Fitment tools
Wheel & tire size guide
Enter your vehicle and the wheel specs you're considering. We'll show how they sit compared to factory, recommend tire sizes, and list in-stock wheels that fit.
Wheel setup
Wheel specs
How do I read wheel specs?
Diameter x width: a 19x9.5 wheel is 19 inches across and 9.5 inches wide.
Offset (ET): how far the mounting face sits from the wheel’s centerline, in millimeters. A lower offset pushes the wheel out toward the fender; a higher offset pulls it in toward the suspension.
Square vs staggered: square means the same size on all four corners (and you can rotate tires). Staggered runs wider wheels in the rear for a more aggressive stance and grip.
Your fitment results will show up here
Pick your vehicle and we’ll load its factory wheel specs as a starting point. Change the diameter, width and offset to the wheels you’re considering, then press Check fitment.
Tire size calculator
Compare two tire sizes
See how a new tire size changes overall diameter, sidewall height and your speedometer reading.
Format: width/aspect R diameter, e.g. 275/30R20.
| Current | New | Diff |
|---|
Tire basics
How to read a tire size
- 245
- Section width in millimeters, sidewall to sidewall.
- 40
- Aspect ratio: sidewall height is 40% of the width (98mm here).
- R
- Radial construction, used on virtually every modern car tire.
- 18
- Wheel diameter in inches. It must match your wheel exactly.
- 97W
- Load index (97 = 1,609 lb per tire) and speed rating (W = 168 mph). Match or exceed your factory rating.
Plus-sizing reference
Common sizes that keep a similar overall diameter as you go up in wheel size. Always confirm clearance for your car.
| Factory size | +1 inch | +2 inches | +3 inches |
|---|---|---|---|
| 225/45R17 (25.0″) | 225/40R18 (25.1″) | 235/35R19 (25.5″) | 245/30R20 (25.8″) |
| 235/45R18 (26.3″) | 245/40R19 (26.7″) | 255/35R20 (27.0″) | 265/30R21 (27.3″) |
| 245/40R19 (26.7″) | 255/35R20 (27.0″) | 265/30R21 (27.3″) | 275/25R22 (27.4″) |
| 255/55R18 (29.0″) | 255/50R19 (29.0″) | 275/45R20 (29.7″) | 285/40R21 (30.0″) |
| 265/65R18 (31.6″) | 275/55R20 (31.9″) | 285/45R22 (32.1″) | – |
Rather have us check it?
Send us your year, make, model and the wheel you like. We’ll confirm fitment before you order.
