Rear brake "raiser"?
05-26-24, 09:13 PM
#1
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Thread Starter
Rear brake "raiser"?
I wouldn't even know how to search for this. I've had a bit but haven't hit on anything that helps. Maybe it's just a dumb idea
I'm trying to fit 28mm tires on my rim brake bike. The rear tire fits easily enough, but the top of the front tire rubs against the brake caliper. That's the only limiting factor.
The caliper has several mm - maybe even a cm - of downward pad adjustment remaining. Meaning if I could somehow raise the caliper itself, I could adjust the pads down to the brake track. Other than consulting with a machinist, is there anything anyone, anywhere, at any time, has done to raise the brake caliper? Obviously I don't want to drill another hole through the fork crown, just get the caliper up a few mm.
I'm trying to fit 28mm tires on my rim brake bike. The rear tire fits easily enough, but the top of the front tire rubs against the brake caliper. That's the only limiting factor.
The caliper has several mm - maybe even a cm - of downward pad adjustment remaining. Meaning if I could somehow raise the caliper itself, I could adjust the pads down to the brake track. Other than consulting with a machinist, is there anything anyone, anywhere, at any time, has done to raise the brake caliper? Obviously I don't want to drill another hole through the fork crown, just get the caliper up a few mm.
Last edited by Camilo; 05-26-24 at 09:21 PM.
05-26-24, 10:16 PM
#2
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Eons ago, Dia Compe drop bolts, for their single pivot brakes, had 2 spring slots, so they could be inverted and used as a "raise" bolt.
However, those were the first and last time I saw a commercial part to raise a brake.
Depending on your brake, it's not difficult to make one by drilling, and possibly tapping 2 6mm holes close together in a small block of brass or stainless steel.
Another option that may work. Is to mount the brake in front of the bridge. On most bikes that effectively raises it.
However, those were the first and last time I saw a commercial part to raise a brake.
Depending on your brake, it's not difficult to make one by drilling, and possibly tapping 2 6mm holes close together in a small block of brass or stainless steel.
Another option that may work. Is to mount the brake in front of the bridge. On most bikes that effectively raises it.
Last edited by FBinNY; 05-26-24 at 11:15 PM.
05-26-24, 10:19 PM
#3
https://de.aliexpress.com/item/10050...Cquery_from%3A
This is an adaptor to lower the brake calliper...you might be able to use it as a "raiser". Hope that helps.
This is an adaptor to lower the brake calliper...you might be able to use it as a "raiser". Hope that helps.
05-26-24, 10:38 PM
#4
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Some older calipers have more room. Do you have a picture of your present setup?
05-26-24, 10:57 PM
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Stacking a few extra washers between your fork and the brake can get you a few millimeters clearance.
Also Old Universal Side pulls had more tire clearance and often more reach. You could also go for some center pulls. It all depends how much more room you need. Need pics...
Also Old Universal Side pulls had more tire clearance and often more reach. You could also go for some center pulls. It all depends how much more room you need. Need pics...
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05-26-24, 10:59 PM
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Yes. But not all. I have two sets of super short reach calipers for my very close Pro Miyata, SunTour Cyclone and DiaCompe with SunTour Superbe styling. The Cyclone limits the rear tire to 24c. 25s rub. The DiaCompe has far more clearance and the tire will hit the caliper and bridge at the same time.
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05-27-24, 05:18 AM
#7
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Maybe something in this recent thread will help.
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05-27-24, 08:49 AM
#9
Senior Member
I wouldn't even know how to search for this. I've had a bit but haven't hit on anything that helps. Maybe it's just a dumb idea
I'm trying to fit 28mm tires on my rim brake bike. The rear tire fits easily enough, but the top of the front tire rubs against the brake caliper. That's the only limiting factor.
The caliper has several mm - maybe even a cm - of downward pad adjustment remaining. Meaning if I could somehow raise the caliper itself, I could adjust the pads down to the brake track. Other than consulting with a machinist, is there anything anyone, anywhere, at any time, has done to raise the brake caliper? Obviously I don't want to drill another hole through the fork crown, just get the caliper up a few mm.
I'm trying to fit 28mm tires on my rim brake bike. The rear tire fits easily enough, but the top of the front tire rubs against the brake caliper. That's the only limiting factor.
The caliper has several mm - maybe even a cm - of downward pad adjustment remaining. Meaning if I could somehow raise the caliper itself, I could adjust the pads down to the brake track. Other than consulting with a machinist, is there anything anyone, anywhere, at any time, has done to raise the brake caliper? Obviously I don't want to drill another hole through the fork crown, just get the caliper up a few mm.
05-27-24, 09:02 AM
#10
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Yes. But not all. I have two sets of super short reach calipers for my very close Pro Miyata, SunTour Cyclone and DiaCompe with SunTour Superbe styling. The Cyclone limits the rear tire to 24c. 25s rub. The DiaCompe has far more clearance and the tire will hit the caliper and bridge at the same time.
