Quote:
Originally Posted by PRAY
Let me clarify what I am saying. If you run enough mph to have to shift to 5th gear in the 1/4 for any reason then you need to go DOWN on tire size. Especially if you are running a radial. Since we have no rear gear selection for these cars besides a 3.73 then you need to run what ever tire size will get you as close to 6,500 in 5th at the stripe to maximize your 1/4 times. Deeper or shorter is quicker when you have to execute 4 shifts. The stock tire height is labeled at 27.5" which we have beaten to death in the past. The tire is 26.83" on the car. So any tire over that height when sitting on the car is only hurting you when you eclipse that 114-120mph range depending on tire height you chose. I think 120 is it at 6,500 in 4th with a 30" radial. I can't see a 30" radial helping you 60fts at all. I went from 27psi to 18psi in my tires and dropped .03 off of my 60ft. Slicks are a little different since you can shrink them on the line with air pressure and get some growth back up top.
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So using my old 5th Gen DR's that are 305/45-18 (28.8") on the 6th Gen A10 that are 26.7" would not be a good idea?
I guess go with the 305/35 which matches up better with the stock front 285/30-20 at 26.7"
Assuming I leave them on and just swap rears.
