My Tire Guide

245/45R20 tire size

A 245/45R20 tire stands 28.7 inches tall and 9.6 inches wide, with a 4.3-inch sidewall on a 20-inch rim.

28.7″OVERALL 28.7 IN · RIM 20 IN9.6″4.3″WIDTH · SIDEWALL
Overall height
28.7 in729 mm
Section width
9.6 in245 mm
Sidewall height
4.3 in110 mm
Rim diameter
20 in508 mm
Circumference
90.1 in2289 mm
Revolutions per mile
703437 per km
Inch size
28.7x9.6R20

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 245/45R20's overall height, the usual limit before the speedometer, ABS and transmission notice. The closest is 225/50R20, 0.6% taller (0.18 in). Wider sizes also need room in the wheel well and a rim width that suits them.

SizeHeightWidthAt 60 mph
225/50R20+0.6%+0.18 in−20 mm60.4 mph
265/40R20−1.2%−0.33 in+20 mm59.3 mph
235/45R20−1.2%−0.35 in−10 mm59.3 mph
255/45R20+1.2%+0.35 in+10 mm60.7 mph
235/50R20+2.0%+0.57 in−10 mm61.2 mph
255/40R20−2.3%−0.65 in+10 mm58.6 mph
265/45R20+2.5%+0.71 in+20 mm61.5 mph
225/45R20−2.5%−0.71 in−20 mm58.5 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 245/45R20.

SizeHeightWidthAt 60 mph
225/60R18−0.2%−0.05 in−20 mm59.9 mph
245/50R19−0.1%−0.04 in±0 mm59.9 mph
245/40R21+0.1%+0.04 in±0 mm60.1 mph
245/35R22+0.2%+0.07 in±0 mm60.1 mph

Other 20-inch sizes near 245/45R20

245 mm wide, other sidewalls

45 series, other widths

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

Shop 245/45R20 tires

These open each store's own list of 245/45R20 tires, where you can filter by type, load and speed rating.

245/45R20 questions

How tall is a 245/45R20 tire?

About 28.7 inches (729 mm) from the ground to the top of the tread, unloaded. On the vehicle, carrying weight, it sits a little lower.

What does 245/45R20 mean?

245 is the section width in millimetres (9.6 in). 45 means the sidewall is 45% of that width: 110 mm, or 4.3 in. R means radial construction, and 20 is the rim diameter in inches.

Can I use 265/40R20 instead of 245/45R20?

265/40R20 is 1.2% shorter (0.33 in) and 20 mm wider, which is inside the usual 3% rule. With it fitted, the speedometer shows 60 mph when you are doing 59.3 mph. Make sure the extra width clears the suspension and fender liner at full lock.

What is 245/45R20 in inches?

In inch terms it is 28.7x9.6R20: 28.7 inches tall, 9.6 inches wide, for a 20-inch rim.

How many revolutions per mile does a 245/45R20 make?

About 703 turns per mile, worked out from its unloaded circumference of 90.1 inches. Makers list slightly higher numbers for their own tires, because a loaded tire rolls on a smaller radius.