What does 305/30R21 mean?

305 is the section width in millimeters, 30 is the sidewall height as a percent of that width (92 mm here), R means radial and 21 is the wheel diameter in inches. Overall the tire stands 28.2 inches tall.

Will 305/30R21 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 305/30R21?

The tire makers list 7 to 12 inch rim widths across the 305 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.

305/30R21 tires

6 tire lines. 305/30R21 tires sized to your wheels and your car.

About 305/30R21 tires

A 305/30R21 is 305 mm wide with a 92 mm sidewall (30 series) on a 21 inch wheel, 28.2 inches tall overall. A tire size only makes sense next to a wheel width and a car. 305/30R21 mounts on a range of widths, and the overall height decides whether the speedometer and the fender stay happy.

6 lines carry 305/30R21, from 3 brands (Continental Tire, Michelin and Pirelli). By type that is 4 performance summer and 2 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 305/30R21 lines that do both.

Common questions

What does 305/30R21 mean?: 305 is the section width in millimeters, 30 is the sidewall height as a percent of that width (92 mm here), R means radial and 21 is the wheel diameter in inches. Overall the tire stands 28.2 inches tall.
Will 305/30R21 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 305/30R21?: The tire makers list 7 to 12 inch rim widths across the 305 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.