bikeperson45 Posted July 10, 2011 Report Share Posted July 10, 2011 (edited) Got a new mech hanger and still had problems, then found that the bashring is wobbly. Basically, looking at it from above, I spin the cranks and can see the bashring and sprocket wobble from side to side. The cranks don't wobble and are straight and the bottom bracket is still fitted properly with no play. Any solutions/ideas? They're Middleburn cranks and bash on a trialtech pro bottom bracket. I've taken the crank off and tightened the circly thing on the inside (I'm clearly no expert) and that's done nothing. Thanks, really need this sorted before Radfest... Edited July 19, 2011 by bikeperson45 Quote Link to comment Share on other sites More sharing options...
Miles Mallinson Posted July 10, 2011 Report Share Posted July 10, 2011 (edited) It kind of looks like your hanger is bent back slightly so the jockey wheel is too close to the sprocket. Undo the bolts on the wheel and see if its sitting right in the dropouts aswell. Edit: Also the arm that connects on to the hanger looks a steep angle, undo the bolt on that arm on to the hanger then push it closer to the chainstay if you can, you might not be able to, I can't remember if Rolhoff's have a pin on them. Edited July 10, 2011 by Milo123 Quote Link to comment Share on other sites More sharing options...
Gilbert Posted July 10, 2011 Report Share Posted July 10, 2011 I dont know exactly what it could be, apart from a bent hanger my axel kept slipping out as 1 prob, but my chain tensioner cought on sometihng spun round, couldn't go any more, something had to give and my chain snapped so a messed up chain tensioner, snapped chain, and back wheel coming off all beacuse I had a bent derailure hanger because i was out and about that day I got even cycles to bend it back, but it still wasnt right, what sorted it was a new hanger, 4 liinks less in the chian to make it tight, and it all works perfect because the hanger was bent, the axell wouldnt stay in, and the tensioner was out of line made the chain snap, had a huge effect on me lol >:/ Quote Link to comment Share on other sites More sharing options...
bip Posted July 10, 2011 Report Share Posted July 10, 2011 It looks like it should just be your upper jockey wheel being too close to your sprocket. Just need to adjust the tensioner so it's a bit more away from sprocket. Quote Link to comment Share on other sites More sharing options...
bikeperson45 Posted July 11, 2011 Author Report Share Posted July 11, 2011 (edited) Thanks for the advice. Went to do what you guys had said but as I was screwing the tensioner off the hanger snapped ridiculously easily, so hopefully the problem is as simple as that. Thanks again. Edit - updated problem at first post. Edited July 14, 2011 by bikeperson45 Quote Link to comment Share on other sites More sharing options...
bikeperson45 Posted July 14, 2011 Author Report Share Posted July 14, 2011 Got a new mech hanger and still had problems, then found that the bashring is wobbly. Basically, looking at it from above, I spin the cranks and can see the bashring and sprocket wobble from side to side. The cranks don't wobble and are straight and the bottom bracket is still fitted properly with no play. Any solutions/ideas? They're Middleburn cranks and bash on a trialtech pro bottom bracket. I've taken the crank off and tightened the circly thing on the inside (I'm clearly no expert) and that's done nothing. Thanks, really need this sorted before Radfest... Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted July 14, 2011 Report Share Posted July 14, 2011 How much is it wobbling by? Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted July 14, 2011 Report Share Posted July 14, 2011 Are you sure the BB axle isn't bent? Is it wobbly as in physical play/movement possible by wobbling it by hand or just off axis movement when you rotate the cranks? Quote Link to comment Share on other sites More sharing options...
bikeperson45 Posted July 14, 2011 Author Report Share Posted July 14, 2011 or just off axis movement when you rotate the cranks? That, everything feels tight, and so are the bolts. Thanks Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted July 14, 2011 Report Share Posted July 14, 2011 That, everything feels tight, and so are the bolts. Thanks Sounds like a bent BB axle then. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted July 14, 2011 Report Share Posted July 14, 2011 How much is it wobbling by? Quote Link to comment Share on other sites More sharing options...
bikeperson45 Posted July 14, 2011 Author Report Share Posted July 14, 2011 How much is it wobbling by? Sorry, missed that first time round. It'd guess it moves around 0.5 cm from side to side. The clicking from the hub also seems to be impacted from the difference in chainline as the clicking isn't stable. I'd find it hard to believe it's a bent BB axle as I haven't had it that long, or I hope anyway. Thanks for replies Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted July 14, 2011 Report Share Posted July 14, 2011 No worries, just trying to get to the bottom of it! 0.5cm sounds very weird, any gaps between the crank arm and the front of the bashring? Is it *actually* 0.5cm? If there's any way to measure it more accurately that would be good, anything up to around 2mm is pretty normal, but more than that there will be something funny somewhere... A video might help actually. Quote Link to comment Share on other sites More sharing options...
bikeperson45 Posted July 14, 2011 Author Report Share Posted July 14, 2011 0.5 may have been a bit of an exaggeration... Although it must be considerable because the hub's noise seems to be affected and also the pensioner sometimes, presumably because of the difference in the chain line, or something. http://www.youtube.com/watch?v=6OJax0n7nEE Thanks for your help Quote Link to comment Share on other sites More sharing options...
