Tire Size Comparison Calculator

Thinking about a different tire size? Compare two tires side by side and see exactly how they differ. Enter metric or standard sizes and check the change in overall diameter, width, sidewall height, and how far the swap throws off your speedometer.

Original:

Tire Size Unit

265/70R17 · 31.5X10.5R17

New:

Tire Size Unit

325/55R20 · 34X13R20

Comparison Results

Height Difference

2.47"

(62.7mm)

The new tire is 7.81% taller

Width Difference

2.36"

(60.0mm)

The new tire is 22.64% wider

Speedometer Error

+7.81%

The new tire will cause the speedometer to read slower than actual speed

Indicated → Actual Speed:

25 mph → 27.0 mph

45 mph → 48.5 mph

70 mph → 75.5 mph

Shop 325/55R20 Tires Open in Fitment Visualizer

902 Paramount Pkwy, Unit A

Batavia, IL 60510

Phone: +1-877-205-5858

*Location not open to the public*

info@tirewheelexperts.com