Shimano chain ring bolts

rockmonkeysc

I have just removed the standard rings from my new SLX crankset. Is it normal that Shimano overtighten all the chain ring bolts to the point where I actually snapped a T27 torx bit?

jimothy78

Dunno, but pretty sure you should have used T30, which might have helped a bit.

rockmonkeysc

T30 is definitely too big.

jimothy78

Really? That's what mine take; Maybe they changed the spec recently?

dusk

Yes they do tighten them a lot, the ones on my Sram cranks were almost as tight. E13 cranks were much easier

rockmonkeysc

jimothy78 wrote:

Really? That's what mine take; Maybe they changed the spec recently?

I have just tried a T30 in one of the bolts incase I was mistaken, definitely T27 in the 2014 SLX cranks.

The Northern Monkey

I used a hammer on the torx to "crack" the bolt and get it started... I think they use a very good threadlock!

fizik

Also found this on my xt crankset, I dont understand what was wrong with hex key bolts anyway!

The Northern Monkey

Hex are easier to round off.

cooldad

If you're an overgrown hairy simian maybe.

mini_death

Odd about '14 slx using t27. My XTR cranks used a t30 but yes, it was firmly threadlocked in place.

mister p

Torx bolts are less likely to round out, well unless you try to use a hex to undo them. I had a rather miffed chap complain that he had rounded out all four bolts on his chainset. It was only when he said he had been using a 5mm that I realised what the problem was. Why he didn't stop after one or even two was a mystery to me.