|Query for retro wrenches out there ...||steeveo|
Aug 22, 2001 6:11 AM
|Normally speaking, will a 7-speed freewheel work OK on a bike set up for a 6-speed freewheel? I DO mean freewheel.|
Aug 22, 2001 6:22 AM
|They're both designed for use with a 126mm rear axle. If you have indexed shifting, you will need to change the levers and possibly the rear derailleur depending on model. If you go friction, no worries.|
|Yes, with one modification....||Cima Coppi|
Aug 22, 2001 6:24 AM
|Both 6-speed and 7-speed freewheels mount to hubs w/ 126mm axle lengths, so distance between the drop outs is not an issue. The chains used, however, are slightly narrower for 7-speed and should be used with with the freewheel. I don't know if you can still get 7-speed chains, but Sachs (now SRAM) made the best. I think you can use a SRAM 8 speed chain and it will work fine. |
|I made that change myself...||MrCelloBoy|
Aug 22, 2001 6:32 AM
|in preparation for my first "Terrible Two" D.C. The closer spacing really helped, and my bar end shifters had a "friction" option so shifting was not a problem. If your shifters are indexed only you may need to change shifters. I don't believe any spacer is needed at the wheel.
A new chain may be a good idea as well.
|All correct, good answers men! nm||MB1|
Aug 22, 2001 6:43 AM
|Thanks, and happy freewheeling!||steeveo|
Aug 22, 2001 7:27 AM
|notes:||alex the engineer|
Aug 22, 2001 8:35 AM
|A FEW bikes might have clearance problems with the dropouts, but most won't. An 8-speed chain works just fine, in my experience, with both 6 and 7 speed freewheels. As far as cog selection goes, though, it seems that there are more unusual 6-speed combos out there than 7 speed. I pulled the 7 speed off one bike, so that I could put a nice 13-15-16-17-19-24 freewheel on it.|
Aug 22, 2001 8:39 AM
|Problem is, finding 6-speed freewheels is getting harder and harder.|
|Not so fast||Spoke Wrench|
Aug 22, 2001 3:25 PM
|The issue is clearance to the right dropout.
Since the 7 speed freewheel is obviously wider than a 6 speed freewheel, if you just try to screw it onto the same hub, you are apt to have clearance issues, at least I did. In my case, the chain would just tickle the seat stay when I was in the big/little combination.
If I was doing it over today, I would try to switch a washer from the left side of the axle to the right side and move everything to the left just a little. Then I would readjust the dish of the wheel. I think that would result in a cleaner conversion.