surf air snow Posted March 19, 2007 Report Share Posted March 19, 2007 (edited) A couple of weeks ago while out riding my left crank arm fell off. And no matter how much I tighten it up now, after a couple of hours riding it falls off.Any advise welcome on how to keep it on. Edited March 19, 2007 by surf air snow Quote Link to comment Share on other sites More sharing options...
the_ferret Posted March 19, 2007 Report Share Posted March 19, 2007 tighten it?get a new bb make sure you keep it tight it sadly cannot do it itself mate you may have threaded parts so check them and repost for more advice oggy Quote Link to comment Share on other sites More sharing options...
dave85 Posted March 19, 2007 Report Share Posted March 19, 2007 Is it a square taper or a spline where it fits onto the BB axle?What's probably happened is the taper/spline has been deformed (rounded), this lets the bolt tighten up on its own threads rather than pushing the crank on properly.If it's a square taper, take it off and give everything a good clean. Cut 4 strips out of a coke can and put these between the flats on the axle and the crank. That should help keep it on. Quote Link to comment Share on other sites More sharing options...
um....tasty Posted March 19, 2007 Report Share Posted March 19, 2007 Lock tight is always good. Quote Link to comment Share on other sites More sharing options...
ned1 Posted March 19, 2007 Report Share Posted March 19, 2007 Lock tight is always good.aye i agree just loctite them in..only use a little bit though otherwise you'll never get the bolts back out lol Quote Link to comment Share on other sites More sharing options...
tom 20 Posted March 19, 2007 Report Share Posted March 19, 2007 (edited) My mates crank bolts kept coming undone and we locktited them, its very good at " locking" the bolt in place but there a bugger to undo. He snapped the bolt of in the cranks trying to undo it, which resulted in a new bb Edited March 19, 2007 by tom 20 Quote Link to comment Share on other sites More sharing options...
zonaboy dan Posted March 19, 2007 Report Share Posted March 19, 2007 Hi there my Friend had the same problem and he needed some new crank arms because they were rounded off insideand he also got a new bottom bracket just to be shore that it wasn't that, that was rounded off hope i helped mate. Quote Link to comment Share on other sites More sharing options...
surf air snow Posted March 19, 2007 Author Report Share Posted March 19, 2007 thanks will look at getting some locktight stuff n if that dont work new cranks it is lol Quote Link to comment Share on other sites More sharing options...
charlie >est< Posted March 20, 2007 Report Share Posted March 20, 2007 (edited) I have the same problem with ISIS I have put a bit of acryllic on the thread of the bolt and it stays in for a bit longer (it works the same as lock tight). I have to get a new crank to stop it completely.You have to tighten cranks lots or they will come loose. Edited March 20, 2007 by charlie >est< Quote Link to comment Share on other sites More sharing options...
Sucram Posted March 20, 2007 Report Share Posted March 20, 2007 I have the same problem with ISIS I have put a bit of acryllic on the thread of the bolt and it stays in for a bit longer (it works the same as lock tight). I have to get a new crank to stop it completely.You have to tighten cranks lots or they will come loose.Lol i cant believe Cycles UK advised you to use nail varnish. Quote Link to comment Share on other sites More sharing options...
Adskivw Posted March 20, 2007 Report Share Posted March 20, 2007 mine did this on my Square taper monty cranks, They did this because they had come loose and rounded one edge of the square resluting in it not tighting up propely and keep moving every time you pedal which loosens off the bolt!If its bad you may have to replace your cranks, and maybe BB if the threads have gone! thats what i had to do! Quote Link to comment Share on other sites More sharing options...
charlie >est< Posted March 20, 2007 Report Share Posted March 20, 2007 Lol i cant believe Cycles UK advised you to use nail varnish.Yeah, lol that didnt work. Acrylic does Quote Link to comment Share on other sites More sharing options...
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