Tire Size Calculator

Enter your wheel diameter and width, choose how you want the tire to sit, and get the sizes that fit — front and rear. Tuned for performance and track fitments, not just OEM replacements.

Suggestions are a starting point — confirm fitment with a certified installer before buying.

How wheel width translates to tire size

A tire's section width should be roughly rim width × 28 mm for a clean "flush" fit — i.e. the rim is about 90% of the tire's section width. An 11" wheel lands near a 305–315; a 9" wheel near a 255–265. From there, going one or two sizes narrower gives a stretched look, and wider gives a fuller, more planted wide fit.

Stretched vs. flush vs. wide

Stretched pulls a narrower tire onto a wide wheel (aggressive sidewall angle, common in stance builds). Flush is the balanced match most performance and track setups want — full contact patch, predictable sidewall. Wide mounts a fatter tire for maximum grip, at the cost of some sidewall bulge.

What about aspect ratio?

Leave the aspect box on any and we pick a sidewall that keeps overall diameter sensible (about a 3.5" sidewall). Enter a number to lock it — useful if you're matching an existing setup's rolling diameter.

Then find them in stock

Once you've got your sizes, search them on FindPerformanceTires to see which performance and track tires are actually available across vendors — filtered by treadwear, with complete front + rear sets.