What is the diameter difference between 265/30R19 and 265/35R19?

265/30R19 has an overall diameter of 25.26 inches (642 mm). 265/35R19 is 26.3 inches (668 mm). That's a 1.04 inch (27 mm) difference — 265/35R19 is taller.

Will 265/35R19 cause speedometer error on a car fitted with 265/30R19?

Swapping 265/30R19 for 265/35R19 produces a speedometer error of about 4.1%. Your speedometer will read lower than your actual speed — a 60 mph indicated reading is really 62.5 mph. Anything under 3% is usually acceptable without recalibration.

How many revolutions per mile does each size do?

265/30R19 turns 798 revs per mile. 265/35R19 turns 767 revs per mile. Taller tyres turn fewer times per mile, which lowers effective final-drive ratio.

What's the sidewall height difference?

265/30R19 has a sidewall of 80 mm (3.13 in). 265/35R19 sidewall is 93 mm (3.65 in). Lower-profile sidewalls give sharper steering response but less bump compliance.

Is 265/35R19 a safe plus-size upgrade from 265/30R19?

A plus-size upgrade is considered safe when overall diameter stays within ±3% — here the difference is 4.1%. This swap is outside the typical ±3% safe range and may require speedometer recalibration or affect ABS / traction control behaviour.

Tire size comparison

265/30R19 vs 265/35R19

Overall diameter, sidewall, revs per mile, and speedometer error — 265/35R19 is the taller tire, with a 4.1% speedo delta when swapping.

265/30R19

25.26in

642 mm overall diameter

265/35R19

26.3in

668 mm overall diameter

Diameter Δ

1.04 in

Speedo error

4.1%

265/30R19 revs/mi

798

265/35R19 revs/mi

767

Outside the typical ±3% safe plus-size band — you may want speedometer recalibration, and this change can affect ABS or traction control behaviour.

Full spec

Side by side

Metric	265/30R19	265/35R19
Section width	265 mm	265 mm
Aspect ratio	30	35
Wheel diameter	19″	19″
Sidewall height	80 mm	93 mm
Overall diameter	25.26 in (642 mm)	26.3 in (668 mm)
Circumference	79.36 in	82.63 in
Revolutions / mile	798	767

Other comparisons for these sizes

245/45R17 vs 265/35R19 255/35R18 vs 265/30R19 255/40R18 vs 265/35R19 265/35R18 vs 265/30R19 245/35R19 vs 265/35R19 255/35R19 vs 265/35R19 255/35R19 vs 265/30R19 255/40R19 vs 265/35R19 265/30R19 vs 275/30R19 265/30R19 vs 285/30R19

FAQ

Frequently asked

What is the diameter difference between 265/30R19 and 265/35R19?: 265/30R19 has an overall diameter of 25.26 inches (642 mm). 265/35R19 is 26.3 inches (668 mm). That's a 1.04 inch (27 mm) difference — 265/35R19 is taller.
Will 265/35R19 cause speedometer error on a car fitted with 265/30R19?: Swapping 265/30R19 for 265/35R19 produces a speedometer error of about 4.1%. Your speedometer will read lower than your actual speed — a 60 mph indicated reading is really 62.5 mph. Anything under 3% is usually acceptable without recalibration.
How many revolutions per mile does each size do?: 265/30R19 turns 798 revs per mile. 265/35R19 turns 767 revs per mile. Taller tyres turn fewer times per mile, which lowers effective final-drive ratio.
What's the sidewall height difference?: 265/30R19 has a sidewall of 80 mm (3.13 in). 265/35R19 sidewall is 93 mm (3.65 in). Lower-profile sidewalls give sharper steering response but less bump compliance.
Is 265/35R19 a safe plus-size upgrade from 265/30R19?: A plus-size upgrade is considered safe when overall diameter stays within ±3% — here the difference is 4.1%. This swap is outside the typical ±3% safe range and may require speedometer recalibration or affect ABS / traction control behaviour.