QSD,
Your reply on the aspect ratio is both right and wrong.
Let me explain: If you are comparing the same treadwidth to different aspect ratios, i.e.: 205/50 to 205/40, then yes, you are correct about less sidewall rubber between the rim and the road. However, if you were comparing 205/50 to a 235/45, then the 235/45 tire actually has MORE sidewall rubber between the rim and the road.
Scott
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