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Anyone got any real world experience on how effective a helicoiled thread on the drive side crank pedal thread holds in an environment where pedal strike is likely?
I have recently stripped 2 drive side crank arm pedal threads after pedal strike. The first was a 6 year old xtr crank that had taken some serious hits over the years, being through a few sets of pedals and was kind of not a surprise, but the most recent was its replacement 6 month old xt crank that still looks pretty new and to be fair I was a little disappointed that it went so easily.
A mate suggested a helicoil fix rather than new crank and he has done one on a cx bike but this is a whole different world to rock and root mountain biking, do they hold or am I just throwing good money after bad.
In my experience and to my knowledge, a heli coiled thread should be stronger that than a plain thread, particularly in aluminium, if done correctly.
As above mentioned: heli coil is strong. Never used it on a crank - but in other "aluminium" locations.
For me, crank: sounds like it's worth trying it.
Well I've heli-colied a cylinder head stud in a highly tuned Honda Type R engine before and that held, so I see no reason why it would be any different in a crank arm
Had a couple done on Shimano cranks over the years, been spot on.
perfect for the job HOWEVER as i said on the other thread you need someone with the tools and skills to do the job .
speak to jamie porter - he has the Relevent Taps and the engineering tools to do it.
9 times out of 10 especially if you have done it by clipping pedals running the black and decker through will just result in you helicoiling a wonky thread in place !
I have had cranks helicoiled and it was great. Not failed yet.
Great thanks for the responses seems it’s work a go.
Yep, had mine done a Wheelbase, £20 ridden plenty of miles and it's been spot on since.
Definitely do it. I've had cranks shortened and helicoiled for tandems and they take a lot of torque. No issues.
Weird how a pedal strike would strip a thread.
I had some cranks that where done. No problems was done by someone with the full kit.
Ill do it for you over the bh weekend if you bring it doen. It will cost you a packet of those caramel digestive biscuits. And a pint of milk for the tea.
Not bothered helicoiling them but have killed a couple of xt cranks this way. On both occasions found a second hand replacement from a person who had killed the other side to me 🙂
I'm sure I read somewhere that they are more susceptible to failure than say the SLX due to manufacturing difference. As in the xt is threaded rather than a threaded insert or some thing.*
*May be totally wrong
Porter_jamie that’s a bargain, I’d need to buy 2 packs because I’d have eaten the first by the time I got to yours. I’m not going to find out you live in the SW of Uk and it’s like a 10 hr drive.
Unit is in essex