315r Posted April 30, 2016 Report Share Posted April 30, 2016 (edited) Hello! I have a problem with chain alignment after change my old Bonz cranks for a new Trialtech SL . With no problems in the past with my old Bonz and much more old Try-All ones . Now, with my new ones the chain it's much more outside and the alignment is so poor. Today I install a GU ring and extra washer of 2mm and is not enought to achieve the correct alignment. (In Trialtech web claims That at least 7 mm of tread must be cover by the freeweel) Which could be the next step? Maybe a displaced sprocket? Thanks for your help. Edited April 30, 2016 by 315r Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted April 30, 2016 Report Share Posted April 30, 2016 Anything else changed at the same time? The cranks shouldn't make any difference. Pictures? 1 Quote Link to comment Share on other sites More sharing options...
Mark W Posted April 30, 2016 Report Share Posted April 30, 2016 Where are the cranks going up to on your BB axle compared to where they were before? If you've got some old, old cranks on there before the splines could be stretched out a bit so they'd sit a little further onto the axle, whereas with some fresh new cranks they might be a tighter fit so won't sit on quite as far. That shouldn't make a massive difference though. 3 Quote Link to comment Share on other sites More sharing options...
315r Posted April 30, 2016 Author Report Share Posted April 30, 2016 (edited) Anything else changed at the same time? The cranks shouldn't make any difference. Pictures? Nop! Nothing more changed, only the cranks. I'll take a picture this afternoon. Edited April 30, 2016 by 315r Quote Link to comment Share on other sites More sharing options...
315r Posted April 30, 2016 Author Report Share Posted April 30, 2016 Where are the cranks going up to on your BB axle compared to where they were before? If you've got some old, old cranks on there before the splines could be stretched out a bit so they'd sit a little further onto the axle, whereas with some fresh new cranks they might be a tighter fit so won't sit on quite as far. That shouldn't make a massive difference though. Thanks, I'll check this and try to hit with a nylon hammer carefully the crank to ensure that it fits like the old one. But yes, the difference is quite big and the oposite crank is perfectly fitted.... Is strange... This afternoon I'll give you the answer! Thanks!!!! Quote Link to comment Share on other sites More sharing options...
Mark W Posted April 30, 2016 Report Share Posted April 30, 2016 If it's rideable as it is you don't really need to do that - after a couple of rides they'll bed in a little and should sit on further. One thing you can do is make sure there's plenty of grease on the splines, and on the crank bolt (and even under the head of the crank bolt) to make sure that when you're tightening them on, you're getting as much out of it as possible. Chain line can be a lot out without it making a huge difference to how your bike will work - it would be best for it to be perfect all the time, but that's not always going to be the case unfortunately. 1 Quote Link to comment Share on other sites More sharing options...
315r Posted April 30, 2016 Author Report Share Posted April 30, 2016 If it's rideable as it is you don't really need to do that - after a couple of rides they'll bed in a little and should sit on further. One thing you can do is make sure there's plenty of grease on the splines, and on the crank bolt (and even under the head of the crank bolt) to make sure that when you're tightening them on, you're getting as much out of it as possible. Chain line can be a lot out without it making a huge difference to how your bike will work - it would be best for it to be perfect all the time, but that's not always going to be the case unfortunately. Thanks Mark! Probably this can happen, after some rides and tighten bolts they'll bed much better than now, but because I have some mental block with a "snapping chains" I prefer that chain line were straight as possible to avoid my feared failures...HAHA! I'll give you the result this afternoon. Quote Link to comment Share on other sites More sharing options...
Mark W Posted April 30, 2016 Report Share Posted April 30, 2016 If a chain's going to break from poor chainline it'll usually splay a sideplate off a link, so you can just check your chain every now and again and you should be able to catch it in time 1 Quote Link to comment Share on other sites More sharing options...
315r Posted April 30, 2016 Author Report Share Posted April 30, 2016 (edited) Done! I think that It's ok, with 8,5mm of free tread for freewheel. I put a lot of grease and tight and untight strongly in different crank possitions 3 or 4 times and the crank end really close to the position of the old one, but not exactly the same. Try-all and Bonz cracks fits perfect and no need and extra washer of 2mm for a perfect chain alignment. Maybe in the next rides I can tight it a little bit more... Thanks for your Help!!!! Here attach some promised pictures where you can see the alignment, free tread, extra washer and final look. Edited April 30, 2016 by 315r Quote Link to comment Share on other sites More sharing options...
niconj Posted May 1, 2016 Report Share Posted May 1, 2016 (edited) This doesn't look too far off. As Mark said. During the first couple of rides you will need to tighten the cranks again and again and then they should fit nicely with a better chain line. Edited May 1, 2016 by niconj 1 Quote Link to comment Share on other sites More sharing options...
315r Posted May 1, 2016 Author Report Share Posted May 1, 2016 (edited) This doesn't look too far off. As Mark said. During the first couple of rides you will need to tighten the cranks again and again and then they should fit nicely with a better chain line. Yes. Actually I'm happy with the alignment achieved in the photos. Maybe after some rides and tights I can leave out the washer. Although 8,5mm of tread is enough as trialtech web said....(min 7mm) Thanks! Edited May 1, 2016 by 315r Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.