help with a knock/slipping in smallest cassette cog
Last night I decided to swap wheelsets between my 2 bikes- one with 8speed Sora and the other with 10speed Rival. So I pulled the cassettes off and carefully reinstalled them on the other wheel- the 10spd cassette is now on Mavic Aksiums, with a spacer put on before the cassette.
When I put it on the bike and turn the pedals, all seems fine until the bottom(smallest) cog which skips horrendously, roughly twice per crank revolution. The r/d appears to be aligned all the way up and down the cassette so I'm unsure about what the problem is- does anyone have any suggestions?
Also check whether the spacer is needed. Some 10-speed cassettes need a spacer to fit on some 8/9-speed wheels. Some don't. If you have too many spacers on there, the top cog may not engage enough of the freehub splines and could slip.