Dazza1414 Posted September 1, 2014 Report Share Posted September 1, 2014 I've recently built up a new frame by transfering all my parts from my Echo to a Hex frame. Every thing on the drive chain worked fine on the Echo but now the chain is jumping under load. I've tried re-aligning the chain but it hasn't made any difference so far. Has anyone got any suggestions, it's driving me mental! Cheers Quote Link to comment Share on other sites More sharing options...
isitafox Posted September 1, 2014 Report Share Posted September 1, 2014 Pics of the setup?? Quote Link to comment Share on other sites More sharing options...
Dazza1414 Posted September 1, 2014 Author Report Share Posted September 1, 2014 Got no way of posting pics at the moment but it's pro 2 rear hub running a 15t sprocket and try-all cranks with a screw on 18t sprocket. Also running a mr.control sprug tensioner. As said in my first post it all ran fine on mu echo. Quote Link to comment Share on other sites More sharing options...
isitafox Posted September 1, 2014 Report Share Posted September 1, 2014 How tight is the tensioner set? Quote Link to comment Share on other sites More sharing options...
Dazza1414 Posted September 1, 2014 Author Report Share Posted September 1, 2014 Quite tight when the chain is on. Wanted to run a fixed tensioner but the one I have wouldn't fit on the Hex drop outs. Quote Link to comment Share on other sites More sharing options...
isitafox Posted September 1, 2014 Report Share Posted September 1, 2014 Is it tucked up just under the chainstay? All I can think is that there isn't enough wrap on the rear sprocket as I had the same problem a while back, chain looked tight but it was no where near enough! Quote Link to comment Share on other sites More sharing options...
Dazza1414 Posted September 1, 2014 Author Report Share Posted September 1, 2014 Is it possible put more tension on the spring? Quote Link to comment Share on other sites More sharing options...
isitafox Posted September 1, 2014 Report Share Posted September 1, 2014 Is it the one with a single jockey wheel that holds the chain down? If so could you remove the pin that locates on the dropout to control the spring, bolt it tight up to the chainstay and run the chain up and over it instead? Quote Link to comment Share on other sites More sharing options...
konstant Posted September 1, 2014 Report Share Posted September 1, 2014 Unless the chain is so loose that it's flapping about, it'll likely be a chain wrap issue. Imperfect alignment causes premature wear, but is very unlikely to cause skipping. Quote Link to comment Share on other sites More sharing options...
Dazza1414 Posted September 1, 2014 Author Report Share Posted September 1, 2014 It is a single jockey wheel that runs under the chain.I'm thinking about modding the fixed tesioner by grinding the bracket. That way I can push it as tight as possible. Quote Link to comment Share on other sites More sharing options...
Dazza1414 Posted September 1, 2014 Author Report Share Posted September 1, 2014 On 9/1/2014 at 11:58 AM, konstant said: Unless the chain is so loose that it's flapping about, it'll likely be a chain wrap issue. Imperfect alignment causes premature wear, but is very unlikely to cause skipping. Chain is pretty tight, it's only a very light skip but enough to put me off attacking anything. Quote Link to comment Share on other sites More sharing options...
isitafox Posted September 1, 2014 Report Share Posted September 1, 2014 If you grind the pin off pictured you should be able to bolt it up tight without the spring affecting things, might have to fit a washer inbetween it and the hanger Quote Link to comment Share on other sites More sharing options...
Dazza1414 Posted September 1, 2014 Author Report Share Posted September 1, 2014 I've got an onza fixed tensioner that I may try and modify before I try the above suggestion first.Just worried it won't tighten up sufficiently. Quote Link to comment Share on other sites More sharing options...
CC12345678910 Posted September 1, 2014 Report Share Posted September 1, 2014 use a two jockey wheel sprung tensioner (superstar/Trialtech/tensile etc. or splash on a Rohloff) and get it tucked up into the chainstay. most likely (almost deffo) the cause of your chainwrap issue. A single wheel tensioner will not do. The other one I've had is that some sprockets don't have the depth on the teeth others do. I had it with a king cog and solved it with this gusset sprocket. You can see the difference in the photo, with the king cog the chain roller just climbed up the tooth and then skipped, there's an outside chance this could be your problem. Quote Link to comment Share on other sites More sharing options...
Dazza1414 Posted September 1, 2014 Author Report Share Posted September 1, 2014 (edited) Seem to have solved the issue. I have "re-modelled" the bracket on the fixed tensioner with a file and locked it down tight. There is still a slight noise when pedalling backwards but it no longer seems to want to jump when under load.Just hope it holds up. Next job is trying to shave a bit of weight off. It weighs twice as much as my echo did, but then it is a street trials bike I guess. Any suggestions ? Edited September 1, 2014 by Dazza1414 Quote Link to comment Share on other sites More sharing options...
onzatpro09 Posted September 1, 2014 Report Share Posted September 1, 2014 Cut the downtube, one seatstay and one chainstay off, plug the ends and fill the frame with helium Also, who needs 32 spokes per wheel? Just remove every other one and your bike will weigh much less! Trust me Oh, and take your seat off Quote Link to comment Share on other sites More sharing options...
Dazza1414 Posted September 1, 2014 Author Report Share Posted September 1, 2014 On 9/1/2014 at 4:41 PM, onzatpro09 said: Cut the downtube, one seatstay and one chainstay off, plug the ends and fill the frame with helium Also, who needs 32 spokes per wheel? Just remove every other one and your bike will weigh much less! Trust me Oh, and take your seat off Amusing Quote Link to comment Share on other sites More sharing options...
onzatpro09 Posted September 1, 2014 Report Share Posted September 1, 2014 It was only a joke... A bit of lighthearted banter 1 Quote Link to comment Share on other sites More sharing options...
Dazza1414 Posted September 4, 2014 Author Report Share Posted September 4, 2014 On 9/1/2014 at 7:27 PM, onzatpro09 said: It was only a joke... A bit of lighthearted banter No offence taken mate Quote Link to comment Share on other sites More sharing options...
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