What Spanner For Ultegra 5700 Chainring Bolts?



Bigbananabike

Active Member
Dec 29, 2004
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30
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I've just bought a used/excellent condition 5700 equiped Scott CR1 Pro (yay me :D ) and what to be able to change the inner ring from 34 to 36 and 38.
I realise it has TORX bolts but what size etc do I need to buy?

Thanks, Paul
 

alfeng

Well-Known Member
Jul 23, 2005
6,723
254
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T-30 is the size which Campagnolo, FSA, and I think some others may use ... so presumably, it is the size which Shimano chainring bolts also use ...

BTW. A T-27 will also work with a little wiggle ... in fact, the T-27 is the size which I think I had been using before checking this morning if another size wouldn't fit (better!?!) because I know (am pretty sure) that it was that TORX driver size which is usually in front of me (i.e., "handier")!