275/45R20 vs 245/45R20

275/45R20 vs 245/45R20: Comparision Size Chart


275/45R20 (Tire 1)245/45R20 (Tire 2)Difference
Tire Size In Inches29.8X10.8R2028.7X9.6R20
Diameter29.74"755.5 mm28.68"728.5 mm-3.57%
Tread Width10.8275 mm9.6"245 mm-10.91%
Rim Diameter20"508 mm20"508 mm0%
Sidewall Height4.87"123.75 mm4.34"110.25 mm-10.91%
Circumference93.43"2373.47 mm90.1"2373.47 mm-3.57%
Revs/Mile678.15 Revs/Mile703.22 Revs/Mile+25.07
Revs/Kilometer421.38 Revs/Mile436.96 Revs/Mile+15.58
Tire 1 Front View
10.8"
29.74"
Tire 2 Front View
10.8"
28.68"
Tire 1 Side View
Tire 1 Wheel
Circumference 1
93.43"
20"
4.87"
678.15 Revs/Mile
Tire 2 Side View
Tire 2 Wheel
Circumference 2
90.1"
20"
4.34"
703.22 Revs/Mile

Speedometer Error

275/45R20 (Mph)245/45R20 (Mph)
2019.29
3533.75
5048.22
6562.68
8077.14
9086.79
10096.43

245/45R20 vs 275/45R20: Gas Mileage & Performance Comparison

* Below is a comparison table. Assuming 2 tires of the same manufacturer, material and tested on the same road conditions.

275/45R20245/45R20
Wet/Snowy RoadsReduced TractionBetter Traction
Rough TerrainSmoother RideReduced Stability
Handling/SteeringBetterLess Responsive
Gas MileageBetterGood
Road NoiseQuietQuieter
CostMore ExpensiveLess Expensive

Can You Replace The 275/45R20 With The 245/45R20?

No, both tires have the same rim diameter, but the 245/45R20 has a smaller overall diameter than the 275/45R20 which is -3.71% (1.06-inch).

When you want to replace a different tire size, as a rule, for the rim diameter, you will need to be sure that your tires and rims are an exact match, e.g. a 275/45R20 tire will only fit on a 20″ diameter rim.

You Can check our tools and charts below to find your size:

*Disclaimer: The information provided on the tire size is for general informational purposes only. We recommend that you consult a certified tire specialist or National Highway Traffic Safety Administration (NHTSA) sets specific guidelines for tires used on vehicles.


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Jamie Hicks

Sullivan Kane

Tire Technician at TireSizesCalculator

Sullivan is a Tire Technician specializing in tire repair at TireSizesCalculator. With over 6 years of experience in the industry, Sullivan has become an expert in tire repair, maintenance & installation.


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