At those speeds you need more psi in the tires. Straight off the Michelin web site for the Pilot Super Sport.
For high-speed driving, additional inflation pressure and possibly reduced tire loading and/or upsizing is required. In the absence of specific recommendations by the vehicle manufacturer, use the following guidelines based on those in the European Tyre and Rim Technical Organization Standards Manual.
For speeds over 160km/h (100 mph), load and inflation must be adjusted according to the table below.
(Y)-Speed Rated Sizes:
Maximum Speed (mph) 118 124 130 136 143 149 155 161 168 174 180 186
Inflation Increase (psi) 0 0 0 0 1.5 3 4.5 6 7.5 7.5 7.5 7.5
Load Capacity (% of max) 100 100 100 100 100 100 100 100 100 95 90 85
Quote:
Originally Posted by ex-SS-ve
I noticed the same thing at high speeds. Bumped up cold pressure to 36 as dealer had them at 28. Problem solved.
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You have it right! At least to 155 or so.
