Re: Saw-tooth Tire Wear (artemis)

Front and Back? Inside or Outside edge?

 

Re: Saw-tooth Tire Wear (JimLill)

It's not very noticeable at this early stage. I noticed it after my weekend trip. I first noticed a sound like a far off helicopter, so I checked out the tires.

It seems to be mostly on the front tires. It appears to be on inside and outside edges of both front tires.

It seems to be the same on the rear tires, but to a lesser degree.

 

Re: Saw-tooth Tire Wear (artemis)

Not sure what saw-tooth means, but could they just be cupped from bad alignment?

 

Re: Saw-tooth Tire Wear (Wayne T5)

Saw tooth... meaning if you look at the car from the side, the tread has a saw-tooth appearance.

 

Re: Saw-tooth Tire Wear (artemis)

Okay, that sounds like they are cupped to me.

I would have the alignment checked. Sometimes these cars are delivered with the alignment out.

 

Re: Saw-tooth Tire Wear (Wayne T5)

what pressure are you running? cold and hot?

 

Re: Saw-tooth Tire Wear (JimLill)

This sounds like "feather-edging" to me. I think some is to be expected, especially on the fronts after 10k miles. Usually caused by the fact that on average, braking forces are greater than acceleration forces, creating uneven wear of the tread blocks in the fore/aft direction. Each tread block will have one rounded or dull edge and one sharp or feathered edge.

Feather edging can be detected by running your hand around the circumference first in one direction, then the other. You will easily feel the sharp feather edges more going in one direction than the other.

Cupping is usually caused by worn shocks or unbalanced wheels. You would see several adjacent tread blocks being worn low, transitioning into several blocks that stand higher, forming a smooth-to-the-touch but wavy surface around the circumference.

Of course, under-inflation or alignment errors will exasperate the problem.

Feather edging can be mitigated by rotating tires in an X or modified X pattern (and that, my friends, is a whole other can o'worms!).

 

Re: Saw-tooth Tire Wear (artemis)

Quote, originally posted by artemis »

I have noticed a saw-tooth wear pattern on the tires of my 2005 V70R. It has just under 10,000 miles.

Here is an article relating tire wear to alignment, HTH

http://www.familycar.com/alignment.htm

 

Re: Saw-tooth Tire Wear (Dyno)

Yes, this may be the case as the "feather edge" or "saw-tooth" seems to be fairly uniform on the front tires and less noticeable on the rear. I'll bring it into the dealer to check and rotate.

I wonder if anyone else has noticed this type of wear as well.

 

Re: Saw-tooth Tire Wear (artemis)

Sounds like an out-of-balance tire, to me.

 

Re: Saw-tooth Tire Wear (Short Circuit)

An out of balance tire won't cause this, an out of ALIGNMENT car will. Also, lack of tire rotation will too.
Alignment, alignment, alignment.
I've been telling you guys this for two years now.
Keep your car in alignment, unfortunately, (at least from my own personal experience) the R goes OUT of alignment quite often for various reasons.
Oh, and if you people with lowered cars don't rotate your tires every 4K miles your rears will be toast (because of the non adjustable neg. camber) in 10K miles
JRL