Tire Size Calculator
Compare different tire sizes and see how they affect your vehicle
Original Tire
New Tire
Enter Your Current Tire Size
Plus Size Options
Select an option to compare with your current tire size:
Comparison with Selected Size
225/45R17
245/40R18
24.7″
25.7″
Dimension | Original | Plus Size | Difference |
---|---|---|---|
Tire Size | 225/45R17 | 245/40R18 | – |
Diameter | 24.7″ | 25.7″ | +1.0″ (+4.0%) |
Width | 8.9″ | 9.6″ | +0.7″ (+8.9%) |
Circumference | 77.6″ | 80.7″ | +3.1″ (+4.0%) |
Speedometer Error | 0% | -4.0% | At 60 mph: 62.4 mph actual |
Plus Sizing Notes
- Plus sizing maintains a similar overall diameter while increasing rim size and decreasing sidewall height.
- The selected plus size tire is within 2% of your original tire’s diameter.
- A wider tire may require a wider wheel. Check manufacturer recommendations.
- Lower profile tires (smaller aspect ratio) generally provide better handling but may offer a firmer ride.
Tire Database Search
Search Results
Found 8 tires matching your criteria
Tire Details
Michelin Pilot Sport 4S
225/45R17
Rating:
(4.5)
$185.99
Specifications
Size: | 225/45R17 |
Type: | Performance Summer |
Load Index: | 94 |
Speed Rating: | Y (186 mph) |
UTQG: | 300 AA A |
Tread Depth: | 8.5/32″ |
Warranty: | 30,000 miles |
Performance Ratings
Dry Grip
9/10
Wet Grip
8/10
Comfort
7/10
Noise Level
7/10
Tread Life
8/10
Fuel Efficiency
6/10
Description
The Michelin Pilot Sport 4S is a max performance summer tire designed for sports cars, high-performance vehicles, and luxury sedans. It delivers exceptional steering precision and directional stability at high speeds, along with outstanding grip and braking performance on both wet and dry roads.
225/45R17
245/40R18
24.7″
25.7″
Results
Dimension | Original | New | Difference |
---|---|---|---|
Tire Size | 225/45R17 | 245/40R18 | – |
Diameter | 24.7″ | 25.7″ | +1.0″ (+4.0%) |
Width | 8.9″ | 9.6″ | +0.7″ (+8.9%) |
Circumference | 77.6″ | 80.7″ | +3.1″ (+4.0%) |
Sidewall Height | 4.0″ | 3.8″ | -0.2″ (-5.0%) |
Revolutions/Mile | 815 | 785 | -30 (-3.7%) |
Effect | Value | Description |
---|---|---|
Speedometer | -4.0% | Your speedometer will read slower than actual speed |
At 60 mph | 62.4 mph | Actual speed when speedometer shows 60 mph |
Ground Clearance | +0.5″ | Change in distance from ground to chassis |
Wheel Well Clearance | -0.2″ | Change in space between tire and wheel well |
Wheel Poke | +5mm | How much the wheel sticks out from the fender |
Fitment Notes
- The new tire is 4.0% larger in diameter, which may affect speedometer accuracy.
- The new tire is 8.9% wider, which may affect clearance in the wheel well.
- The new wheel has a 5mm different offset, which will change the wheel position relative to the fender.
- Always ensure proper clearance between the tire and suspension components, fenders, and wheel wells.