trialschallenger Posted April 25, 2009 Report Share Posted April 25, 2009 just changed my chain to a kmc kool chainevery time i put a bit of power my chain jumps,it seemed to be the rear sprocket,so i changed it it still jumped,so i changed the jockey wheel on the chain tensioner and it still jumpsit is 5 mm off centre with the sprocket on the cranks would that little bit make it jump? Quote Link to comment Share on other sites More sharing options...
Ali C Posted April 25, 2009 Report Share Posted April 25, 2009 what tensioner do you have?If its a single wheeled tensioner pushing down then there's probably not enough chain wrap around the rear cog which is allowing the chain to ride up and over it.The best thing to sort it would be a dual wheel tensioner or to modify yours so it pushes up. Quote Link to comment Share on other sites More sharing options...
trialschallenger Posted April 25, 2009 Author Report Share Posted April 25, 2009 i have a sprung one single wheeled rather like thishow do i get it to tension the other way Quote Link to comment Share on other sites More sharing options...
Cookyboy Posted April 25, 2009 Report Share Posted April 25, 2009 Think you need to remove the little pin thing? Quote Link to comment Share on other sites More sharing options...
trialschallenger Posted April 25, 2009 Author Report Share Posted April 25, 2009 (edited) there we goignore the brass bit,thats comeing off,i though it was the chain tensioner i put that on there to guide the chain Edited April 25, 2009 by trialschallenger Quote Link to comment Share on other sites More sharing options...
Blitzmo Posted April 25, 2009 Report Share Posted April 25, 2009 Where is it jumping? From the rear sprocket or the front one? The top or the bottom? If it jumps from the top it could be the chain line. Quote Link to comment Share on other sites More sharing options...
bigamac Posted April 25, 2009 Report Share Posted April 25, 2009 Freewheel or cassette? Quote Link to comment Share on other sites More sharing options...
Sam F Posted April 25, 2009 Report Share Posted April 25, 2009 Freewheel or cassette?Rear king.. what does that tell you? Quote Link to comment Share on other sites More sharing options...
Ali C Posted April 25, 2009 Report Share Posted April 25, 2009 its 100% the chain jumping over the rear cog. If you have an old mech or something you can bolt that on quickly and see if the skipping stops. Quote Link to comment Share on other sites More sharing options...
trialschallenger Posted April 25, 2009 Author Report Share Posted April 25, 2009 its 100% the chain jumping over the rear cog. If you have an old mech or something you can bolt that on quickly and see if the skipping stops.hit the nail on the head there managed to get an old one at the back of my garage,it isnt overly great its bloody noisy,would a kings 74 be any goodcheers all Quote Link to comment Share on other sites More sharing options...
trials_pimp Posted April 25, 2009 Report Share Posted April 25, 2009 What Gear Ratio are you running?a 74 Kings would need Modifying to push the chain up, its not hard to do.Rolof would be a better Choise, or the Trialtech/Gusset Bachelor will do nicely.I would allway change the Chain and front and rear cogs at the same time, so they all wear together. Quote Link to comment Share on other sites More sharing options...
trialschallenger Posted April 25, 2009 Author Report Share Posted April 25, 2009 22(front) 17/16(rear)my old chain must have stretched far to much couldnt have been far of snapping but its anoying the way it just happened but i have strapped on an acera mech,with the intension of getting something a bit more perminant later on so ill bare that in mind cheers Quote Link to comment Share on other sites More sharing options...
szczypek616 Posted April 25, 2009 Report Share Posted April 25, 2009 Need more chain wrap around the rear cog. Try and modify your tensioner so it tensions the chain upwards instead of down, then it'll wrap the chain around the rear cog and stop it slipping! Quote Link to comment Share on other sites More sharing options...
trialschallenger Posted April 25, 2009 Author Report Share Posted April 25, 2009 i tried to mod the tensioner i had on there to tension upwards but the frame got in the way and it was still really slack,like i said above ive gone for a old mech i had laying around seems to be allright for now bit noisey though Quote Link to comment Share on other sites More sharing options...
trials_pimp Posted April 26, 2009 Report Share Posted April 26, 2009 I would have thought its not so much a chain wrap issue, but more of a somethings worn issue.Is the rear Cog new?Im Running 20/17 and my Tensioner pushes the chain down, and I get no chain skip at all.By the looks of it your using a cut up cassette at the rear. Do you know the pitch of your chain?I would advise buying a new rear cog, something like the Surley ones which have longer teeth to help keep the chain on.You might find that the pitch of your chain is causing this, as BMX pitch chains dont really work well on MTB cogs. Quote Link to comment Share on other sites More sharing options...
pogo Posted April 26, 2009 Report Share Posted April 26, 2009 Couldn't some links be removed from the chain? Quote Link to comment Share on other sites More sharing options...
trialschallenger Posted April 26, 2009 Author Report Share Posted April 26, 2009 sadly i cant remove any more links i did look at that first,and i doubt it is the cog as i changed it 3 times and prior to putting a rear mech on it still skipped Quote Link to comment Share on other sites More sharing options...
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