255/40R21 tires

About 255/40R21 tires

255/40R21 means a 255 mm section width, a sidewall 40 percent of that (102 mm) and a 21 inch rim, which works out to 29 inches tall. Whether 255/40R21 works comes down to the wheel width it mounts on and how far it lands from the height the car left the factory with.

17 lines carry 255/40R21, from 7 brands (Michelin, Continental Tire, Pirelli, Toyo and 3 more). By type that is 8 performance summer and 8 all season. The tire has to stay near your car's stock height and mount on your wheel width, so pick the car and the wheel set and the page keeps only the 255/40R21 lines that do both.

Common questions

What does 255/40R21 mean?

255 is the section width in millimeters, 40 is the sidewall height as a percent of that width (102 mm here), R means radial and 21 is the wheel diameter in inches. Overall the tire stands 29 inches tall.

Will 255/40R21 fit your car?

Pick your year, make and model and the tires page answers it for yours. The wheel width has to carry the section width and the overall height has to stay near where the car started.

What wheel width fits 255/40R21?

The tire makers list 6.5 to 11 inch rim widths across the 255 mm sizes we carry, and each product page shows the range for that line. Pick a 21 inch wheel set and the tire step checks the width for you.