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are brake mount adapters universal?

2248 Views 2 Replies 2 Participants Last post by tetonrider2, Jun 29, 2009

tetonrider2

Discussion Starter · Jun 27, 2009

hi!
i currently have a set of shimano XTs on my bike with a 160->180mm post mount adapter in the front (7" rotor) and an IS->post mount (180) adapter in the rear.

the adapters are the shimano brand adapters (i understand hayes was also an option).

i've got a set of formula "the one" brakes on the way to me.

i notice the formula adapters look a little more "sleek", but i'm wondering if anyone knows if i HAVE to use them, or if i can just use my shimanos. i can't quite tell if there is any clearance difference required from the formula calipers to the shimanos.

can anyone verify that my existing adapters are fine?

i could wait until the new brakes arrive to test it out, but then if they do not work, i'll lose out on a week while i order the right ones. i'd prefer to avoid that.

thank you!

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Squash

· #2 · Jun 28, 2009

No brake adapters are not...

"standard" by any means. That doesn't mean that the shimano adapters won't work with the Formula brakes. But there is absolutely no guarntee that they will. Calipers from different manufacturers often have different shapes that can dictate a specific shape for the adapter. Also with shimano calipers there is often the "option" of having a direct IS or Post mount configuration. This doesn't even take into account pad positioing in the caliper, pad width etc.

Anyway, you can wait and see. Unless your XTs are completely toasted, you won't miss out on a weeks worth of riding. If things don't work out, you'll just have to ride with the XTs till the Formula adapters get there. If you want to have insurance or the XTs are toast I'd say get the Formula adapters on the way now. That'd be the safe bet. Because you never know what combination of calipers and adapters will work and what won't without trying. It's pretty obvious by the lack of responses that few if any others have tried the combination. So play it safe. :thumbsup:

Good Dirt

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tetonrider2

Discussion Starter · #3 · Jun 29, 2009

Squash said:
"standard" by any means. That doesn't mean that the shimano adapters won't work with the Formula brakes. But there is absolutely no guarntee that they will. Calipers from different manufacturers often have different shapes that can dictate a specific shape for the adapter. Also with shimano calipers there is often the "option" of having a direct IS or Post mount configuration. This doesn't even take into account pad positioing in the caliper, pad width etc.

Anyway, you can wait and see. Unless your XTs are completely toasted, you won't miss out on a weeks worth of riding. If things don't work out, you'll just have to ride with the XTs till the Formula adapters get there. If you want to have insurance or the XTs are toast I'd say get the Formula adapters on the way now. That'd be the safe bet. Because you never know what combination of calipers and adapters will work and what won't without trying. It's pretty obvious by the lack of responses that few if any others have tried the combination. So play it safe. :thumbsup:

Good Dirt

thanks much for the reply. i have to order some other items anyway, so i think i'll tack on the formula-manufactured adaptors. i can always return them later on if need be. (as luck would have it, i have to return a couple items as well, so there's no incremental cost to returning the adapters.)

i appreciate the post.

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