I have an older steel road bike that used to be a 10 speed. I have built a new rear wheel with a 6 speed freewheel, which has different spacing from the old one (wider).
I don't know what the spacing of the new hub is, or what the spacing of the frame is, but I am able to force the wheel into the dropouts by bending them apart with my fingers. Ostensibly, this solution is working for me. The wheel is properly aligned and the original derailers and friction shifters are working well with the new freewheel (12 speeds BABY!)
Is it OK to ride the bike like this, or do I need to cold set the triangles so they hold the wider spacing with no wheel inserted?