295/40R20 vs 265/50R19

Q: Can I replace 295/40R20 with 265/50R19?

265/50R19 is a safe swap for 295/40R20 by the usual ±3% rule: the diameter differs by +0.48%.

265/50R19 is a safe swap for 295/40R20 by the usual ±3% rule: the diameter differs by +0.48%.

295/40R20 29.29" · 265/50R19 29.43" · drawn to scale

Side by side

	295/40R20	265/50R19	Difference
Overall diameter	29.29"	29.43"	+0.14" (+0.48%)
Section width	295 mm	265 mm	-30 mm
Sidewall	4.65"	5.22"	+0.57"
Rim	20"	19"	-1"
Circumference	92.0"	92.5"	+0.4"
Revs per mile	689	685	-3
Ride height	—	—	+0.07"
Speedometer reads 60 mph	60.0	60.3	+0.3 mph

Speedometer and odometer

With 265/50R19 on a car calibrated for 295/40R20, the speedometer reads 59.7 mph when you're really doing 60, and the odometer under-counts by 0.5%.

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 295/40R20

Questions

Can I replace 295/40R20 with 265/50R19?

265/50R19 is a safe swap for 295/40R20 by the usual ±3% rule: the diameter differs by +0.48%.

What's the difference between 295/40R20 and 265/50R19?

265/50R19 is 0.14" taller and 30 mm narrower; the sidewall is +0.57". At an indicated 60 mph you'd actually be doing 60.3 mph.

Will 265/50R19 fit on 295/40R20 wheels?

No — 295/40R20 needs a 20" wheel and 265/50R19 a 19" wheel. This is a plus/minus-size swap that changes wheels too.