I just happen to have a spare Sachs hub with the 7 speed in the basement. As said above the high and low gear will be the same on both a 7 or an 8 hub. You will have 3 more redundant gears some place in the middle. If you feel the need to spend some money there are better places to do it. Roger
Last edited by rhenning; 09-17-14 at 07:44 AM.