Blue C5 wrote:
> On Nov 25, 7:28 am, Bob I > wrote:
>> Remember, old tires are noisier than new tires. So ask folks what "OLD"
>> tires they have been happiest with.
>>
>> Joe wrote:
>>> Bought a 98 vette. Has toyo tires. They seem quite loud over the highway. Is
>>> this a known issue? My first vette.Suggestions on replacements. Thanks Joe
>
> My old Michelin ZPs are quieter than the Goodyears. The noticeable
> difference is in the increase in tire pressure as the tire gets hot.
> The Michelins will go up about 4 lbs - Goodyears were about 3. ZPs
> may be a softer tire but I am guessing. I put nitrogen in the
> Michelins (had air as well - hard to evacuate them) and the pressure
> change dropped to about 3.
>
> I don't autocross any more so I can't speak to handling - just
> cruising.
>
> Bob C3/C4/C5

I'd guess the temp increase difference is due to more flexible side
walls on ZP's. In reality, air is nearly 4/5's nitrogen, so adding in 2
atmospheres of nitrogen, you are down to 7% O2. I'd worry more about
moisture as the big pressure changer due to temperature increases.