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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 03-11-09, 04:54 AM   #1
knucklesandwich
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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?

Thanks.
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Old 03-11-09, 11:44 AM   #2
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The rear der. needs to be a little outside of the smallest cog. If it sits directly under the cog you can have shifting problems. Use the high limit screw to set it.
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Old 03-11-09, 12:32 PM   #3
frankenmike 
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The rear derailer just need to be readjusted to fit the new wheel, including limits and cable.
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Old 03-11-09, 03:34 PM   #4
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Is the smallest cog an 11? If so it needs to have the special lockring for an 11. An 11 with a standard lockring will cause the chain to skip.

Al
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Old 03-11-09, 04:58 PM   #5
Gonzo Bob
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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.
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Old 03-12-09, 04:56 AM   #6
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Thanks for all replies- I think I've almost got it.
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