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245/70R17 vs 265/60R18 tire size comparison

245/70R17265/60R18

265/60R18 is 0.02 in (0.05%) taller than 245/70R17 and 0.8 in wider. They fit different wheels: 245/70R17 a 17-inch wheel and 265/60R18 an 18-inch wheel.

245/70R17 and 265/60R18 side by side

0.0 in / +0.05%245/70R17: 30.5 in tall, solid line265/60R18: 30.5 in tall, dashed line245/70R17Width 9.6 in (245 mm)Sidewall 6.8 in (172 mm)265/60R18Width 10.4 in (265 mm)Sidewall 6.3 in (159 mm)
245/70R17 is drawn with a solid line and 265/60R18 with a dashed line. In each drawing both tires are to the same scale; the tread shoulder and bead curves are simplified. The table below has the same numbers.
Dimensions of 245/70R17 and 265/60R18, with the difference (265/60R18 minus 245/70R17)
Measurement245/70R17265/60R18DifferenceDifference %
Section width9.6 in (245 mm)10.4 in (265 mm)+0.8 in (+20 mm)+8.16%
Sidewall height6.8 in (172 mm)6.3 in (159 mm)-0.5 in (-13 mm)-7.29%
Wheel (rim) diameter17.0 in (432 mm)18.0 in (457 mm)+1.0 in (+25 mm)+5.88%
Overall diameter30.5 in (775 mm)30.5 in (775 mm)0.0 in (0 mm)+0.05%
Circumference95.8 in (2434 mm)95.9 in (2435 mm)+0.1 in (+1 mm)+0.05%
Revolutions per mile6616610-0.05%

Differences are 265/60R18 minus 245/70R17; percentages are relative to 245/70R17. These are nominal design dimensions. Real tires vary by brand, tread depth, wheel width, load and pressure.

The overall diameter differs by 0.05%, which is within the common 3% rule of thumb.

The rule of thumb keeps a replacement size within about 3% of the original overall diameter. It covers diameter only. It is not a fit, load or safety check, because width, wheel diameter, load capacity and clearance matter too. Confirm any size change with your vehicle's owner's manual or a tire professional.

Speedometer difference

When the speedometer reads 60 mph on a vehicle built for 245/70R17, the actual speed on 265/60R18 is about 60.0 mph. When it reads 60 mph on a vehicle built for 265/60R18, the actual speed on 245/70R17 is about 60.0 mph. These figures assume the speedometer is accurate on the original size and use nominal dimensions, so treat them as estimates.

Actual speed for a given speedometer reading, 245/70R17 against 265/60R18
Speedometer readsActual on 265/60R18 (built for 245/70R17)Actual on 245/70R17 (built for 265/60R18)
20 mph20.0 mph20.0 mph
30 mph30.0 mph30.0 mph
40 mph40.0 mph40.0 mph
50 mph50.0 mph50.0 mph
60 mph60.0 mph60.0 mph
70 mph70.0 mph70.0 mph
80 mph80.0 mph80.0 mph

A common rule of thumb is to keep a replacement size within about 3% of the original overall diameter. Check the tire placard on the driver's door jamb and your owner's manual for the sizes your vehicle was built for. Confirm any size change with your vehicle's owner's manual or a tire professional.

Which vehicles use each size?

These vehicles list the size among their verified sizes, by trim. Open one to see all of its sizes.

Check it in the calculator

The calculator takes the same two sizes and shows the full comparison, or lets you swap either one for another size.

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Shop for 245/70R17 or 265/60R18 tires

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Other comparisons with 245/70R17

Side-by-side dimensions and speedometer difference for sizes close to 245/70R17 in overall diameter.

Other comparisons with 265/60R18

Side-by-side dimensions and speedometer difference for sizes close to 265/60R18 in overall diameter.

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