Correct Chainring Bolts

harringtonp

Hi Guys,

Was looking for chain ring bolts for ultegra double crankset and ordered:

http://www.wiggle.com/race-face-chain-ring-bolts/

These were too short and would like to get it right this time. Sites give sizes but its hard to know how a 5mm, 8mm etc is measured.

Can anybody send a link to correct bolts for a double crankset ?

In particular saw

http://www.rosebikes.com/article/shaman-chainring-bolts-set-of-four/aid:561076

on rose at a good price and putting in an order with them and was wondering would one of the 5, 8, 13 be what I'm after ? Some doubts as they come in sets of 4 and standard road crankset has 5...

Thanks.

crosstownk

According to Shimano's documentation, the size you need for Ultegra is M8x10.1mm.

Exploded view in the attachment.

EDIT: This place is selling them using the Shimano part number as a reference. I don't know what they're like to deal with but the bolts seem expensive.

http://www.petracycles.co.uk/fc-m970-inner-chainring-fixing-bolt-m8-x-10-1mm-set-4/

Pinch Flat

http://www.chainreactioncycles.com/ie/en/shimano-fc7800-chainring-bolt-set/rp-prod22463

This looks like them?

The Shimano Techdoc website doesn't indicated the size, but does indicate interchangeability between different versions of Ultegra. I'm reading that they should be compatable across all double crank sets

http://si.shimano.com/#seriesList/38/51