I'm looking into putting a quick release on the rear hub of an older bike (approx. 120mm inside the dropouts). I've found sources for the hollow axle (3/8" or 9.5mm, 26 tpi) and could cut it down to length. Skewers are given a mm dimension, but what dimension does this represent?
My front skewer is 5mm-0.8 thread. Is this typical?
It's the over locknut dimension. Rear wheels are wider than fronts so you need a rear wheel skewer. It'll probably be one designed for 135mm so you'll want to cut a bit off or you'll have a pointy end sticking out.