All 305/40R20 tires

305/40R20 is also written 305 40 R20, 305/40 R20, 305 40 20 or 3054020. 305 is the tread width in millimetres, 40 the aspect ratio (sidewall height as a percentage of the width), R stands for radial construction, and 20 the rim diameter in inches.

A 305/40R20 tire is about 752.0 mm (29.6 in) tall, with a sidewall of 122.0 mm.

An equivalent size is a tire whose overall diameter stays within 3% of 305/40R20, so the speedometer, gearing and wheel-well clearance stay close to what the vehicle was designed for. People look for one when 305/40R20 is scarce or expensive, or when they want a different width or rim size. An equivalent size is not an automatic swap, and we do not guarantee that it fits your vehicle: check the rim width range, make sure the load index is at least the original, and allow for possible rubbing. Add your car above and rely on the “Fits on your vehicle” label shown on each product to confirm the fit.

• 245/55R19+0.01% · 19"chevron_right
• 245/50R20+0.13%chevron_right
• 275/40R21+0.19% · 21"chevron_right
• 245/45R21+0.25% · 21"chevron_right
• 315/35R21+0.25% · 21"chevron_right
• 275/45R20+0.47%chevron_right

Sidewall 122.0 mm, overall diameter 752.0 mm (29.6 in), circumference 2362.5 mm, 423.3 revolutions per km.

Read the full guide

305/40R20 tires start at $205.70 at PMC Tire. We list 32 tires in this dimension.

It depends on the exact vehicle and trim. Add your car above to check which tires in this size fit it.

In Quebec, winter tires are mandatory from December 1 to March 15, and only tires with the three-peak mountain snowflake symbol qualify. Our guide explains how to choose. Read the full guide

We carry 305/40R20 tires from 14 brands, including Pirelli, Michelin, Bridgestone, Hankook, Continental, Nokian Tyres, Vredestein, Yokohama.