Quote:
Originally Posted by juanmedina
we have 2 cars they are identical, they have the same power mods, same suspension mods, same everything but wheels and tires.
Car A: has some 18x9.5 wheels that weight 22 lbs and some 245/40/18 tires that weight 27 lbs
Car B: has some 17x8 wheels that weight 14 lbs and some 215/40/17 tires that weight 18 lbs.
**tires are the same brand and compound**
Which will win on Auto cross, how about road racing, and drag?
Idk I know one will more surface contact but the other will have less rotational mass.
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Code:
Stock Tire - 215/40R17
Tire 1 - 245/40R18
Section Width: 8.46 in 215 mm
Section Width: 9.64 in 245 mm
Rim Diameter: 17 in 431.8 mm
Rim Diameter: 18 in 457.2 mm
Rim Width Range: 7 - 8.5 in
Rim Width Range: 8 - 9.5 in
Overall Diameter: 23.77 in 603.75 mm
Overall Diameter: 25.71 in 653.03 mm
Sidewall Height: 3.38 in 85.852 mm
Sidewall Height: 3.85 in 97.79 mm
Radius: 11.88 in 301.75 mm
Radius: 12.85 in 326.39 mm
Circumference: 74.67 in 1896.6 mm
Circumference: 80.77 in 2051.5 mm
Revs per Mile: 875.0
Revs per Mile: 809.0
Actual Speed: 60 mph 100 km/h
Speedometer1: 55.4 mph 92.4 km/h
Speedometer Difference: - Speedometer Difference: 8.158% too slow
Diameter Difference: - Diameter Difference: 7.55%
Better driver wins, handsdown.