245/75R17 vs 265/70R17

Q: Can I replace 245/75R17 with 265/70R17?

265/70R17 is a safe swap for 245/75R17 by the usual ±3% rule: the diameter differs by +0.44%.

265/70R17 is a safe swap for 245/75R17 by the usual ±3% rule: the diameter differs by +0.44%.

245/75R17 31.47" · 265/70R17 31.61" · drawn to scale

Side by side

	245/75R17	265/70R17	Difference
Overall diameter	31.47"	31.61"	+0.14" (+0.44%)
Section width	245 mm	265 mm	+20 mm
Sidewall	7.23"	7.30"	+0.07"
Rim	17"	17"	same
Circumference	98.9"	99.3"	+0.4"
Revs per mile	641	638	-3
Ride height	—	—	+0.07"
Speedometer reads 60 mph	60.0	60.3	+0.3 mph

Speedometer and odometer

With 265/70R17 on a car calibrated for 245/75R17, the speedometer reads 59.7 mph when you're really doing 60, and the odometer under-counts by 0.4%.

Speedo shows	Actual speed
30 mph	30.1 mph
45 mph	45.2 mph
60 mph	60.3 mph
70 mph	70.3 mph
80 mph	80.4 mph

Other sizes close to 245/75R17

Questions

Can I replace 245/75R17 with 265/70R17?

265/70R17 is a safe swap for 245/75R17 by the usual ±3% rule: the diameter differs by +0.44%.

What's the difference between 245/75R17 and 265/70R17?

265/70R17 is 0.14" taller and 20 mm wider; the sidewall is +0.07". At an indicated 60 mph you'd actually be doing 60.3 mph.

Will 265/70R17 fit on 245/75R17 wheels?

Both use a 17" rim, so the wheel diameter matches; check the wheel's width range for a 265 mm tire and the fender clearance.