Heh... you said "underwear"...
Regards,
Jon "Always Adding Helpful Dialog To A Topic" Heese
Ron Porter wrote:
> <snip>
>
> It does NOT cause "aggressive shoulder wear, "under" wear in the center of
> the footprint, an offset footprint, and carcass deformation (which can lead
> to separation)". In a similar vein, my current 215/45/17s on a 17x7.5" rim
> are nicely worn evenly across after four very hard track days, and 20K+ road
> miles
>
> Ron Porter
>
>
> -----Original Message-----
> From: FlamingTaco [mailto:flamingtaco@earthlink.net]
> Sent: Tuesday, July 25, 2006 5:21 PM
> To: ronporter@ameritech.net; shotimes@autox.team.net
> Subject: RE: [Shotimes] Thoughts on Kumho Ecsta 711s
>
> I'm not too familiar with yokohama, but your own findings match what you'll
> see if you look through BFG/Goodyear/Michelin et al. The recommended tire
> width for the ES 100 225/50-16 is not a MINIMUM 7", but a NOMINAL 7". IOW,
> the tires were designed to be mounted on a 7" rim. The MAXIMUM range for the
> tires is 6-8".
>
> Your "improvement" is due to gaining more section width by forcing the
> carcass to push the shoulders towards the foot-print. There are trade-offs
> in doing this, though, namely agressive shoulder wear, "under" wear in the
> center of the footprint, an offset footprint, and carcass deformation (which
> can lead to separation).
>
> While I'm not against using extreme tire/wheel combinations for track use, I
> will not recommend mounting a tire at either extreme of it's recommended
> range for a daily driver, be it warranteed or not. 1/2" either side of
> nominal is the max one should go with to preserve longevity and the tire's
> designed performance parameters.
>
> I have seen enough "periodically tracked" 6-8" range tires mounted on 8"
> rims separate or blow the sidewall to know that mounting a tire at it's
> extremes, then driving it to it's extremes is pushing the tire too far. Not
> so many problems with vehicles seeing street-only use, but many shops do not
> like mounting 225's less than 60 on anything wider than 7.5". Since they are
> under pressure to limit failure returns, I've got to put some credence in
> their experiece as well.
>
> David
>
>
>
> -----Original Message-----
>> From: Ron Porter <ronporter@ameritech.net>
>> Sent: Jul 25, 2006 4:08 PM
>> To: shotimes@autox.team.net
>> Subject: RE: [Shotimes] Thoughts on Kumho Ecsta 711s
>>
>> Nope. I first learned this a few years back on the 911, when I went from
> the
>> 245/45/16 on 16x8 rims (I bought it with that) to a 225/50/16 on those
> rims.
>> EVERYTHING improved.
>>
>> Look at the specs for most 225 50 or 55 tires. Tread widths are around 8",
>> and the spec rim will be at least 7", with a 7-9" rim range.
>>
>> An 8" rim is the best for a 225 tire from my experience, just as the 7.5"
>> rim is perfect for the 215/45 tires I run now.
>>
>> As an example, a typical S tire is the ES100 Yoko, I either 225/50 or
> 225/55
>> size. Here's the Tire Rack specs:
>>
>> 225/50 WR16
>> 92W SL 280 AA A
>> 1389 lbs.
>> 44 psi
>> 10/32"
>> 23 lbs.
>> 6-8"
>> 7"
>> 8.9"
>> 8.3"
>> 25"
>> 829
>>
>> 225/55 WR16
>> 95W SL 280 AA A
>> 1521 lbs.
>> 44 psi
>> 10/32"
>> 24 lbs.
>> 6-8"
>> 7"
>> 9.1"
>> 8.3"
>> 25.8"
>> 805
>>
>> The design spec rim is 7", but the tread width is 8.3", with a rim
>> recommendation of 6-8". I can tell you that the 225/55 does not work very
>> optimally on a 6" slicer. 7" is fine, but 8" is the optimal for handling.
>>
>> Ron Porter
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