What is the diameter difference between 225/35R19 and 245/35R19?

225/35R19 has an overall diameter of 25.2 inches (640 mm). 245/35R19 is 25.75 inches (654 mm). That's a 0.55 inch (14 mm) difference — 245/35R19 is taller.

Will 245/35R19 cause speedometer error on a car fitted with 225/35R19?

Swapping 225/35R19 for 245/35R19 produces a speedometer error of about 2.2%. Your speedometer will read lower than your actual speed — a 60 mph indicated reading is really 61.3 mph. Anything under 3% is usually acceptable without recalibration.

How many revolutions per mile does each size do?

225/35R19 turns 800 revs per mile. 245/35R19 turns 783 revs per mile. Taller tyres turn fewer times per mile, which lowers effective final-drive ratio.

What's the sidewall height difference?

225/35R19 has a sidewall of 79 mm (3.1 in). 245/35R19 sidewall is 86 mm (3.38 in). Lower-profile sidewalls give sharper steering response but less bump compliance.

Is 245/35R19 a safe plus-size upgrade from 225/35R19?

A plus-size upgrade is considered safe when overall diameter stays within ±3% — here the difference is 2.2%. This swap is within the typical safe range; speedometer and ABS calibration should remain close to factory.

Tire size comparison

225/35R19 vs 245/35R19

Overall diameter, sidewall, revs per mile, and speedometer error — 245/35R19 is the taller tire, with a 2.2% speedo delta when swapping.

225/35R19

25.2in

640 mm overall diameter

245/35R19

25.75in

654 mm overall diameter

Diameter Δ

0.55 in

Speedo error

2.2%

225/35R19 revs/mi

800

245/35R19 revs/mi

783

Within the ±3% overall-diameter band usually considered safe for plus-sizing — speedometer and ABS calibration should stay close to factory.

Full spec

Side by side

Metric	225/35R19	245/35R19
Section width	225 mm	245 mm
Aspect ratio	35	35
Wheel diameter	19″	19″
Sidewall height	79 mm	86 mm
Overall diameter	25.2 in (640 mm)	25.75 in (654 mm)
Circumference	79.17 in	80.9 in
Revolutions / mile	800	783

Other comparisons for these sizes

225/45R17 vs 245/35R19 215/40R18 vs 225/35R19 225/40R18 vs 225/35R19 235/40R18 vs 245/35R19 245/40R18 vs 245/35R19 225/35R19 vs 235/35R19 225/35R19 vs 225/40R19 235/35R19 vs 245/35R19 245/35R19 vs 255/30R20 245/35R19 vs 255/35R19

FAQ

Frequently asked

What is the diameter difference between 225/35R19 and 245/35R19?: 225/35R19 has an overall diameter of 25.2 inches (640 mm). 245/35R19 is 25.75 inches (654 mm). That's a 0.55 inch (14 mm) difference — 245/35R19 is taller.
Will 245/35R19 cause speedometer error on a car fitted with 225/35R19?: Swapping 225/35R19 for 245/35R19 produces a speedometer error of about 2.2%. Your speedometer will read lower than your actual speed — a 60 mph indicated reading is really 61.3 mph. Anything under 3% is usually acceptable without recalibration.
How many revolutions per mile does each size do?: 225/35R19 turns 800 revs per mile. 245/35R19 turns 783 revs per mile. Taller tyres turn fewer times per mile, which lowers effective final-drive ratio.
What's the sidewall height difference?: 225/35R19 has a sidewall of 79 mm (3.1 in). 245/35R19 sidewall is 86 mm (3.38 in). Lower-profile sidewalls give sharper steering response but less bump compliance.
Is 245/35R19 a safe plus-size upgrade from 225/35R19?: A plus-size upgrade is considered safe when overall diameter stays within ±3% — here the difference is 2.2%. This swap is within the typical safe range; speedometer and ABS calibration should remain close to factory.