245/70R16 vs 245/65R17

Q: Can I replace 245/70R16 with 245/65R17?

245/65R17 is a safe swap for 245/70R16 by the usual ±3% rule: the diameter differs by +0.12%.

245/65R17 is a safe swap for 245/70R16 by the usual ±3% rule: the diameter differs by +0.12%.

245/70R16 29.50" · 245/65R17 29.54" · drawn to scale

Side by side

	245/70R16	245/65R17	Difference
Overall diameter	29.50"	29.54"	+0.04" (+0.12%)
Section width	245 mm	245 mm	0 mm
Sidewall	6.75"	6.27"	-0.48"
Rim	16"	17"	+1"
Circumference	92.7"	92.8"	+0.1"
Revs per mile	684	683	-1
Ride height	—	—	+0.02"
Speedometer reads 60 mph	60.0	60.1	+0.1 mph

Speedometer and odometer

With 245/65R17 on a car calibrated for 245/70R16, the speedometer reads 59.9 mph when you're really doing 60, and the odometer under-counts by 0.1%.

Speedo shows	Actual speed
30 mph	30.0 mph
45 mph	45.1 mph
60 mph	60.1 mph
70 mph	70.1 mph
80 mph	80.1 mph

Other sizes close to 245/70R16

Questions

Can I replace 245/70R16 with 245/65R17?

245/65R17 is a safe swap for 245/70R16 by the usual ±3% rule: the diameter differs by +0.12%.

What's the difference between 245/70R16 and 245/65R17?

245/65R17 is 0.04" taller and 0 mm wider; the sidewall is -0.48". At an indicated 60 mph you'd actually be doing 60.1 mph.

Will 245/65R17 fit on 245/70R16 wheels?

No — 245/70R16 needs a 16" wheel and 245/65R17 a 17" wheel. This is a plus/minus-size swap that changes wheels too.