DA rear caliper on the front?

Discuss light weight issues concerning road bikes & parts.
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HillRPete
Posts: 2292
Joined: Tue Apr 12, 2011 8:08 am
Location: Pedal Square

by HillRPete

Can a DA BR-7900 rear caliper be mounted on the front, or will things blow to pieces? Any problem apart from needing a different length mounting bolt? Thanks.

(Brake shoes will have to be swapped for correct direction, obviously)

by Weenie


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chazzawoods
Posts: 62
Joined: Mon Aug 06, 2012 12:28 pm

by chazzawoods

It should work in theory, if you can find a longer bolt for the front fork. But make sure you can find one before taking anything to bits. I think the only thing making the front and rear caliper different is the length of the bolt. Best of luck!

11.4
Posts: 1101
Joined: Tue May 23, 2006 4:33 am

by 11.4

On three frames I tried this and the thickness of the front of the fork crown was sufficient that there wasn't enough thread exposed behind it to screw a mounting bolt onto it. Even when I milled a nut down to the right length so it would fit snugly, it simply didn't have enough threads to hold onto. You may have different results with a different fork, but this was the same problem on one steel fork and two carbon ones.

oysters
Posts: 60
Joined: Tue Mar 20, 2012 1:19 am

by oysters

Check the shimano tech docs, but I'm pretty sure they would be identical apart from the long bolt and associated washers. And brake pad direction, switch them around!

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