Yokohama AVS ES100 Caution
06-26-2003, 04:45 AM
#25
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[QUOTE]Originally posted by mas
[B]
Same thing happened with the Toyo Proxes T1-S tires I got last year. The front is identical but the rear is at least 3/4 inch less contact patch compared to the OEMs. I was happy with the tires till I switced back to a borrowed set of wheels with the OEM tires - the difference was quite obvious! The car was much more stable at highway speeds with the S02s (even though they were worn). I could feel the difference the extra one inch of contact patch made.
IMO, the problem arises from installing a wider tire on the stock wheels - the tire sort of curves at the edges. The tire might have the same contact patch as the OEM tire on paper but after installing it on a narrower wheel you loose some contact patch. This is of cousre not going to be true for all tires since some tires have very square sidewalls and won't curve that much.
[B]
Same thing happened with the Toyo Proxes T1-S tires I got last year. The front is identical but the rear is at least 3/4 inch less contact patch compared to the OEMs. I was happy with the tires till I switced back to a borrowed set of wheels with the OEM tires - the difference was quite obvious! The car was much more stable at highway speeds with the S02s (even though they were worn). I could feel the difference the extra one inch of contact patch made.
IMO, the problem arises from installing a wider tire on the stock wheels - the tire sort of curves at the edges. The tire might have the same contact patch as the OEM tire on paper but after installing it on a narrower wheel you loose some contact patch. This is of cousre not going to be true for all tires since some tires have very square sidewalls and won't curve that much.
06-27-2003, 02:48 AM
#27
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I think everyone on the forum uses the terms in the same way - as the width of rubber touching the pavement. I always thought patch was in like square inches - the width of rubber touching the pavement multiplied by the front to rear measurement.
06-27-2003, 05:47 AM
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There is a bit of confusion I've seen:
* Width of tire (over all)- manufacturer's specs
* Width of contact patch - manufacturer's specs
* Actual width of contact patch - unmounted tire. This should be pretty much the same as the manufacturer's spcified contact patch width.
* Actual width of contact patch mounted on stock wheel at 32 psi. This is the most important number, IMO, and we can only get it by asking other owners or trying for ourself. Putting a paper under the tire is a good way, so is driving over dust/etc. In some cases, like with the Toyo's, not all the worn area touches the road when going straight and the rest of the wear you see is from driving thru curves (regular driving). So, just measuring the width of worn area does not give you a good number - you want the area that touches the road when going straight.
* Width of tire (over all)- manufacturer's specs
* Width of contact patch - manufacturer's specs
* Actual width of contact patch - unmounted tire. This should be pretty much the same as the manufacturer's spcified contact patch width.
* Actual width of contact patch mounted on stock wheel at 32 psi. This is the most important number, IMO, and we can only get it by asking other owners or trying for ourself. Putting a paper under the tire is a good way, so is driving over dust/etc. In some cases, like with the Toyo's, not all the worn area touches the road when going straight and the rest of the wear you see is from driving thru curves (regular driving). So, just measuring the width of worn area does not give you a good number - you want the area that touches the road when going straight.
07-03-2003, 07:45 AM
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Originally posted by Mrsideways
Be warned the ES100's are slippery when new. I had the most fun punching it in 3rd gear in a corner with mine and stepping it sideways for the first 200 miles or so. Now that I have about 1000 miles on them they are getting pretty grippy. Infact I have to try pretty hard to induce oversteer. I have a feeling they will get better for your soon robert.
Be warned the ES100's are slippery when new. I had the most fun punching it in 3rd gear in a corner with mine and stepping it sideways for the first 200 miles or so. Now that I have about 1000 miles on them they are getting pretty grippy. Infact I have to try pretty hard to induce oversteer. I have a feeling they will get better for your soon robert.
Becareful w/ Yoko's they are NOT S02's, not sticky at all, esp. new.
LT
