[macperry]

I have a 2007 GT/CS with the stock 18" rims. I put some Nitto 555R 305/45R18 drag radials on the rear. They fit and look great....but my 1/4 mile times are worse now than with the stock tires. I was told that the best rim size for drag racing applications are a 15" rim. Any opinions out there?

[jim293]

How often do you race this car? If you do not race it that often I would not worry about it.

[macperry]

I race the car at least 3 times a week. I'm getting frustrated because the dyno numbers and my times definitely don't match. Everyone at the track seems to think that the 4:30 gears and the 18" rim combination are definitely the problem.

[DONTLIKEYOU]

I have 15's on my 07 it took some work to make them fit the rear but i love them

[roberto31]

Tell me you didn't mount the 305's on the stock rims.

[Stoenr]

were your 60' any better with the drags on?
the taller tire is offsetting the gears a little. So something like it ='s out to a 4.10 gear.