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      06-02-2012, 06:46 PM   #4
First Lieutenant

Drives: A4 quattro 3.2 MT6; E92 6MT
Join Date: Mar 2012
Location: Boston

iTrader: (0)

Originally Posted by kmarei View Post
Thanks for this and your many other helpful posts I've read while researching & prepping this car!

Here's what I found (thanks, tirerack!):
245/35-19 PS2: load index 93(XL) @ 33 PSI = 1178
265/35-19 PS2: load index 98(XL) @ 35 PSI = 1430

275/35-18: load index 95(SL) @ 26/27 PSI = 1164/1199
275/35-18: load index 95(SL) @ 33/34 PSI = 1407/1443

Note that the Dunlop Direzza Sport Z1 Star Spec have SL load range, whereas the Michelin Pilot Sport PS2 have XL load range. Therefore, I used your chart to get the load for the PS2's, but the chart I posted later in that thread to find the PSI for the SS.

So, it looks like I should be running 26/34 F/R on my Star Spec square setup. I'm a bit surprised at the bias. I think I'll actually do something closer to 29/32, since I'm guessing some of that bias was to give the front tires a larger contact patch for a bit more bite. Switching to 275's should reduce the need for that and I wouldn't mind a slightly larger contact patch in the rear.

I'll also be keeping an eye on how the tread wears.

Last edited by Drifty//; 06-02-2012 at 07:07 PM. Reason: Fixed to use SL chart for Z1 SS tires