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Tech Different brake caliper sizes?

MattRyuu

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Apr 23, 2019
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So my new carbon wheelset arrived Tuesday evening from LightBicycle, yay! Looks awesome! But realized I didn't have a chain whip or other tools needed, so got those today. Just tried fitting the front wheel but the brake clearance is only 3 cm and that is how wide the rims are. Does anyone know if I can just change the calipers out to a bigger gap size? I usually research these things but wanted to ask here first this time.
 

MattRyuu

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Apr 23, 2019
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Can you loosen the cable so the Caliper gets wider ?

Did that all the way, took the whole thing off, unsprung it, even without the cable attached at all to the caliper the wheel won't fit with the brake pads attached.
 

joewein

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Oct 25, 2011
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To confirm, the exterior with of your rim is 30 mm and that's also how much space there is between the brake pads when you're not applying the brakes? What kind of tires are you running there and what model of caliper brake are you using?
 

Cactaur

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Feb 3, 2014
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You might be able to get a bit more clearance if there is a caliper arm adjustment screw to back out. Not sure if there will be enough or the brake pads can be adequately balanced to touch down same time.
 

MattRyuu

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Apr 23, 2019
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Hi @leicaman , @joewein and @Cactaur . Leicaman was right, and so were all of you. The rims are these: https://www.lightbicycle.com/700C-V...eels---30mm-wide-and-tubeless-compatible.html. As you can see they are 30mm wide. The tires are Conti GP5000. Caliper brake model is an old 105 which was part of the groupset when I inherited this bike.

After having a beer, and going back down into my "shop" (our spare bedroom), I took off the pads LightBicycle gave for the wheels and used my older, halfway worn down ones. It works! I feel dumb now for having taken everything apart twice, but a lot more confident when I go to do the rear wheel tomorrow.

Now, how much is it going to cost me in about a year when I try to get these rim brake hubs upgraded to disk brake? I wonder if LB will just do that for me if I handle shipping and the costs of switching.
 

leicaman

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Sep 20, 2012
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Hi @leicaman , @joewein and @Cactaur . Leicaman was right, and so were all of you. The rims are these: https://www.lightbicycle.com/700C-V...eels---30mm-wide-and-tubeless-compatible.html. As you can see they are 30mm wide. The tires are Conti GP5000. Caliper brake model is an old 105 which was part of the groupset when I inherited this bike.

After having a beer, and going back down into my "shop" (our spare bedroom), I took off the pads LightBicycle gave for the wheels and used my older, halfway worn down ones. It works! I feel dumb now for having taken everything apart twice, but a lot more confident when I go to do the rear wheel tomorrow.

Now, how much is it going to cost me in about a year when I try to get these rim brake hubs upgraded to disk brake? I wonder if LB will just do that for me if I handle shipping and the costs of switching.
It would probably be cheaper just buying a pair of disc wheels to be honest. You’d need new hubs, probably new spokes and you might as well get disc specific rims that are lighter than rim brakes due to them not needing to handle the pressures of a brake pad pushing on them.
 

Cactaur

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Feb 3, 2014
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I assume your old pads are for carbon rims? Don't use standard pads for carbon rim brakes.
 

MattRyuu

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Apr 23, 2019
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Definitely going to rep the old AL worn ones. Thanks guys. So much to learn...
 

GrantT

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Oct 2, 2012
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It seems like newer rim brake calipers are designed to be compatible with wider rims. It might be best to try asking LB which calipers they know work with these wide rims then report that info back here.
 

luka

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Jan 13, 2015
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If I were you I'd sacrifice the pads as the cheapest part, just to stay on the road while the solution proper materializes. Pile the new carbon specific ones down to where the caliper will take the wheel and you have a nice bodge until you find the right caliper etc
 

MattRyuu

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Apr 23, 2019
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It seems like newer rim brake calipers are designed to be compatible with wider rims. It might be best to try asking LB which calipers they know work with these wide rims then report that info back here.

Here's what they said:

"There are some offerings from Shimano, SRAM, TRP and EEcycleworks according to the forums, but no specific model names. I've checked with TRP and EE but the majority of what they offer is only compatible with up to a 28mm rim.
I recommend sticking with Shimano just because the quality of their components is much higher than other's offerings."

My calipers are a much older 105 set, at least 6 years old, probably more.

The front of the new carbon pads LB sent are perfect, but when I put them in the brake pad socket/holder, the back doesn't go all in the socket. I did some filing with a razor. This will work for now.

Does anyone have experience with SwissStop brake carbon pads? It looks like they may actually be manufactured to be thinner for some of these reasons, and claim to offer better performance.
 

GrantT

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Oct 2, 2012
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To me, it would be bad practoce to sell you rims that are too wide to work within the design specification of recent Shimano brake calipers without mentioning it.

Can you ask which forums they read about these Shimano calipers on?
 

leicaman

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Sep 20, 2012
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30mm external width does seem pretty damn wide. My Enve 2.2 are 27mm and my sram red callipers fit them just. Not sure if they would be able to handle 30mm
 

luka

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Jan 13, 2015
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A bit of an extreme solution, and I'm not sure how safe it is, but I've seen people riding with their brake calipers open. The little lever that opens it when you're getting the wheel in and out etc. They just keep this open all the time...... Just throwing it in as a thought
 

kiwisimon

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Dec 14, 2006
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Caliper lever open is fine, Might be better to get a caliper that has more clearance. What bike is this for?
 

leicaman

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Sep 20, 2012
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Just looking at the LB website, it seems like they are marketing these as disc brake wheels with the ability to specific a rim brake track. Seems very odd to me as I don’t think most manufacturers make brake callipers that would clear a 30mm rim.
 
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