Heyo. I have an old bike I'm doing upgrades on, but I've hit a snag. The front brake arms are in need of replacement, so I bought a set (two, actually) of calipers that match the old ones. They're the older side pull, single pivot calipers you see on beach cruisers and some BMX bikes these days. Rear ones went on fine, but the front ones don't have a long enough mounting bolt to go through the fork's mount. In fact, if the new ones are anything to go by, the old ones were only long enough because there appears to be a few parts missing.

Is there a brand that is known to have a long mounting bolt, or should I be able to disassemble these and get an off-the-shelf bolt to replace it?

Thanks,

M.

Brake mounting on many bike frames is by recessed sleeve nuts now, those are made in a variety of lengths.

Tektro may be the likely place to look to external nut fixed brake calipers . they are a high volume brand .

Given, single pivot brake the manufacturer makes the center bolt, so you need to get theirs from them.

not much generic ... Asia makes whole brakes for cheap..
economics to just make bolts that cost more than the whole brakes , yea right !

some times recessed fronts become rears . wing it.

The fork's rear hole can be drilled out to accept a recessed nut. These nuts are available is varying lengths to accommodate different crown thicknesses. These nuts are also available with their own internal threads to accept a bolt to attach a fender clip with. Problem Solvers makes these. Andy.

So SOP is to drill out the rear of it large enough to accept something like this:
https://www.amazon.com/Problem-Solver.../dp/B001CJXGK4

Then it threads onto the brake's center bolt and the two hold each other together against the crown?

M.

Or, get another Front Brake and put it in the Back. center bolt already longer .

But the rear ones are fine, and the front brakes won't reach.

M.

a longer reach front brake Obviously Will

Did your replacement brakes come with standard 10mm nuts or with recessed nuts like the linked Problem Solvers? If 10mm nuts, you may have the front brake on the rear. If recessed nuts, you will need the longer 30mm one and drill the hole in the fork to 5/16. You can probably get the 30mm nut from the LBS cheaper.