Tom Booth Posted March 4, 2005 Report Share Posted March 4, 2005 (edited) Right i've got a pair of truvativ cranks with one threaded chainring hole, Can this be threaded? is there a matter of its the wrong materiel(sp?)?. if youve had this done to your truvativs please reply whether it was a success or not please? Cheers Tom p.s How much does it cost to have a bolt hole helicoiled by the way? Cheers Edited March 4, 2005 by boovey Quote Link to comment Share on other sites More sharing options...
Dr. Nick Riviera Posted March 4, 2005 Report Share Posted March 4, 2005 hmm maybe but try getting a longer bolt and putting a nut on the end as a temporary measure or get it tapped out and run a bigger bolt ? i think helicoiling it on the tabs would reduce the strenght a little bit though :blink: iirc matt urban does helicoiling:) Quote Link to comment Share on other sites More sharing options...
nbr-chris Posted March 5, 2005 Report Share Posted March 5, 2005 If you had it drilled and re threaded you wouldn't be able to put a chainring bolt in you'd need a bigger bolt. I'm sure a heli coil would work and they are usually stronger than the original threads. Its about 20 quid for a kit so a chainring bolt thread shouldn't be much at all. I'm assuming its for a granny ring mount yeah? If it is it will be fine heli coiled Quote Link to comment Share on other sites More sharing options...
totaltrials Posted March 5, 2005 Report Share Posted March 5, 2005 No, you couldn't do this, mainly because chainring bolts are a specialist cycle thread, as Ive tried to get one in my factory and we cannot get hold of them apart from a special order which we couldn't even find, so this would make it very unlikely you would get a helicoil in this speicalist thread. You could drill the hole a little bigger and tap it bigger with a standard metric thread then use a normal bolt to go in the helicoil, but you would have to find a bolt which wouldnt stick out a great deal, this is possible. Phil Quote Link to comment Share on other sites More sharing options...
Tom Booth Posted March 6, 2005 Author Report Share Posted March 6, 2005 Cheers lads, i'll see what me LBS suggest as best idea. Tom Quote Link to comment Share on other sites More sharing options...
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