Join Date: Jul 2005
Bikes: 1984 Trek 520; 1990s Peugeot (Canadian-made) rigid mountain bike; 2007 Bike Friday NWT; misc others
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Your chain is skipping. Rising up off the rear cogs and jumping forward. Cause include using the small front chain ring with the smallest back one, worn cogs, and stretched chain. If you are using a small front ring, you can exert a lot of tension on the chain, and if you use a small rear cog, there aren't enough teeth to share the load, especially if they're worn. Also the "cross chaining" may increase the chance of this happening since the chain gets pulled sideways off the rear cog.
You may be able to avoid the problem by not using small/small combos.
Last edited by cooker; 08-13-06 at 01:27 PM.