275/45R19 vs 265/50R19

Q: Can I replace 275/45R19 with 265/50R19?

265/50R19 is a safe swap for 275/45R19 by the usual ±3% rule: the diameter differs by +2.40%.

265/50R19 is a safe swap for 275/45R19 by the usual ±3% rule: the diameter differs by +2.40%.

275/45R19 28.74" · 265/50R19 29.43" · drawn to scale

Side by side

	275/45R19	265/50R19	Difference
Overall diameter	28.74"	29.43"	+0.69" (+2.40%)
Section width	275 mm	265 mm	-10 mm
Sidewall	4.87"	5.22"	+0.34"
Rim	19"	19"	same
Circumference	90.3"	92.5"	+2.2"
Revs per mile	702	685	-16
Ride height	—	—	+0.34"
Speedometer reads 60 mph	60.0	61.4	+1.4 mph

Speedometer and odometer

With 265/50R19 on a car calibrated for 275/45R19, the speedometer reads 58.6 mph when you're really doing 60, and the odometer under-counts by 2.4%.

Speedo shows	Actual speed
30 mph	30.7 mph
45 mph	46.1 mph
60 mph	61.4 mph
70 mph	71.7 mph
80 mph	81.9 mph

Other sizes close to 275/45R19

Questions

Can I replace 275/45R19 with 265/50R19?

265/50R19 is a safe swap for 275/45R19 by the usual ±3% rule: the diameter differs by +2.40%.

What's the difference between 275/45R19 and 265/50R19?

265/50R19 is 0.69" taller and 10 mm narrower; the sidewall is +0.34". At an indicated 60 mph you'd actually be doing 61.4 mph.

Will 265/50R19 fit on 275/45R19 wheels?

Both use a 19" rim, so the wheel diameter matches; check the wheel's width range for a 265 mm tire and the fender clearance.