I'm building up an old early 80s Terry Precision bicycle. Most of my time has been spent researching and sourcing the front wheel. It's a smaller frame which uses a smaller front wheel for shorter women. I learned that many small Terry frames use an ISO 520 24" front wheel so I went hunting around for that. None of my local LBS could source any 520 parts. I found a couple of online retailers that had the 24" road rims (i.e. not 24" BMX rims, typically ISO 507) and tires/tubes. I bought two rims, two tires, and three tubes for future spares.
I built the wheel recently and noticed that the brake reach on the front was about 20 mm more than on the rear wheel, which is a standard 700C (ISO 622). I realize now that the earliest Terry Precision bikes used the even-less-common 600A wheel size, or ISO 540.
Now I'm in a strange situation where I have invested quite a bit into a slightly wrong wheel size. At worst it will sit 20 mm lower in the front and I'll need to find a longer reach caliper brake for the front rim. Is that a problem?
Side question: does anyone know any companies that sell ISO 540 road rims (and tires/tubes)?
This whole front wheel situation kinda rags on my otherwise purist Terry restoration so I'm not sure what the best course of action is to proceed.
Turns out that ISO 540 is the size of some wheelchair rims today (along with 507). Has anyone ever used a wheelchair rim for their bike? Where can I find one?
P.S. I know these are many questions and that's against SE guidelines, but to be clear, the main question I have is whether or not using my ISO 520 wheel would be a big deal.