jeff williams
07-06-04, 01:41 PM
Please read this post and reply if you have info. 140 mm rear axle, 7cogset, mountain bike. Thanks
>jef.
http://www.bikeforums.net/showthread.php?t=56992
>jef.
http://www.bikeforums.net/showthread.php?t=56992
Tandem Cycling - 140 mm axle dishing question?
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TandemGeek
07-06-04, 02:04 PM
A photo would help...
I'm not exactly sure I understand everything that you've described but "dishing" is pretty straight forward. You center the rim to the hub's axle ends (period) and, presuming the frame is straight, you end up with the rim centered in the rear triangle.
While it's possible to get a dishless 145mm rear wheel, anything less than that will usually be dished on the drive side UNLESS you use one of the newer off-set rims from Velocity or Ritchey.
As for rims that taco, if the tension isn't quite right it doesn't take much for them to go out of whack. I can vividly recall taco'ing one of my first wheel efforts while simply unloading the tension on the spokes during the build. Out in the wild, I've seen quite a few rims taco'd or severly out of true due to a single spoke failure (pull-though or breakage) that occured during an impact.
I'm not exactly sure I understand everything that you've described but "dishing" is pretty straight forward. You center the rim to the hub's axle ends (period) and, presuming the frame is straight, you end up with the rim centered in the rear triangle.
While it's possible to get a dishless 145mm rear wheel, anything less than that will usually be dished on the drive side UNLESS you use one of the newer off-set rims from Velocity or Ritchey.
As for rims that taco, if the tension isn't quite right it doesn't take much for them to go out of whack. I can vividly recall taco'ing one of my first wheel efforts while simply unloading the tension on the spokes during the build. Out in the wild, I've seen quite a few rims taco'd or severly out of true due to a single spoke failure (pull-though or breakage) that occured during an impact.
jeff williams
07-06-04, 02:10 PM
A photo would help...
I'm not exactly sure I understand everything that you've described but "dishing" is pretty straight forward. You center the rim to the hub's axle ends (period) and, presuming the frame is straight, you end up with the rim centered in the rear triangle.
While it's possible to get a dishless 145mm rear wheel, anything less than that will usually be dished on the drive side UNLESS you use one of the newer off-set rims from Velocity or Ritchey.
As for rims that taco, if the tension isn't quite right it doesn't take much for them to go out of whack. I can vividly recall taco'ing one of my first wheel efforts while simply unloading the tension on the spokes during the build. Out in the wild, I've seen quite a few rims taco'd or severly out of true due to a single spoke failure (pull-though or breakage) that occured during an impact.
HEY, thanks..RITCHEY BIKE FRAME. HE put this axle in and was dished to not be flat\ inline the side the cogset is on. I think it's the longer hub used for 7 cogset that is the problem.
i have to leave to go see the mech in minutes, I'm kinda freaked.
Jef.
I'm not exactly sure I understand everything that you've described but "dishing" is pretty straight forward. You center the rim to the hub's axle ends (period) and, presuming the frame is straight, you end up with the rim centered in the rear triangle.
While it's possible to get a dishless 145mm rear wheel, anything less than that will usually be dished on the drive side UNLESS you use one of the newer off-set rims from Velocity or Ritchey.
As for rims that taco, if the tension isn't quite right it doesn't take much for them to go out of whack. I can vividly recall taco'ing one of my first wheel efforts while simply unloading the tension on the spokes during the build. Out in the wild, I've seen quite a few rims taco'd or severly out of true due to a single spoke failure (pull-though or breakage) that occured during an impact.
HEY, thanks..RITCHEY BIKE FRAME. HE put this axle in and was dished to not be flat\ inline the side the cogset is on. I think it's the longer hub used for 7 cogset that is the problem.
i have to leave to go see the mech in minutes, I'm kinda freaked.
Jef.
madpogue
07-07-04, 12:51 PM
Well, to be exact, you center the rim between the locknuts. You may have more axle sticking out of one locknut than the other. If so, and you center on the ends of the axle, the rim will not be centered in the stays. If you center the rim between the locknuts, which is where the stays (well, the dropouts) grab the hub, and the stays are straight, the rim will be centered.
TandemGeek
07-07-04, 02:58 PM
Pardon me for generalizing. Fortunately, self-centering truing stands and dishing tools eliminate the need to think too hard about axle vs locknuts, as do most newer machined axle components.
Admittedly, a 7 speed hub and freewheel would most likely have a threaded axle which could be a few mm off dead center if it uses a QR (more if it is a bolt-on solid axle) so making the distinction was most certainly worthy of note.
Admittedly, a 7 speed hub and freewheel would most likely have a threaded axle which could be a few mm off dead center if it uses a QR (more if it is a bolt-on solid axle) so making the distinction was most certainly worthy of note.
madpogue
07-08-04, 12:00 AM
Pardon me for generalizing. Fortunately, self-centering truing stands and dishing tools eliminate the need to think too hard about axle vs locknuts, as do most newer machined axle components.
Admittedly, a 7 speed hub and freewheel would most likely have a threaded axle which could be a few mm off dead center if it uses a QR (more if it is a bolt-on solid axle) so making the distinction was most certainly worthy of note. True, even an old-fashioned rim-centering gauge works off the locknut face. But the original post is about a 7-speed, so I just assumed it was a threaded axle.
Admittedly, a 7 speed hub and freewheel would most likely have a threaded axle which could be a few mm off dead center if it uses a QR (more if it is a bolt-on solid axle) so making the distinction was most certainly worthy of note. True, even an old-fashioned rim-centering gauge works off the locknut face. But the original post is about a 7-speed, so I just assumed it was a threaded axle.