swiftspeed star Posted August 22, 2010 Report Share Posted August 22, 2010 Hi, when i push my right pedal down when pedalin along something makes a big clunk has any one got any ideas as what i could be???? Thanks Swift Quote Link to comment Share on other sites More sharing options...
Jamie_Trials Posted August 22, 2010 Report Share Posted August 22, 2010 Maybe your chain skipping, could be freewheel skipping, or just need to grease up the pedal,crank and bb threads. When exactly does it happen, every pedal stroke, when you kick hard? Quote Link to comment Share on other sites More sharing options...
swiftspeed star Posted August 22, 2010 Author Report Share Posted August 22, 2010 Maybe your chain skipping, could be freewheel skipping, or just need to grease up the pedal,crank and bb threads. When exactly does it happen, every pedal stroke, when you kick hard? Whenever u go up a slope really and i doubt that anything is skipping as ive only had the crankset chain and sprocket for less than a week and it is front freewheel if that helps any. Quote Link to comment Share on other sites More sharing options...
isitafox Posted August 22, 2010 Report Share Posted August 22, 2010 How much chain wrap have you got on your rear sprocket and how tight is the chain?? Quote Link to comment Share on other sites More sharing options...
swiftspeed star Posted August 23, 2010 Author Report Share Posted August 23, 2010 How much chain wrap have you got on your rear sprocket and how tight is the chain?? I'm new to trials and i didn't understand the term chain wrap and the top of the chain when pushed down is about 5 mm off the chainstay also i have a 12tooth rear sprocket Quote Link to comment Share on other sites More sharing options...
isitafox Posted August 23, 2010 Report Share Posted August 23, 2010 Chain wrap is how much of the chain is wrapped around the cog but I've noticed your riding a mod so that won't really apply to you, it's moreon stocks which have sprung tensioners. Right, can you upload a pic of your drivetrain to see as that may help a bit more, what type of tensioners do you use, cams, tugs, etc, and what freewheel are you running? Quote Link to comment Share on other sites More sharing options...
stya_bear Posted August 23, 2010 Report Share Posted August 23, 2010 It could be your Bottom Bracket mate, I had a related issue on mine a few week ago and my ball race in the right hand side had smashed to bits, so I had to replace my BB and now its back to silence It clunked for a while and then it felt like a wobbly crank arm, but it was my BB. Other options could be as people have said, your freewheel skipping, due to chain being to tight, to loose, freewheel damaged. Or it could also be damaged/dry bearings in the pedals. Does the crank arm knock on your frame? If it does you have a BB that is not long enough or crank arms that are not offset enough for your frame. Quote Link to comment Share on other sites More sharing options...
swiftspeed star Posted August 23, 2010 Author Report Share Posted August 23, 2010 Chain wrap is how much of the chain is wrapped around the cog but I've noticed your riding a mod so that won't really apply to you, it's moreon stocks which have sprung tensioners. Right, can you upload a pic of your drivetrain to see as that may help a bit more, what type of tensioners do you use, cams, tugs, etc, and what freewheel are you running? Im using chain tugs and a tensile 60click It could be your Bottom Bracketmate, I had a related issue on mine a few week ago and my ball race in the right hand side had smashed to bits, so I had to replace my BB and now its back to silence It clunked for a while and then it felt like a wobbly crank arm, but it was my BB. Other options could be as people have said, your freewheel skipping,due to chain being to tight, to loose, freewheel damaged. Or it could also be damaged/dry bearings in the pedals. Does the crank arm knock on your frame? If it does you have a BB that is not long enough or crank arms that are not offset enough for your frame. My crank arms are about 8mm of the frame and i hope the bb is ok as its an isis one Quote Link to comment Share on other sites More sharing options...
isitafox Posted August 23, 2010 Report Share Posted August 23, 2010 Im using chain tugs and a tensile 60click We could have a winner! The first thing I'd suggest is remove the freewheel and then give it a monster degrease! When they're built they're packed with grease that tends to make the pawls stick and causes it to skip, if you can give it a good flush out with gt85 it should help. Quote Link to comment Share on other sites More sharing options...
swiftspeed star Posted August 24, 2010 Author Report Share Posted August 24, 2010 We could have a winner! The first thing I'd suggest is remove the freewheel and then give it a monster degrease! When they're built they're packed with grease that tends to make the pawls stick and causes it to skip, if you can give it a good flush out with gt85 it should help. Thanks for all your help i will try that tonight and ill let you know if it helped Thanks aganin Swift Quote Link to comment Share on other sites More sharing options...
swiftspeed star Posted August 24, 2010 Author Report Share Posted August 24, 2010 Just got a better look at my bike and it turns out that the clunk is coming from the back wheel any ideas? Thanks Swift Quote Link to comment Share on other sites More sharing options...
isitafox Posted August 24, 2010 Report Share Posted August 24, 2010 I'd still give the freewheel a proper flush out and just make sure the back wheel is nice and in line and the chain isn't too tight or loose. Not much else to go wrong on a single speed setup with no other cogs! Quote Link to comment Share on other sites More sharing options...
