Про переключатель пишут "Compatible with Shimano 8 and 9-speed mountain and road systems"
Про шимановские "Rear shift ratio is 1.7, that is for 1 mm of cable pull/release, RD is moved left/right by 1.7 mm. All these RDs are compatible and any 6 to 9 speed RD will work perfectly with either 6, 7, 8 or 9 speed shifter."
Про цепь и переключатель "Since all the multi speed chains have the same inner (roller) width, special pulley design won’t know what kind of chain goes over the pulley wheels. As for cage width, differences aren’t enough to cause problems. Especially from 10 to 8 speeds. For example: 8 speed chains work perfectly fine with 10 speed derailleurs."
Какая внутренняя ширина у цепей на 8 и 9?
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