Been thinking of some 18's

[Ldub]

That's my technical advice for you-- feel better now, Ldub???

Mmmmm...about the same......

285/75 x 18" = 34.83"...

Stock Tire - 245/70R16 >Search Tires Tire 1 - 285/75R18 >Search Tires
Section Width: 9.64 in 245 mm
Section Width: 11.22 in 285 mm

Rim Diameter: 16 in 406.4 mm
Rim Diameter: 18 in 457.2 mm

Rim Width Range: 6.5 - 8 in
Rim Width Range: Unrecognized tire size.

Overall Diameter: 29.50 in 749.3 mm
Overall Diameter: 34.83 in 884.68 mm

Sidewall Height: 6.75 in 171.45 mm
Sidewall Height: 8.41 in 213.61 mm

Radius: 14.75 in 374.65 mm
Radius: 17.41 in 442.21 mm

Circumference: 92.67 in 2353.8 mm
Circumference: 109.4 in 2778.7 mm

Revs per Mile: 705.0
Revs per Mile: 597.1

Actual Speed: 60 mph 100 km/h
Speedometer1: 50.8 mph 84.6 km/h

Speedometer Difference: - Speedometer Difference: 18.07% too slow
Diameter Difference: - Diameter Difference: 15.31%