BlueSmokeyJoe Posted August 24, 2010 Report Share Posted August 24, 2010 Also be worth checking the cones on your rear hub is its got loose ball bearings! Could be a contributing factor to the binding! Quote Link to comment Share on other sites More sharing options...
swiftspeed star Posted August 24, 2010 Author Report Share Posted August 24, 2010 We had a look at the chain line and at the rear wheel the chain was bending out away from the wheel just before the sprocket so should the freewheel have a spacer inbetween it and the bashring? Thanks Swift Quote Link to comment Share on other sites More sharing options...
BlueSmokeyJoe Posted August 24, 2010 Report Share Posted August 24, 2010 Possibly but remember you need an adequate amount of threads on your crank for the freewheel. Pictures will help in this case. Quote Link to comment Share on other sites More sharing options...
swiftspeed star Posted August 24, 2010 Author Report Share Posted August 24, 2010 Hope these pictures help let me know if you kneed any more. Quote Link to comment Share on other sites More sharing options...
trials owns Posted August 24, 2010 Report Share Posted August 24, 2010 use the chain tugs and pull the wheel in line so the chain is dead straight, you may have to adjust your brakes from doing this. also making the chain a very very bit looser. Quote Link to comment Share on other sites More sharing options...
swiftspeed star Posted August 24, 2010 Author Report Share Posted August 24, 2010 (edited) use the chain tugs and pull the wheel in line so the chain is dead straight, you may have to adjust your brakes from doing this. also making the chain a very very bit looser. If i do that it will make the wheel be out of center in the frame also before i took the photos we had a spacer which was supplied with the bottom braket we removed that to try and get it more inline. Finaly how do you know when the bottom bracket is tight enough and not to tight? Edited August 24, 2010 by swiftspeed star Quote Link to comment Share on other sites More sharing options...
trials owns Posted August 24, 2010 Report Share Posted August 24, 2010 (edited) If i do that it will make the wheel be out of center in the frame also before i took the photos we had a spacer which was supplied with the bottom braket we removed that to try and get it more inline. Finaly how do you know when the bottom bracket is tight enough and not to tight? basically i put all my strength in my bottom bracket when tightening it, i recon a different 12t sproket with the teeth closer in should do the job fine if the wheel is centred straight. Edited August 24, 2010 by trials owns Quote Link to comment Share on other sites More sharing options...
swiftspeed star Posted August 24, 2010 Author Report Share Posted August 24, 2010 (edited) basically i put all my strength in my bottom bracket when tightening it, i recon a different 12t sproket with the teeth closer in should do the job fine if the wheel is centred straight. The thing is the front freewheel is to far out from the rear sprocket causing a slight bend in the chain making it clunk.Does anyone have any good ways of removing a freewheel without damaging it. Edited August 24, 2010 by swiftspeed star Quote Link to comment Share on other sites More sharing options...
trials owns Posted August 24, 2010 Report Share Posted August 24, 2010 The thing is the front freewheel is to far out from the rear sprocket causing a slight bend in the chain making it clunk. Does anyone have any good ways of removing a freewheel without damaging it. aahahhh i thought it was the other way, my bad, try a shorter bottom bracket. Quote Link to comment Share on other sites More sharing options...
isitafox Posted August 24, 2010 Report Share Posted August 24, 2010 (edited) The thing is the front freewheel is to far out from the rear sprocket causing a slight bend in the chain making it clunk. Does anyone have any good ways of removing a freewheel without damaging it. You won't get a spacer on those tensiles and still have enough thread for the freewhell I reckon. What rear sprocket you using and what bottom bracket? Edited August 24, 2010 by isitafox Quote Link to comment Share on other sites More sharing options...
swiftspeed star Posted August 24, 2010 Author Report Share Posted August 24, 2010 (edited) You won't get a spacer on those tensiles and still have enough thread for the freewhell I reckon. What rear sprocket you using and what bottom bracket? A 127mm onza isis bb and and an onza 12t rear sprocket. We got all our parts from rock 'n' roll bikes and these parts are what they told us we needed. Edited August 24, 2010 by swiftspeed star Quote Link to comment Share on other sites More sharing options...
isitafox Posted August 24, 2010 Report Share Posted August 24, 2010 Don't know what to say really as getting a new BB is a big spend, especially if that doesn't solve the problem and I'm assuming the rear sprocket is set to one side on the thread not centred like this http://www.tartybikes.co.uk/images/sprockets/large_tascrewon.jpg Quote Link to comment Share on other sites More sharing options...
swiftspeed star Posted August 24, 2010 Author Report Share Posted August 24, 2010 Don't know what to say really as getting a new BB is a big spend, especially if that doesn't solve the problem and I'm assuming the rear sprocket is set to one side on the thread not centred like this http://www.tartybikes.co.uk/images/sprockets/large_tascrewon.jpg yeah both having a centered tooth sprocket and turning the current one around would make it worse and the bb is what rock 'n' roll bikes said we needed. Quote Link to comment Share on other sites More sharing options...
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