I've acquired an old (probably early 50s) Raleigh Sports/Superbe frame, which I'm planning on fitting a new wheel incorporating a modern SA hub. I know that I'll have to spread the dropouts a little to accommodate the slightly wider OLD, but do I need to file the slots?
The slots are currently around 8mm, and SA lists the new hubs as being "13/32 slotted", which I think is 10.3mm. But is that the measurement across the flats, or including the threads?
So in summary, what size must the dropout slots be for a modern SA hub?
I know I should wait for the wheel to arrive, but I'm impatient and want to start filing now so it's all done in advance
