The Ultrac Vorti tires are Y speed rated (over 186mph), expected a stiffer sidewall then the W speed rated (lower) Hankook Ventus they replaced. Was suprised to find the UVs have a MORE compliant sidewall.

OE Michelin Latitude V speed rated runflat sidewalls were like a rock! And HEAVY!

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!