the normal one you have and it is a short arm so it can take up to 28 teeth on the cassette.
The pulley wheels from KCNC are made for Shimano Ultegra 6800, 6870, Dura Ace 9000 and 9070.
Instead of the standard 11tooth pulley wheels, here is a solution with 14 teeth on the top wheel and 16 teeth on the bottom.
Both balls and ball path in the bearings are ceramic, so the friction can be minimized as much as possible.
The idea behind the larger bearings is that the friction and wear is not as great, as the wheel does not have to turn around as many times, compared to the smaller pulley wheel.
Compared to the smaller pulley wheels with regular closed bearings, there is a saving of 3 watts.
The arm itself is simply replaced with the normal one you have and it is a short arm so it can take up to 28 teeth on the cassette.
KCNC Ceramic Oversize Pulley Wheel System
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