Rear tire out of round?

So i'm looking at the rear tire before i order a new one and notice on part of the tire it's into the wear bars and on the other half (est.) it's got about 1/32 to go to the wear bars. This is a Dunlop RoadSmart with almost 9K. Haven't riden for 6 weeks or so (winter) but i remember having a vibration at 90+. I thought it was the front tire but now i'm thinking it may be the rear!
Any thoughts or opinions on this?

 

Sounds like pretty typical road crowning. When I replaced my tire recently the downward "Step" in the tread wear on the right side of the tire was easily noticeable. I could run my hand from left to right across the tire face and feel (and see) the added wear from the road crowning; some of our roads are so crowned it's unbelievable...

 

It has been documented that road crowning doesn't affect the wear of tires, cause cupping, etc. Many articles on the subject available online. When I had my bike GMD Computracked the measurement determined that the front axle was 10mm out from the steering head from the factory. During the process of building the engine, the frame was straightened to correct this issue. It is very possible that the chassis/swingarm relationship isn't exactly perfect.

 

+1

Many articles available for those wanting to know. 10mm.....

 

I get a bunch of those add 10mm ads in my Email too.

 

I think he's saying that around the circumference of the center of the tire, one side shows its at the wear marks, one side isn't quite there. I've noticed this on the last few rear tires I've replaced but not the fronts. I think it has more to do with braking and the rear tire locking during downshifts. The skid of the tire causes a little bit more wear on that section of the tire. You dont notice it while there is plenty of tread left but when it gets way down there, you start to notice it.

 

I had the same problem with the Conti R/A, I just took off. One part of the tire looked like it had a few more miles on it, while another was out of tread. I chalked it up to uneven rubber compound. This new, multi- compound tire technology, may not be perfected yet.

It could be time to change to dyna beads, because this could definitely lead to balance problems.

:crazy:

 

This has been my simple minded understanding-
I thought that wear pattern showed that the rider favored more throttle when exiting a corner, to a particular side. I have seen that pattern of wear on all my bikes. Riding in the mountains, I have better sight lines turning left, than right. If we drove on the left hand side of the road, I'd expect the opposite wear pattern.....?

Mac

 

I'm not talking about the left or right side of the tire, but on the crest of it, about the outer circumference. The part of the tire that gets flat from slab riding.

If you put the bike on the centrestand and sit directly behind the bike and spin the tire. The tread remaining on the centre strip is not even all the way around. There are no flat spots, from locking up. It just seems like the treads weren't cut to the same depth all the way around, so some wore out sooner.

I wish I had pics, but that tire is probably already added to the Springfield tire fire. (Est. 1989)
:crazy:

 

Meatloaf and Karazy have it right. I'm talking about the circumference of the tire. Like Karazy said "on center stand spind the tire and look at the center wear only" is were i'm notong the uneven wear. Yes 9K is alot for the rear (i ride hard in the twisties) but im trying to figure if it has anything to do with the high speed vibration that i feel in the bars. Yes i'll get another Dunlop RoadSmart because of it's wear and dry/wet grip.

 

This is probably a manufacturing tolerance issue - probably causing your vibration even though tire may be "balanced" centrifugally.