Fitment
Going up a tire size: what fits, what it changes, and how to choose the right load range.
Compare33s vs 35s vs 37sWhat each step up changes: weight, gearing, speedometer, fuel economy and lift.
Guide + calculatorRegearing for bigger tiresWork out the axle ratio that restores your gearing on 35s or 37s, and see what the factories choose.
GuideTire load range explainedWhat C, D and E mean, what they don’t change, and how load range matters when you air down.
CalculatorTire size calculatorCompare any two sizes, metric or flotation, and see your speedometer error.