ArgoMan

Hey all. I'm about to purchase a set of 105 BR R7000 rim brakes for my new build. I measured the frame to see how long the bolt has to be; that being the long bolt that connects the caliper to the frame (I don't know the technical name for it.) I need a bolt that is at least 2 and 1/8 in length. With that in mind, will the R7000 fit with the bolt/nut it comes with, or will I need one of those longer-length nuts? Thanks.

SoSmellyAir

Are you talking about (A) the front brake, which would be mounted on the fork, or (B) the rear brake, which would usually be mounted on a bridge across the seat stays, except for (C) on some TT frames, the rear brakes are mounted under the bottom bracket?

A comes with a long bolt, B comes with a short bolt, and I don't know about C.

ArgoMan

Thanks. I only measured the front. So, I reference the front rim brake, which mounts to the upper fork. The bolt has to be at least 2 1/8 inches long to pass completely through the fork. I'm building out a 2014 Cannondale Slice frame. I suppose just about any modern rim caliper should fit.

ThermionicScott 

The only time I've had to juggle brake bolt lengths was on vintage nutted brakes. I'd be very surprised if you need to do any of that when installing modern brakes on a modern frame.

ArgoMan

thanks! That was my thought. Just wanted to be sure. On a related note, do you know if the older Dura Ace 7700/7800 accommodate 28mm tires?

ThermionicScott 

As long as the frame doesn't mount the calipers in a goofy place relative to the axles, I would expect so. They have a reach of 39-49mm, the same as a few other Shimano brakes in my collection, and 28mm is about the smallest 700C tire I'm willing to use.

https://velobase.com/ViewComponent.a...117&AbsPos=486