Diameter Difference: 1.24% (25.40in vs 25.72in)
For 235/40R18 vs 245/40R18, the diameter difference is 1.24% (25.40in vs 25.72in).
Diameter Difference
1.24% (25.40in vs 25.72in)
Formula
Diameter = Rim + 2 × (Width × Aspect Ratio ÷ 100 ÷ 25.4). A larger diameter makes your speedometer read slower than actual speed.
Frequently Asked Questions
What is the diameter difference for 235/40R18 vs 245/40R18?
1.24% (25.40in vs 25.72in).