What Spanner For Ultegra 5700 Chainring Bolts?

[Bigbananabike]

I've just bought a used/excellent condition 5700 equiped Scott CR1 Pro (yay me ) 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]

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")!

 

[CAMPYBOB]

Torque specs here in the service manual: http://si.shimano.com/php/download.php?file=pdf/um/SI-1M30A-003-ENG.pdf

FWIW the 5800 crankset uses T30 bolts.

A manly-man will buy and entire set of Torx driver bits in 1/4" hex drive and 1/4"-3/8"-1/2" square drive! And a new torque wrench! And extensions and drive size adapters! And a set of Torx 'L'-keys!