Are you referring to the .3" diff there is between the two tire/wheel combos or just wheels. Wheels are a full 3". I'll just tell you that I lost a consistent 1 mph in trap speed when I switched to 3 lbs. lighter, yet 1" larger (17") wheels. I say dyno both and you'll see for yourself, all you have to do is replace the drive wheels in between runs. That should about end this neverending debate on wheel size vs. weight that we've had going on for a while now. Pleeaassseeeee....
