Hub gear shifting problems - hub is too tight or too loose?
#1
A potato in every bite...
Thread Starter
Join Date: Oct 2006
Location: Edinburgh, Scotland
Posts: 56
Bikes: Pashley Princess Sovereign <3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Hub gear shifting problems - hub is too tight or too loose?
This picture shows the inside of my bike hub on the side of the brake. In the centre is a nut thing that holds in the gubbins on the other side, where the rear sprocket is located. It is a hub with internal gears and there is another nut located on the other side (the sprocket-side) which keeps the sprocket and splined-sprocket holder in place, on top of a couple of springs and sets of ball-bearings. My problem is that the gears are not shifting (and the shifter lever is difficult to move) and I'm having trouble determining how tight each nut should be. It moves to the lowest gear easily enough, but if I want it in high gear, I have to keep back-pedaling and going over bumps. Too tight, and it seems to stop the wheel from being able to turn at all, and too loose and the gears stop working. Does anyone have experience with these fickle internal gear systems? It's a SRAM super 7.
#3
A potato in every bite...
Thread Starter
Join Date: Oct 2006
Location: Edinburgh, Scotland
Posts: 56
Bikes: Pashley Princess Sovereign <3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Both of those are fine but thanks. When I take the clickbox off the hub, the gear lever works great.
#4
Senior Member
Join Date: Jul 2003
Location: Brooklyn, NY
Posts: 1,453
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
You can find the service manual here:
https://www.sram.com/_media/pdf/sram/...GHS_MY06_E.pdf
First thing I'd check when disassembling the hub is the return spring. Those are known to need replacement on the Sram S7.
https://www.sram.com/_media/pdf/sram/...GHS_MY06_E.pdf
First thing I'd check when disassembling the hub is the return spring. Those are known to need replacement on the Sram S7.