245/45R17 vs 255/40R17: Gas Mileage & Performance Comparison
* Below is a comparison table. Assuming 2 tires of the same manufacturer, material and tested on the same road conditions.
| 255/40R17 | 245/45R17 | |
| Wet/Snowy Roads | Better Traction | Reduced Traction |
| Rough Terrain | Reduced Stability | Smoother Ride |
| Handling/Steering | Better | Less Responsive |
| Gas Mileage | Good | Better |
| Road Noise | Quiet | Quieter |
| Cost | Less Expensive | More Expensive |
Can You Replace The 255/40R17 With The 245/45R17?
Yes, both tires have the same rim diameter, and the 245/45R17 has a bigger overall diameter than the 255/40R17 which is only 2.53% (0.65-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 255/40R17 tire will only fit on a 17″ diameter rim.
You Can check our tools and charts below to find your size:
