315/35R20 vs 305/35R20: Gas Mileage & Performance Comparison
* Below is a comparison table. Assuming 2 tires of the same manufacturer, material and tested on the same road conditions.
| 305/35R20 | 315/35R20 | |
| Wet/Snowy Roads | Better Traction | Reduced Traction |
| Rough Terrain | Reduced Stability | Smoother Ride |
| Handling/Steering | Less Responsive | Better |
| Gas Mileage | Good | Better |
| Road Noise | Quieter | Quiet |
| Cost | Less Expensive | More Expensive |
Can You Replace The 305/35R20 With The 315/35R20?
Yes, both tires have the same rim diameter, and the 315/35R20 has a bigger overall diameter than the 305/35R20 which is only 0.96% (0.27-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 305/35R20 tire will only fit on a 20″ diameter rim.
You Can check our tools and charts below to find your size:
