Bicycle Mechanics - SRAM S7 IGH problems
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07-21-10, 08:29 AM
I had a blow-out yesterday on my commuter, equipped with a SRAM S7 IGH with coaster brake. I changed the tube and tire, and when I finished putting everything back together, there was a ton of resistance for any movement of the cranks. Normally, there is maybe 20 or 30 degrees of no resistance when either backpedaling to engage the coaster brake or forward to engage the drive. Now the resistance exists throughout, and it doesn't matter whether the "clickbox" is attached or not.
The only thing I can think of is that maybe I've bent or broken something when reinstalling the clickbox, which I realized by reading the SRAM tech manual, I was supposed to be doing in 1st gear though I've been doing it in 4th all this time... But, I've been riding this hub for a year without any troubles, and have had to remove the rear wheel for flats or chain maintanence a dozen times, and never with any reassembly trouble.
Any ideas what might be the problem here? I'm not eager to open up this complex hub to find out...
07-21-10, 10:46 AM
Lube in the hub sparing from the factory, a year of use, .. Some addition of new lubrication needs to be added?
I have a simple AW3. thru the hollow axle for the shifter chain
or Click box pin in your case, I added some Phil Tenacious Oil, and it's better now..
I'm not eager to open up this complex hub to find out...
The S7 is actually one of the simplest internal gear hubs to work on (http://www.youtube.com/watch?v=xCzECcBSxlY).
No, seriously (http://www.youtube.com/watch?v=HPekmOAHjL0).
But I'd guess it's a shift tube/shift rod/locating sleeve problem, rather than an internal issue. I could be wrong.
PS - Uh, the tire's not rubbing on the frame, is it? Of course not. Sorry.
07-21-10, 01:24 PM
Uh, the tire's not rubbing on the frame, is it? Of course not. Sorry.
I was thinking the same thing. We all overlook the obvious from time to time.
07-22-10, 09:09 AM
No, the tire wasn't rubbing on the rim, but something almost (or more???) stupid.
When I was changing the tube and tire, it was almost dark out. I couldn't see very well (and I was doing it out front of my apartment, which is in a sort of marginal neighborhood--so I was working quickly)... In better lighting, I realized that what I had done was mount the wheel with the drive-side non-turn washer inside of the dropout. The implications were that when I tightened it down, the tooth on the washer poked through the outer rubber dust boot and jammed up very nicely against the seal over the bearings. This, in turn, put a ton of pressure on the bearings and accounts for the markedly increased resistance with any wheel movement.
Smooth move, eh?
07-22-10, 10:12 AM
All's well that ends well. Happy riding.
07-22-10, 06:01 PM
Yes, thank you for your positive perspective on this bungle.
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