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Ultegra Crank bolt size 8 or 9mm?(2 posts)

Ultegra Crank bolt size 8 or 9mm?Lone Gunman
Oct 16, 2001 6:47 AM
On the way out to buy a hex socket for the crankarm. Have used a 8mm once to take the crank off, but it feels sloppy. Is it an 8 or 9 mm?
It's an 8mm. Just make sure it's a good quality Allen wrench.JS
Oct 16, 2001 7:14 AM
Like an actual Allen brand or Bondhus. Bad quality tools tend to fit poorly and in this case can lead to losing a little knuckle skin, Ouch.