williams Posted August 12, 2012 Report Share Posted August 12, 2012 So my friend who doesn't use this forum (he's a wimp, hope you see this ) has a minor problem with his drivetrain. His chain jumps of randomly, it has happend like 4 times under july-august. And his chain is tight, and I mean tight, the chain line does look ok for me. And I really don't get why it jumps off. He's the guy who is fixing/setting it up. It's a onza pro MOD bike, with a kmc single speed chain, 13t rear sprocket and a 18t freewheel. Quote Link to comment Share on other sites More sharing options...
Dan_Trials Posted August 12, 2012 Report Share Posted August 12, 2012 Bent tooth? Stiff link? Turn it back ward slowly and see what it does. 1 Quote Link to comment Share on other sites More sharing options...
Azarathal Posted August 12, 2012 Report Share Posted August 12, 2012 Could be really worn sprockets, surprised he's able to ride with 18/13, 18/12 felt too light to me sometimes, plus I would've thought the chain tension would be an absolute pain. Quote Link to comment Share on other sites More sharing options...
williams Posted August 13, 2012 Author Report Share Posted August 13, 2012 Could be really worn sprockets, surprised he's able to ride with 18/13, 18/12 felt too light to me sometimes, plus I would've thought the chain tension would be an absolute pain. Yeah it might be the front freewheels sprocket, since the bike is from 09-10-ish and it's the original freewheel. The rear sprocket is from april, so I don't think it's that worn really. Haha and If you think his gear ratio is weird, you haven't seen his bar angle yet.... Quote Link to comment Share on other sites More sharing options...
SamKidney Posted August 13, 2012 Report Share Posted August 13, 2012 I used to run 18/12 with 170mm cranks which felt the same as 18/13 on 160s. But yeah, worn sprockets or a wonky chainline sounds like the culprit. Quote Link to comment Share on other sites More sharing options...
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