Quote:
Originally Posted by PaulE
My '03 S came with the 18 inch 5 spoke Carrera Lightweight wheels. I also have set of 5 double spoke 17 inch wheels that were standard on the 2003 Boxsters. My 18 inch wheels have Michelin Pilot Sport PS2 N-3 tires, and the 17 inch wheels have Toyo Proxes T1 Sport tires. Interestingly, to me anyway, was that there was no real weight savings with the 17 inch wheels and tires compared to the 18s. 1 front 17 was 41.4 lbs vs 1 front 18 at 41.6 lbs. At the rear, 1 17 was 46.8 lbs and 1 18 was 48 lbs. The 17 inch tires were brand new, the 18s were not - 18,500 miles on the front tires and 5,700 miles on the rears, but still have lots of tread left on all of them. All of the tire sizes for the 17's and 18's were OEM stock. Not exactly apples to apples with different tire brands and one set being brand new and the other set not, but I think the bigger rubber on the 18's cancels out the weight savings on the lightweight Carrera wheels.
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My calculations are with using the same brand tire. Hankook v12. The 18 inch tires are only a pound or so heavier than the 17 inch ones according to Tire rack. Most of the weight savings in the wheels is on the rear ones.