How do I read a tire size like 235/45R18?
The first number (235) is the tread width in millimeters. The second number (45) is the aspect ratio — the sidewall height as a percentage of the width. The “R” means radial construction, and the final number (18) is the wheel diameter in inches.
Where do I find my tire size?
Check the sidewall of your current tires, the sticker on the driver’s-side door jamb, the inside of the fuel-filler door, or your owner’s manual. You can also use Shop by Vehicle to look it up by year, make, model, and trim.
What do the speed rating and load index mean?
The load index is a number that corresponds to the maximum weight each tire can safely carry; the speed rating is a letter for the maximum safe speed. Always match or exceed the values your vehicle calls for on its door-jamb placard.
What do the P, LT, or ST prefixes mean?
P indicates a passenger (P-metric) tire, LT a light-truck tire, and ST a special-trailer tire. No letter usually means a Euro-metric tire. Match the service type your vehicle requires.
Can I put a different size on my vehicle?
Stick to your vehicle’s recommended size unless a qualified tire professional advises a proper “plus size.” Changing the width, aspect ratio, or wheel diameter affects speedometer accuracy, clearance, handling, and safety.
How much is shipping?
Shipping is a flat per-tire charge via FedEx Ground to all 50 states, shown at checkout before you pay — no hidden handling fees. Choose mobile installation where it’s available and there’s no shipping charge at all — we check your address at checkout. Tire prices are shown upfront.