What Tire Size Do I Need?
Those numbers on your tire — like 225/45R17 — tell you exactly what fits your car. Here's what each part means and where to find your size. Or skip the homework: snap a photo of your sidewall and text it to us — we'll read it and quote you in minutes.
How to read your tire size
Let's decode a common size — 225/45R17 94V:
225
WidthThe width of the tire in millimeters, measured across the tread. Bigger number = wider tire.
45
Aspect ratioThe sidewall height as a percentage of the width. A 45 means the sidewall is 45% as tall as the tire is wide — lower numbers look sportier, higher numbers ride softer.
R
Construction"R" means radial — how the tire is built inside. Nearly every modern car tire is radial.
17
Wheel diameterThe diameter of the wheel (rim) the tire fits, in inches. This one fits a 17-inch wheel.
94
Load indexA code for how much weight the tire can safely carry. Match or exceed what your car calls for.
V
Speed ratingThe top safe speed for the tire. Stick with the rating your vehicle was built for.
Where to find your tire size
📍 The tire sidewallThe fastest spot. Look at the outer wall of any current tire for a string like 225/45R17. That's your size.
📍 The driver's door jambOpen the driver's door and look for a white/yellow sticker on the frame. It lists the factory tire size and the correct air pressure.
📍 Your owner's manualThe tire and wheel section lists your original equipment (OEM) size and any approved options.
📍 Inside the fuel door or gloveboxSome vehicles print the tire placard here instead of the door jamb.
Still not sure? Let us do it
You don't need to figure any of this out alone. Send us a photo of your tire's sidewall or just your year, make and model by text, and we'll confirm the exact size, check what's in stock, and send you an honest, upfront price — new or used. Same-day installation at both LA locations.