Bicycle Mechanics - Chain slap
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How can I reduce chain slap. I have a full suspension KHS,RD works fine but seems to have excessive chain slap when suspension compresses.Clues?
03-22-11, 05:23 PM
Run the shortest chain length possible using Sheldon Brown's Big/Big + 1" method: http://www.sheldonbrown.com/derailer-adjustment.html#chain (when doing so, make sure suspension is in the position where the effective chainstay length is at its max).
Chain slap is commonplace, especially when off-roading, so you should accept it and get a guard to minimize the noise and protect the paint.
03-22-11, 05:49 PM
Chain slap happens the most when in the small-small combinations, so avoid those (you shouldn't use them anyway.) Adjusting the b-tension on your RD might help, but I'm honestly not sure. http://www.sheldonbrown.com/derailer-adjustment.html#btension
A chainstay protector will keep your frame from getting banged up, a good idea on a full suspension MTB. There's probably not much you can do to prevent it, unfortunately.
it isn't thc chain slapping the chainstay, it's the chainstay coming up and slapping the chain on hard bumps.
fact is you have a fairly high inertia chain passing only above a chainstay bouncing all over the place. You can give up mountain biking, and ride only on smooth pavements, or you can accept that chainslap happens, and pad the chainstay.
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