I'm not sure yet, I have those 9 + bikes i got from a barn auction that all will need the spokes replaced. Most of them are for 26" rims, so i think those will be about 10 1/2 inches +- but i haven't measured any yet. I also have a 1946 CCM with 28" wheels. One thing i noticed about the old bikes is that the spoke nipples are about twice as long as the newer bikes, so that might throw off the measurements a bit.