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So I'm going along, not particularly quickly (as usual) and suddenly my cranks slip round a bit. About 20 degrees it felt like. It didn't feel like it was coming from anywhere else but the cranks or bottom bracket. The chain tension is fine and the wheels are only a month old so I doubt its the lockring or anything like that. Any ideas?
It soundslike it could be that the bottom bracket might have rounded off so that its not a perfect square. Either that.. or the cranks have rounded instead. To be honest its more likely to be the cranks rather than the bottom bracket. I did this to so many cranksets when riding mountain bikes and one of the reason that ISIS/Splined BB's exist.
I would definately get it sorted asap, you can really do your knees some damage having the cranks spin round like that.
Hmm. That doesn't sound much fun. The bike's only just a year old.
Just out of interest, what bike/bottom bracket/cranks are you using?
Sounds like cog/lockring slipping to me.
islipaway:Sounds like cog/lockring slipping to me.
Yup I've had a random cog tightening event, manifested as crank slip.
islipaway:Sounds like cog/lockring slipping to me.
That was my first thought but they're quality components and they were put together by hand just under a month ago (not by me, by someone with wheelbuilding skillzzz). Definitely felt like it was coming from the cranks. But I'm new to this thing really so any ideas are good.
Yeah, the cranks spin cause the cog tightens up after loosening off a bit as the lockring wasn't on tight enough, things you can do to check depend on what tools you have. If you take off the rear wheel and you can turn the lock ring by hand then you have your answer, if not it might still not be tight enough but you'd need a chaintool/lockring tool to sort it. If it's a dodgey crank it would likely have some movement to/fro the frame. Where do you stay? I think I remember battlefield?
A bit further than that I'm afraid...Edinburgh. It's not the shiny Andel cog I got off you, it's the DA one (DA lockrings as well) on the other side. The crank does move a little bit back and forward without turning the wheel, if you know what I mean, but I presumed that was to do with the tension. Hmmm, I'll have a look at those things you mentioned, if not, I'll take it along to bikestation on Saturday + email the wheelbuilder chap.
It's not really a wheel building issue it just happens sometimes as stuff loosens over time, been doing mad skids or a lot of track standing? Those could cause it to loosen over the course of a year. Or it could be the crank who knows!
Looks like it's time to take it apart and do some investigating, although over the course of a year, it should have been apart for servicing/greasing at some point. I hope it's nothing serious.
No mad skids for me, been trying though! It got a free service a month after purchase but it hadn't had much use then. Will get it sorted this weekend. Thanks for the advice folks.
Just my 2 cents, but i had this problem. I never thought it was the crank, but i did think the lockring was slipping. Upon further inspection i found the axle was slipping in one of the dropouts giving the impression the lockring had slipped. I'd get the problem when resisting forward motion and especially when skidding. So i'd stamp on the pedal forwards to reverse the slip. Turns out the axle was slipping on one side. Shitty nuts i suppose (eewww)
When it happens again, check the alignment of your rear wheel before reversing the slip (if you know what i mean?)
Did you get a new wheel slint? That shaker hub?
slint:Just my 2 cents, but i had this problem. I never thought it was the crank, but i did think the lockring was slipping. Upon further inspection i found the axle was slipping in one of the dropouts giving the impression the lockring had slipped. I'd get the problem when resisting forward motion and especially when skidding. So i'd stamp on the pedal forwards to reverse the slip. Turns out the axle was slipping on one side. Shitty nuts i suppose (eewww)
When it happens again, check the alignment of your rear wheel before reversing the slip (if you know what i mean?)
Actually, that sounds like it could be it. I maybe just need to tighten up my nuts (ho ho). I thought they were pretty tight though. Can your nuts ever be too tight?
IFP:My bike is the off the peg EBC fixed job, it's called the 'Track' (only picture I can find, it's not on the catalogue any more). Cranks are fairly standard Truvativ jobs basically these without the little ring. Not sure what the BB is. Probably a cheapo one.
Please tell me you took off the ridiculous looking chainguard when you bought the bike :p
lockring lockring lockring lockring lockring. cylce up gardner st (but not down) then take it to a shop and get em to tighten the fuck out of it wih thier tools. right enough that shit lossens up. i suppose it could be shitty nuts but id do the hill climb- lockring tighten thing anyway. then go to the sandyford about those shitty nuts, youl do yerself a nuisance.
lessbrakesmorecakes: then go to the sandyford about those shitty nuts, youl do yerself a nuisance.
Best quote of the forum.
nah i think that goes to 'i'd rather ride a dildo saddle'
Sounds like your sprocket has come a little loose. Do this: http://204.73.203.34/fisso/eng/schpignonestep2.htm. Tighten up your lockring with a hammer and screwdriver or the proper tool :) It won't come loose for a while after that!
Sprocket, nuts, Family Planning Clinic. I'm going to try the lot.
i would think that the cranks slipping on the BB axel is the least likely of all the above opions.
I'd guess it will be the cog/lockring being loose, if not then the wheel slipping in the dropouts
Hmm. Think it might have been the wheel slipping in the ends indeed. Tightened it up til the multitool broke and it was fine. Then I got a flat. Sad face.
I had the same problem with the wheel slipping in the dropouts a couple of times over the past few days after changing my chain and sprocket. I think the slippage was mainly as a result of the dropouts getting a wee bit bent out of shape when my chain snapped the other week and therefore they needed a lot more tightening than before to cope with the slightly mangled shape.
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