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Tire Size Comparison

265/30R19 vs 225/40R19

Switching from 265/30R19 to 225/40R19 changes overall diameter by +3.27% (25.26 in → 26.09 in).

+3.27%Borderline — noticeable speedometer/odometer error

Speedometer error

With a speedometer calibrated to 265/30R19, fitting 225/40R19 makes it read as follows:

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h41.3 km/h25 mph26 mph
60 km/h62.0 km/h37 mph39 mph
80 km/h82.6 km/h50 mph51 mph
100 km/h103.3 km/h62 mph64 mph
120 km/h123.9 km/h75 mph77 mph

Full comparison

265/30R19
Overall diameter641.6 mm · 25.26 in
Section width265 mm · 10.43 in
Sidewall height79.5 mm · 3.13 in
Circumference2015.6 mm · 79.4 in
Revolutions per mile798
Revolutions per km496
225/40R19
Overall diameter662.6 mm · 26.09 in
Section width225 mm · 8.86 in
Sidewall height90.0 mm · 3.54 in
Circumference2081.6 mm · 82.0 in
Revolutions per mile773
Revolutions per km480
Original tire
New tire
+3.27%Borderline — noticeable speedometer/odometer error
25.326.1
Original
Overall diameter641.6 mm · 25.26 in
Sidewall height79.5 mm
Circumference2,015.6 mm
Revolutions / mile798.4
New
Overall diameter662.6 mm · 26.09 in
Sidewall height90 mm
Circumference2,081.6 mm
Revolutions / mile773.1
Speedometer & odometer error

The new tire changes overall diameter by +3.27%. With a speedometer calibrated to the original tire, that same percentage is how far the speedometer and odometer read off — a taller tire means your true speed is higher than indicated and the odometer under-counts distance.

Speedo showsTrue speedSpeedo showsTrue speed
40 km/h41.3 km/h25 mph26 mph
60 km/h62 km/h37 mph39 mph
80 km/h82.6 km/h50 mph51 mph
100 km/h103.3 km/h62 mph64 mph
120 km/h123.9 km/h75 mph77 mph

See individual specs: 265/30R19 · 225/40R19. A change this size can affect ABS/speed calibration — see wheel-speed codes if a light appears.