Bicycle Mechanics - Truing stand question

I recently bought the Park TS-7 truing stand and have a question about it's use. When putting a front wheel into the stand I noticed that it does not sit exactly vertical. When truing a wheel I can have the gauge adjusted to just about 1mm from the rim and all looks good. However, when I flip the rim over it is about 5mm from the gauge.

At first glance I thought the wheel was not dished correctly but when I used my dishing tool it turns out to be dished perfectly. Upon closer inspection I believe the reason for wheel sitting unevenly in the stand is because of the threaded area of the skewer is a slightly different diameter than the other side of the skewer. I pretty much verified this by reversing the skewer and checking it again. When I put the rear wheel in it sits perfect no matter which way you I flip the wheel but the rear skewer is different from the front.

It seems to make it a little more effort to true the front wheel because I have to reset the gauge every time I flip the wheel over. It crossed my mind to find a long bolt the same diameter as the front skewer to use on the stand so that I don't have to reset the guage but I've never seen the wrench at the LBS do that. What do you guys think? Any suggestions?

Thanks

The axle ends should be the same size. Is one of the quick release springs facing the wrong way? (The small end of the cone should point towards the axle)

The axle ends should be the same size. Is one of the quick release springs facing the wrong way? (The small end of the cone should point towards the axle)

There is a definite taper down to where the threads start. There are no springs. This is the front wheel on a mountain bike. The dropouts rest on the adjusting nuts of the skewer rather than the actual skewer itself. That is why it is in alignment when mounted in the fork. It is only when I put it in the truing stand that it presents a problem.

Is this an oversized 20 mm through axle or something? If it is a regular wheel then the truing stand should grip the wheel just like the fork does. The arms of the truing stand do not rest on the skewer or quick release, they rest on the axle itself or as you call it the adjusting nuts of the skewer. By skewer I think that you mean axle.

-Ryan

Is this an oversized 20 mm through axle or something? If it is a regular wheel then the truing stand should grip the wheel just like the fork does. The arms of the truing stand do not rest on the skewer or quick release, they rest on the axle itself or as you call it the adjusting nuts of the skewer. By skewer I think that you mean axle.

-Ryan

It's 10mm. Resting the adjusting nuts in the truing stand arms won't work. The wheel can move back and forth on the axle/skewer because the threads stop about 5mm from the hub.

I'm not familiar with the TS-7 but my Park stand is capable of lateral calibration when it needs centering from time to time. But I still find myself flipping the wheel frequently to assure proper dish.

George

It is best simply to true the wheel laterally (side to side) and then check the dish with the dishing tool. If both are good, the wheel is good. The stand simply holds the wheel and allows for truing.

See http://www.parktool.com/repair_help/howfix_truing.shtml
and for cetering http://www.parktool.com/repair_help/wag.shtml