If you guys are so concerned about the smaller tire look at the track times for a SLK 32 which had smaller diameter tires. Yeah it had an advantage of about 19 hp and 22 torque but the times of that car are comparable with what some on here have gotten 107 or 108 mph in the low 13's and that is with a smaller diameter tire 17" and width 225 front and 245 rear and more hp and torque.

Here's a link to some SLK 32 times from MBWORLD.ORG - http://forums.mbworld.org/forums/sho...threadid=36250