My Tire Guide

305/50R20 tire size

A 305/50R20 tire stands 32.0 inches tall and 12.0 inches wide, with a 6.0-inch sidewall on a 20-inch rim.

32.0″OVERALL 32.0 IN · RIM 20 IN12.0″6.0″WIDTH · SIDEWALL
Overall height
32.0 in813 mm
Section width
12.0 in305 mm
Sidewall height
6.0 in153 mm
Rim diameter
20 in508 mm
Circumference
100.6 in2554 mm
Revolutions per mile
630392 per km
Inch size
32.0x12.0R20

Compare it with any other size in the tire size calculator.

Sizes you can swap to

These 20-inch sizes are within two width steps and 3% of a 305/50R20's overall height, the usual limit before the speedometer, ABS and transmission notice. The closest is 285/55R20, 1.0% taller (0.33 in). Wider sizes also need room in the wheel well and a rim width that suits them.

SizeHeightWidthAt 60 mph
285/55R20+1.0%+0.33 in−20 mm60.6 mph
295/50R20−1.2%−0.39 in−10 mm59.3 mph
315/50R20+1.2%+0.39 in+10 mm60.7 mph
295/55R20+2.4%+0.77 in−10 mm61.4 mph
285/50R20−2.5%−0.79 in−20 mm58.5 mph
315/45R20−2.6%−0.85 in+10 mm58.4 mph

Plus and minus sizes

Changing rim size means changing the sidewall to keep the same overall height. On 18-inch or 19-inch or 21-inch or 22-inch rims, these are the closest matches to a 305/50R20.

SizeHeightWidthAt 60 mph
275/65R18+0.2%+0.07 in−30 mm60.1 mph
275/60R19−0.0%−0.02 in−30 mm60.0 mph
315/45R21+0.5%+0.15 in+10 mm60.3 mph
315/40R22−0.3%−0.09 in+10 mm59.8 mph

Other 20-inch sizes near 305/50R20

305 mm wide, other sidewalls

50 series, other widths

See the other sizes for this rim on 20-inch tire sizes.

Shop 305/50R20 tires

These open each store's own list of 305/50R20 tires, where you can filter by type, load and speed rating.

305/50R20 questions

How tall is a 305/50R20 tire?

About 32.0 inches (813 mm) from the ground to the top of the tread, unloaded. On the vehicle, carrying weight, it sits a little lower.

What does 305/50R20 mean?

305 is the section width in millimetres (12.0 in). 50 means the sidewall is 50% of that width: 153 mm, or 6.0 in. R means radial construction, and 20 is the rim diameter in inches.

Can I use 285/55R20 instead of 305/50R20?

285/55R20 is 1.0% taller (0.33 in) and 20 mm narrower, which is inside the usual 3% rule. With it fitted, the speedometer shows 60 mph when you are doing 60.6 mph.

What is 305/50R20 in inches?

In inch terms it is 32.0x12.0R20: 32.0 inches tall, 12.0 inches wide, for a 20-inch rim.

How many revolutions per mile does a 305/50R20 make?

About 630 turns per mile, worked out from its unloaded circumference of 100.6 inches. Makers list slightly higher numbers for their own tires, because a loaded tire rolls on a smaller radius.