225/40R18 vs 235/45R18: Gas Mileage & Performance Comparison
* Below is a comparison table. Assuming 2 tires of the same manufacturer, material and tested on the same road conditions.
|Wet/Snowy Roads||Reduced Traction||Better Traction|
|Rough Terrain||Smoother Ride||Reduced Stability|
|Cost||More Expensive||Less Expensive|
Can You Replace The 235/45R18 With The 225/40R18?
No, both tires have the same rim diameter, but the 225/40R18 has a smaller overall diameter than the 235/45R18 which is -4.94% (1.24-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 235/45R18 tire will only fit on a 18″ diameter rim.
You Can check our tools and charts below to find your size: