305/70R17 vs 315/70R17

305/70R17 vs 315/70R17: Comparision Size Chart


305/70R17 (Tire 1)315/70R17 (Tire 2)Difference
Tire Size In Inches33.8X12R1734.4X12.4R17
Diameter33.81"858.8 mm34.36"872.8 mm1.63%
Tread Width12305 mm12.4"315 mm3.28%
Rim Diameter17"431.8 mm17"431.8 mm0%
Sidewall Height8.41"213.5 mm8.68"220.5 mm3.28%
Circumference106.22"2698 mm107.95"2698 mm1.63%
Revs/Mile596.5 Revs/Mile586.94 Revs/Mile-9.5599999999999
Revs/Kilometer370.65 Revs/Mile364.71 Revs/Mile-5.94
Tire 1 Front View
12"
33.81"
Tire 2 Front View
12"
34.36"
Tire 1 Side View
Tire 1 Wheel
Circumference 1
106.22"
17"
8.41"
596.5 Revs/Mile
Tire 2 Side View
Tire 2 Wheel
Circumference 2
107.95"
17"
8.68"
586.94 Revs/Mile

Speedometer Error

305/70R17 (Mph)315/70R17 (Mph)
2020.33
3535.57
5050.82
6566.06
8081.3
9091.47
100101.63

315/70R17 vs 305/70R17: Gas Mileage & Performance Comparison

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

305/70R17315/70R17
Wet/Snowy RoadsBetter TractionReduced Traction
Rough TerrainReduced StabilitySmoother Ride
Handling/SteeringLess ResponsiveBetter
Gas MileageGoodBetter
Road NoiseQuieterQuiet
CostLess ExpensiveMore Expensive

Can You Replace The 305/70R17 With The 315/70R17?

Yes, both tires have the same rim diameter, and the 315/70R17 has a bigger overall diameter than the 305/70R17 which is only 1.6% (0.55-inch), it is the allowable margin (±3%).

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 305/70R17 tire will only fit on a 17″ 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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