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Dura Ace Calipers not long enough?

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Dura Ace Calipers not long enough?

Old 06-04-17, 06:47 PM
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Jicafold
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Dura Ace Calipers not long enough?

I have a 2006 GIant OCR1 that had I dunno what kind of brakes on originally. I had some Tektro R710 brakes on it for the past year. Worked fine. I stumbled upon some Dura Ace so I put the Dura Ace BR-7700 calipers on there. Even with the brake pads at the limit of travel they still don't make off the tire fully onto the braking surface. How can a modern bike and brakes not match?
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Old 06-04-17, 07:57 PM
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That's just the way it is. Some bikes are made for longer reach brakes than others. That fork is made for some medium reach brakes. Measure from bolt hole to center of rim to get an idea for the reach you'd need.

Once upon a time they made drop bolts for brakes, dunno if they do any more.
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Old 06-04-17, 08:00 PM
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Oops.
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Old 06-05-17, 12:38 AM
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As Lester mentioned above, brakes aren't "one size fits all". Calipers come in different models with different reach to fit different bikes. There are lots of reasons why, including the ability to fit bigger tires, or for fender clearance.

Personally, I'd use brake calipers with the proper reach, but if you really want to use these, you may be able to make 'em work by using offset pad holders.
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Old 06-05-17, 01:09 AM
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it may not be the caliper, but where the hole is positioned in the fork. IOW the fork could be the culprit.

it's also possible to reassemble and/or mount a brake such that it sits higher than expected.

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Old 06-05-17, 08:01 AM
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Yea, move back downmarket, there you find longer reach calipers.. the tektro fit?, use them.

The frame is not a full tilt road race bike, it has clearance for bigger tires..

In past threads, an offset brake pad holder was mentioned... Look for those.?





....

Last edited by fietsbob; 06-05-17 at 08:05 AM.
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Old 06-05-17, 08:11 AM
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Install calipers of the correct length; also, replace those tires. The Dura-Ace pads have cut into the tire sidewalls. Might not result in a catastrophic blowout, but I wouldn't risk it.
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Old 06-05-17, 08:12 AM
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corrado33
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You're trying to fit a top of the line set of brakes that are made to be millimeters away from the tire for aero performance to a bike that has virtually cms of space above the tire.

Of course it's not going to work.

Your bike is made to fit LARGE tires, 35-40c probably. Those brakes are made to work with 25c at max.. probably.
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Old 06-05-17, 09:57 AM
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The Shimano brakes probably work with tires larger than 25mm. I have 26mm tires and there's still loads of clearance on all sides. I suspect that I could use 30mm tires if I wanted to.
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Old 06-05-17, 10:23 AM
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.
...if you only need a skosh more reach, sometimes you can do it by using a set of cantilever brake pads with those swell concave/convex adjustment washers and angling the pads down, then flattening them with sandpaper to meet the new rim contact plane in that position. Also, you can get a tiny additional amount of downward by extending the pad slots in the arms with a round file.

But really, your best alternative is to use a brake that fits. Or you could probably fit 27" wheels in there, with all that space. But that's kinda an expensive solution for a problem that can be solved by reinstalling your Tektros.
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Old 06-05-17, 01:05 PM
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I assume you're wanting to keep the DA Calipers if possible, and you may be able to use something like these: BDop OFFSET HOLDERS . They are a pad holder with a bit of offset for doing this very thing. You'll have to measure how much offset you need and decide whether or not these will give you enough. Also, they are steeply priced at $30 per set (one wheel), but if they will solve your problem, it's worth considering.

I shopped around a while ago and these (strangely) were the only example of this style holder that I could find.

-Jeremy

Last edited by Tunnelrat81; 06-05-17 at 01:10 PM.
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