01-24-2013, 11:28 AM
Same tire & tube. (An old Specialized Crossroads 26x1.95")
Two different (559mm) front wheels, both bolted axles, one is 26mm external rim width, the other is 32mm.
The tire is fine on the 32mm wide rim, you can see a tiny bit of lateral run out, but nothing you would give a second thought to on a commuter/utility bike that never breaks 20mph.
When mounted on the narrower rim it's a mess. The lateral run out is awful, no way would you ride it. There's even a strange large cupped area at the sidewall/tread junction.
No matter how many times I remount, re-position the tube, fuss with the bead and pop air in the tire fast, I can't get it to behave.
A Schwalbe 26x2.125 tire is fine on this narrow rim. The offending Specialized tire is fine when remounted on the wider rim.
Frustrating.
Two different (559mm) front wheels, both bolted axles, one is 26mm external rim width, the other is 32mm.
The tire is fine on the 32mm wide rim, you can see a tiny bit of lateral run out, but nothing you would give a second thought to on a commuter/utility bike that never breaks 20mph.
When mounted on the narrower rim it's a mess. The lateral run out is awful, no way would you ride it. There's even a strange large cupped area at the sidewall/tread junction.
No matter how many times I remount, re-position the tube, fuss with the bead and pop air in the tire fast, I can't get it to behave.
A Schwalbe 26x2.125 tire is fine on this narrow rim. The offending Specialized tire is fine when remounted on the wider rim.
Frustrating.