I am putting a set of Hayes Strokers on my bike, and reading through the installation guide I read the following:
Now they included (4) of the 18.4mm bolts, but not any 22mm. I am not understanding why the 18.4mm is enough to work on an IS adapter, but "Not allow you to tighten down your caliper properly"Mount the caliper to the frame or mount bracket using (2) M6 x 1.0 18.4mm long mount bolts and (2) mount washers. Snug the bolts, but leave them loose enough so
that caliper will move on its slots.
Caution: For post mount forks you will need to use (2) M6 x 1.0 22mm long mount bolts. These bolts are supplied in your aftermarket kit or supplied from the bike
manufacture. Failure to use the longer bolt may result in fork damage that will not allow you to tighten down your caliper properly.
Is it really that the 18.4mm doesn't have enough thread engagement?
Is this something I really should be concerned about? Will the 3.5mm make a difference between my caliper shearing off and flying into my spokes?
NOTE: This is with a 160mm rotor, so the caliper will be directly mounted to the fork posts, no adapter.
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Thread: Fork Post Mount Bolt Length?