WorldIRC

The wheel is perfectly in true (you can tell since the disc doesn't rub), but the tire has a wobble to it. It appears to be seated evenly.

Ideas?

bikinfool

Some tires just aren't molded perfectly, pretty common with my mountain bike tires.

bikefreakvinnie

Hope this helps you, after I fit a tire I go around the wheel and lift the tire over on one side towards the middle, then on the other side towards the middle to check that the tire rim isn't sitting on the tube! When the tire is slightly sitting on the tube it can cause a slight wobbly bulge!..

chevy42083

I generally put like 20lbs in, then squeeze the tire all the way around to separate it from the rim, then continue to inflate... preferably with no weight on the tire. This seems to avoid any large issue with bead not being seated.

Also, seems like some cheaper tires just aren't as nice and round.

FBinNY 

A nervous rider.

Seriously, it probably isn't seated perfectly.

The area where it wobbles to is probably deeper in the rim than the rest, or the side it wobbles from may be high which is a problem that leads to blowing off at full pressure. (or both).

Check and reseat the tire, at low pressure then check again. The best pressure to pull a low spot out varies. Usually I prefer to do it at low pressure, but on some tires it's easier to use high pressure to help lift it.

BTW- as the Bikinfool said, some tires aren't made that well, or migh have been stored badly and have taken a set. Sometimes that relaxes out over time. When you by tires look for ones that don't appear to be the end ones from a bundle, where the tension of the strap kinked them.

WorldIRC

These are high end Schwalbe Marathon Dureme tires I will check the seating!

ScrubJ

As I'm not familiar with that particular tire, does it have any kind of stripe or color band? I've seen tires run perfectly true but look off due to a molding issue with the different colors or compounds.

Other than that, what chevy42083 says. Some tires just aren't nice and round.

WorldIRC

That's what they look like.

coldfeet

The fact that the disc doesn't rub, isn't anything to do with the truenesss, or otherwise, of the rim.

At least, not in my book. Anyone else say different?

bikinfool

True, trueness of the disc has nothing to do with the trueness of the rim...

Al1943

What disk? If you are referring to the disk of a disk brake that doesn't have anything to do with a true rim.

WorldIRC

I guess if I think about it your right. The disc is attached to the hub, not the rim. I could throw my wheel on my buddies wheel stand and see if its true or not. But it's also just as good for me to try the other mentioned advice with checking seating.

dabac

(Assuming you're talking about a brake rotor here...)
No you can't. The rim disc is solidly mounted to the hub, and will stay true regardless of what happens to the rim. Looking at the rotor will tell you just about nothing about the state of the rim.

1) rim has gone out of true
2) tire isn't seated evenly
3) damage/production flaw has left you with an uneven tire

Leebo

Check for loose bearings/ quick release. Check to make sure the wheel is seated in the fork properly. Inflate the tire to 5-10 psi. Then take a soapy sponge and get the soap and water between the bead and the rim and inflate to 50 psi. This always works for me to get the bead seated properly.

WorldIRC

I deflated tire, squeezed the tire all the way around, re in flated, all is good now