Hub and freewheel question
I have a pretty nice old wheel (campy tipo hubs, super champion 58 rims, DT spokes) with 126 mm spacing and a 5 speed freewheel. The wheel was built for a 5 speed freewheel but I want to replace the 5 speed freewheel with a 7 speed one.
I figure I'll have to remove a spacer or two from the non freewheel side and add it to the freewheel side so that the cone locknut can reach the frame drop out through the wider freewheel (I measured the freewheels and the difference is right around 3 mm).
Once I do this, I'll obviously have to redish the freewheel.
My question is I think there is no magic formula for how many mm of spacing I need on the freewheel side, right? I think the only things I need to worry about is whether the cone locknut can reach the frame drop out and whether there is enough clearance so that there is no chain rub once I'm done.
Is this pretty much all there is to it or am I missing something here?