Matthew_Gibson Posted July 14, 2011 Report Share Posted July 14, 2011 how olds the BB? looks a bit bent to me. Quote Link to comment Share on other sites More sharing options...
bikeperson45 Posted July 14, 2011 Author Report Share Posted July 14, 2011 how olds the BB? looks a bit bent to me. Got it new 30th of January, haven't even ridden it that much because of injury. It's a Trialtech Sport Lite. It doesn't look bent from the outside though... Thanks Quote Link to comment Share on other sites More sharing options...
onza pro series guy Posted July 14, 2011 Report Share Posted July 14, 2011 I had this untill recently with my RS7s and so did my mate before me, if the bb is not bent it will simply be where the whole bashguard attaches to the arms, there should be a lockring that tightens to the arm, seems to be a common problem, that has simply worked it's way loose. The bodge it method, required for a quick fix, is carry a hammer + screwdriver with u and slot it into the locking then give it a bash (giggidy) the propper way is take the drive side off and find the right tool ( a freewheel tool of somekind fits, I'll find which one for you in the morning) locktight the f**ker up, trap the tool in a vice and spin the crank arm around on it untill it is as tight as a new-born jewish baby, simples! Quote Link to comment Share on other sites More sharing options...
Mark W Posted July 14, 2011 Report Share Posted July 14, 2011 how olds the BB? looks a bit bent to me. Where the crank bolt is seems to be pretty constant - if the BB was bent that'd be oscillating too. I think it's just the bashring getting it's jive on that seems to make the crank and therefore BB look like it's all on the piss. Quote Link to comment Share on other sites More sharing options...
JD™ Posted July 15, 2011 Report Share Posted July 15, 2011 Does it actually 'wobble' on the crank when you're not spinning it? i.e. does the bashring feel loose? If so, it could well be the lockring mentioned earlier. It's an XTR freewheel tool you need if I remember right. If not, it looks to me like it's just a bent bashring - have you had it off to check? Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted July 15, 2011 Report Share Posted July 15, 2011 Yeah, as said, BB isn't bent Often the spline between the crank and bashring is VERY tight. If you have the tool (sounds like you do) take the crank off, then the lockring off (silver ring with 8 square 'holes' in it), remove the bashguard. Check for any signs of wear. When re-fitting, get the bashring fitted as far as you can by hand, then put everything chainring side down on a wooden bench. Give the end of the crank arm a good smack with a mallet, keep checking that it's going on straight. Then fit the lockring AFTER it's finished bottoming out. Quote Link to comment Share on other sites More sharing options...
bikeperson45 Posted July 15, 2011 Author Report Share Posted July 15, 2011 Thanks for all the replies. Just taken it all apart and cleaned it up. Tried using the mallet method but there didn't seem to be much difference between what I could with my hands and what I could do with a mallet. Put it back together tight again and it's still exactly the same Going to mess around with it some more, but if anyone's got any other suggestions that'd be great. Thanks Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted July 15, 2011 Report Share Posted July 15, 2011 Any gaps between the back of the crank arm and the face of the bashring? Quote Link to comment Share on other sites More sharing options...
bikeperson45 Posted July 15, 2011 Author Report Share Posted July 15, 2011 Any gaps between the back of the crank arm and the face of the bashring? No, and no movement either Quote Link to comment Share on other sites More sharing options...
onza pro series guy Posted July 15, 2011 Report Share Posted July 15, 2011 Thanks for all the replies. Just taken it all apart and cleaned it up. Tried using the mallet method but there didn't seem to be much difference between what I could with my hands and what I could do with a mallet. Put it back together tight again and it's still exactly the same Going to mess around with it some more, but if anyone's got any other suggestions that'd be great. Thanks alright mate asked my mate who fixed mine and works in a bike shop he said its a bb tool of some kind he uses but didn't know the name(durff durff)if you take the drive side off can you move the bashgaurd from side to side without moving the arm? Quote Link to comment Share on other sites More sharing options...
bikeperson45 Posted July 15, 2011 Author Report Share Posted July 15, 2011 alright mate asked my mate who fixed mine and works in a bike shop he said its a bb tool of some kind he uses but didn't know the name(durff durff)if you take the drive side off can you move the bashgaurd from side to side without moving the arm? Wouldn't that still cause it to bend but just in a different postition? Sorry if I'm not getting you Quote Link to comment Share on other sites More sharing options...
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