What is the diameter difference between 275/30R19 and 275/35R19?

275/30R19 has an overall diameter of 25.5 inches (648 mm). 275/35R19 is 26.58 inches (675 mm). That's a 1.08 inch (28 mm) difference — 275/35R19 is taller.

Will 275/35R19 cause speedometer error on a car fitted with 275/30R19?

Swapping 275/30R19 for 275/35R19 produces a speedometer error of about 4.2%. 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?

275/30R19 turns 791 revs per mile. 275/35R19 turns 759 revs per mile. Taller tyres turn fewer times per mile, which lowers effective final-drive ratio.

What's the sidewall height difference?

275/30R19 has a sidewall of 83 mm (3.25 in). 275/35R19 sidewall is 96 mm (3.79 in). Lower-profile sidewalls give sharper steering response but less bump compliance.

Is 275/35R19 a safe plus-size upgrade from 275/30R19?

A plus-size upgrade is considered safe when overall diameter stays within ±3% — here the difference is 4.2%. This swap is outside the typical ±3% safe range and may require speedometer recalibration or affect ABS / traction control behaviour.

Tire size comparison

275/30R19 vs 275/35R19

Overall diameter, sidewall, revs per mile, and speedometer error — 275/35R19 is the taller tire, with a 4.2% speedo delta when swapping.

275/30R19

25.5in

648 mm overall diameter

275/35R19

26.58in

675 mm overall diameter

Diameter Δ

1.08 in

Speedo error

4.2%

275/30R19 revs/mi

791

275/35R19 revs/mi

759

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	275/30R19	275/35R19
Section width	275 mm	275 mm
Aspect ratio	30	35
Wheel diameter	19″	19″
Sidewall height	83 mm	96 mm
Overall diameter	25.5 in (648 mm)	26.58 in (675 mm)
Circumference	80.1 in	83.5 in
Revolutions / mile	791	759

Other comparisons for these sizes

265/35R18 vs 275/30R19 275/35R18 vs 275/30R19 275/40R18 vs 275/35R19 255/35R19 vs 275/35R19 265/30R19 vs 275/30R19 265/35R19 vs 275/35R19 265/35R19 vs 275/30R19 275/30R19 vs 285/30R19 275/35R19 vs 285/30R20 275/35R19 vs 275/30R20

FAQ

Frequently asked

What is the diameter difference between 275/30R19 and 275/35R19?: 275/30R19 has an overall diameter of 25.5 inches (648 mm). 275/35R19 is 26.58 inches (675 mm). That's a 1.08 inch (28 mm) difference — 275/35R19 is taller.
Will 275/35R19 cause speedometer error on a car fitted with 275/30R19?: Swapping 275/30R19 for 275/35R19 produces a speedometer error of about 4.2%. 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?: 275/30R19 turns 791 revs per mile. 275/35R19 turns 759 revs per mile. Taller tyres turn fewer times per mile, which lowers effective final-drive ratio.
What's the sidewall height difference?: 275/30R19 has a sidewall of 83 mm (3.25 in). 275/35R19 sidewall is 96 mm (3.79 in). Lower-profile sidewalls give sharper steering response but less bump compliance.
Is 275/35R19 a safe plus-size upgrade from 275/30R19?: A plus-size upgrade is considered safe when overall diameter stays within ±3% — here the difference is 4.2%. This swap is outside the typical ±3% safe range and may require speedometer recalibration or affect ABS / traction control behaviour.