245/75R16 vs 265/65R17

Q: Can I replace 245/75R16 with 265/65R17?

265/65R17 is a safe swap for 245/75R16 by the usual ±3% rule: the diameter differs by +0.31%.

265/65R17 is a safe swap for 245/75R16 by the usual ±3% rule: the diameter differs by +0.31%.

245/75R16 30.47" · 265/65R17 30.56" · drawn to scale

Side by side

	245/75R16	265/65R17	Difference
Overall diameter	30.47"	30.56"	+0.09" (+0.31%)
Section width	245 mm	265 mm	+20 mm
Sidewall	7.23"	6.78"	-0.45"
Rim	16"	17"	+1"
Circumference	95.7"	96.0"	+0.3"
Revs per mile	662	660	-2
Ride height	—	—	+0.05"
Speedometer reads 60 mph	60.0	60.2	+0.2 mph

Speedometer and odometer

With 265/65R17 on a car calibrated for 245/75R16, the speedometer reads 59.8 mph when you're really doing 60, and the odometer under-counts by 0.3%.

Speedo shows	Actual speed
30 mph	30.1 mph
45 mph	45.1 mph
60 mph	60.2 mph
70 mph	70.2 mph
80 mph	80.2 mph

Other sizes close to 245/75R16

Questions

Can I replace 245/75R16 with 265/65R17?

265/65R17 is a safe swap for 245/75R16 by the usual ±3% rule: the diameter differs by +0.31%.

What's the difference between 245/75R16 and 265/65R17?

265/65R17 is 0.09" taller and 20 mm wider; the sidewall is -0.45". At an indicated 60 mph you'd actually be doing 60.2 mph.

Will 265/65R17 fit on 245/75R16 wheels?

No — 245/75R16 needs a 16" wheel and 265/65R17 a 17" wheel. This is a plus/minus-size swap that changes wheels too.