The 9-speed chainring release teeth and pick-up teeth are reprofiled for narrower chains, therefore you can not use an 8-speed chain, and the pick-up teeth will make noise against the chain during minor cross chaining.

• 9速齿盘的“释放齿”与“捡拾齿”是针对更窄的链条进行设计的，因此不能使用8速链条与其搭配，“捡拾齿”会在“较小交叉档位”与链条摩擦产生噪音。