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Help! Rear brake caliper reach is a few mm too short!

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Help! Rear brake caliper reach is a few mm too short!

Old 02-05-17, 04:08 AM
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baribari
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Help! Rear brake caliper reach is a few mm too short!

So, I replaced my wheels and now one of my rear pads is a few mm too high.

Is there any way to get them lower without changing to brakes with more reach?
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Old 02-05-17, 05:02 AM
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Did you get smaller diameter wheels or something? Assuming you already lowered your pads as far as they'll go, you can use something called a drop bolt that lowers the entire caliper.

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Old 02-05-17, 05:04 AM
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extended reach brake pad holders. BDop OFFSET HOLDERS
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Old 02-05-17, 06:14 AM
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The wheels are almost exactly the same, except these are a newer model that is tubeless compatible.
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Old 02-05-17, 08:13 AM
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First, and most obvious, is the wheel fully seated in the dropouts? If the wheel is fully seated and the brake caliper centered and the problem persists, you could file the bottom of the slot in the caliper a bit to lower the brake pad. I wouldn't take off more than a mm or 2 but it can be done safely.
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Old 02-05-17, 08:43 AM
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....yes. I have considered filing it. If all else fails I will upgrade to better brakes.
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Old 02-07-17, 08:29 AM
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Is this a 27" to 700c conversion? If you were that close to the edge before, sounds like you're running the wrong brakes.

Once, I had luck using longer "V-brake" pads in my caliper brake instead of the stubby little cartridge pads that are typical with calipers. But, honestly, it's best to just get the right brake.
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Old 02-07-17, 08:40 AM
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Originally Posted by baribari View Post
The wheels are almost exactly the same, except these are a newer model that is tubeless compatible.
"almost exactly the same" can make all the difference. What bike is this? What wheels did you have, the exact size?
If the old wheels are 27" and the new ones are 700c. there is a 4 mm difference in wheel diameter, enough to account for the problem
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Old 02-07-17, 09:11 AM
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If the wheels are the same size, the brake track should be in the same place, give or take maybe a millimeter, and the brakes shouldn't have a problem reaching. The fact you said one of your pads is a few millimeters off leads me to suspect that something's askew, like maybe one side of the axle isn't fully seated in the dropout.

If you could post pics, it might be helpful to diagnose the problem.
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Old 02-07-17, 11:11 AM
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Originally Posted by Lazyass View Post
Did you get smaller diameter wheels or something? Assuming you already lowered your pads as far as they'll go, you can use something called a drop bolt that lowers the entire caliper.

I have not seen one quite like that. Is that something you fabricated, or can you say what brand it is?
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Old 02-07-17, 06:05 PM
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Originally Posted by alcjphil View Post
"almost exactly the same" can make all the difference. What bike is this? What wheels did you have, the exact size?
If the old wheels are 27" and the new ones are 700c. there is a 4 mm difference in wheel diameter, enough to account for the problem
Both wheels are 700c. They're both the same brand.

For some reason the fronts fit just fine.
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Old 02-08-17, 01:58 AM
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If the wheel size hasn't changed, then perhaps you're mounting them differently than prior.

Is this a singlespeed frame? horizontal/track dropouts with the wheel farther back than used to reach might be the reason....
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Old 02-08-17, 06:52 AM
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Rat-tail file.
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Old 02-08-17, 09:15 AM
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Originally Posted by baribari View Post
Both wheels are 700c. They're both the same brand.

For some reason the fronts fit just fine.
Not possible to have the same size and be off by that much. Would literally defy laws of physics/mathematics.

As they say, "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth."

Wheel is not seated properly.

EDIT: also, post pics.
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Old 02-08-17, 09:56 AM
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If the new wheels are the same size/diameter as the old ones (700c for example) and your brake pads don't line up with the new rear wheel installed, something about the way the wheel is installed is different. Maybe the wheel isn't fully seated in the dropouts. Or if it is, perhaps the old wheel wasn't. If you have dropout adjusters, maybe they got moved. Maybe something hit your brake pads hard enough to move them.

For those of us who can't see the bike, it's all speculation.
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Old 02-10-17, 02:44 AM
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I just upgraded to short-reach 105 5800 calipers and there's *plenty* of reach.
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Old 07-30-18, 02:22 PM
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drop bolt needed to move caliper UP

Lazyass:

Can you let me know where you got the pictured drop bracket? I read you filed it to fit a tubular bridge, but I actually need it flat to relocate a rear caliper upwards on a modern steel frame to allow a slightly larger tire size to fit under my dual pivot Campy caliper.

Thanks!!!
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