An online calculator will often be wrong, since they don't calculate real world variables (like load on the tire, etc.). The best way is to find the revs per mile either on Tire Rack.com or the tire manufacturer's website. I think the stock Perellis are 768 revs per mile.
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2006 Mustang GT
5 Speed Auto
NOS Single Port Wet Nitrous Kit (75 shot)
93 Octane tune from Bama Chips
FRPP 3.73:1 Gears
Steeda Intake
Steeda LCA/Eibach Sway Bars
FRPP "Stinger" Axle Back Exhaust
BBK Shorty Headers
19 lbs OZ Racing Wheels with 255/45R18 Tires
Daily Driver: 2009 Pontiac G8 GT
Last edited by mustangtestuser; 06-05-2009 at 04:23 PM.
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