Originally Posted by
mazdaspeed
... I'll just buy a 6 speed freewheel
If your current 6sp is an Ultra-6, a standard 6sp will also be too wide. Ultra-6 freewheels are about 26mm wide, standard 6sp are about 30mm wide, and 7sp are about 32mm wide. If you need to respace and redish for a standard 6sp, you might as well go with the 7sp you already bought.