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Re: Yokohama AVS db s2 Tires
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#11
 
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Re: Yokohama AVS db s2 Tires -
07-07-2003
, 06:55 PM
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The wear where each treadblock is ramp shaped like little chisels is usually due to too much toe-in (or toe out). -Fred |
tires - thought toe-in (out) problems wore only the edge on one side of the
tire.
Frank
#12
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You know what now that I think about it they weren't s2, but I do know they were the avs db. I had the tires at the end of their life, so my experience with them may not be the best to base your decision on. I've had other Yoko's before and they were great. They were for my mercedes 560 sel, so they weren't performance tires. Yoko tires are offered at a great price, but my original opinion of looking into the bridgestone potenza s03s still stands. -- -DItalianSalami -97 Estoril Blue M3 -Remove Spamsux from Email to Respond |
#13
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"Fred W." wrote: The wear where each treadblock is ramp shaped like little chisels is usually due to too much toe-in (or toe out). -Fred Even if this wear is equally on both the inside and outside edges of both front tires - thought toe-in (out) problems wore only the edge on one side of the tire. |
vertical axis relationship to the road surface. Ideally (for tire wear) it
would be perpendicular to the road at all times (even when cornering) but
since there is some roll-over when cornering we normally tilt the wheels
slightly in at the top to compensate. This is why the inner edge of the
tire wears faster.
Toe is the tilt (in or out) of the tire in a horizontal axis, in
relationship to the direction the car is moving. Again, ideally for tire
wear, the wheel would be aligned completely parallel to the car's centerline
and the direction of travel. However this usually results in very light
steering and a tendancy to wander. That is why the front edges of the wheel
are normally "toed-in".
If there were zero camber and proper inflation but a large amount of toe-in,
the tread blocks would wear that way (chisels) and evenly across the tire.
-Fred
Here is a simple explanation of wheel alignment:
http://www.familycar.com/alignment.h...ering%20Center
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#14
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"Fred W." wrote: "If there were zero camber and proper inflation but a large amount of toe-in, the tread blocks would wear that way (chisels) and evenly across the tire. -Fred Thanks Fred, I understand caster, camber etc. I'm still confused on your explanation of wear, however. When I "screwed up" the toe-in on one of my cars, it wore only one edge of each front tire, if I remember correctly - but I might be wrong on this - it was a long time ago. The chisel wear that I'm getting now is NOT evenly across the tire - it is ONLY on the outside edges (both edges of each front tire) Center 2/3 tread is very nicely worn - ie. correct wear. |
single alignment factor that contributes to uneven wear. In other words, it
would be a combination of all of the various factors which cause it.
In your example, the toe in is probably excessive and since there is some
wheel camber, the inside edges get the biggest ramped profile. Did you
check out that link I sent with the explanations? It has some nice pics
describing the various factors too...
-Fred
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#15
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I am not an expert on tire wear, but I would imagine that there is never a single alignment factor that contributes to uneven wear. In other words, it would be a combination of all of the various factors which cause it. In your example, the toe in is probably excessive and since there is some wheel camber, the inside edges get the biggest ramped profile. Did you check out that link I sent with the explanations? It has some nice pics describing the various factors too... -Fred |
ISP was down yesterday.
Missed looking at the examples - just went and did so now. Big difference - my
chisel wear is circumferencial - not across the tire as shown in the toe-in
example. I'm getting chisel like wear *leading edge to trailing edge* of the
outside tread blocks on both edges of both front tires.
All the info I can find, mostly on truck tire sites, this is called heel and toe
wear, and is mostly a result of tread design and suspension design. Only
reference that I've found on tirerack site is that the Yoko's design has been
changed to try and reduce this. The OEM Michelins on the car had relatively
small tread blocks on the outside edges - no heel and toe problems. When I
upgraded to the Pilots, with larger outside tread blocks, I liked the better
handling, but now I've got the heel and toe problem showing up.
Frank
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