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Uno Dei Molti Porschisti
Join Date: Feb 2004
Location: Elfin Forest, CA
Posts: 332
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Car was in shop a bit longer than expected... I'm not sure how you measured your tire's OD... By calculation the Kuhmo Ecsta XS 265/45-16 OD is 25.39in (16 + [2 x 265 x 0.45/25.4]); by measurement I got a tad under 25-1/2in on the horizontal diameter. Ditto the tread width measures within a mm or so of the 265mm nominal value (I got a tad over 10-3/8in). The fronts (225/50-16) also measured out at the nominal values.
The maximum width (i.e., including sidewall bulges) measured out at just less than 10-5/8in (axle height) to a max of ≈11in near contact patch for the 265 on 9-in rims at 33psi, and likewise 10in to 10-1/2in for the 225 (on 7-in rims) at 32psi.
Cheers
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85 Carrera Coupe, OBD-I 993 3.6 conversion (bottomless list of mods)—425k+ miles. 100k on the 3.6, zero blue smoke, but oh the leaks... two broken 915s  But G50 and all the other bits going in early 2024 
Consolation & stealth vehicle: 05 Mercedes E55 AMG S211 "No one will suspect the Spa... silver station wagon".
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