What is the diameter difference between 285/35R22 and 295/30R22?

285/35R22 has an overall diameter of 29.85 inches (758 mm). 295/30R22 is 28.97 inches (736 mm). That's a 0.89 inch (23 mm) difference — 295/30R22 is shorter.

Will 295/30R22 cause speedometer error on a car fitted with 285/35R22?

Swapping 285/35R22 for 295/30R22 produces a speedometer error of about 3%. Your speedometer will read higher than your actual speed — a 60 mph indicated reading is really 58.2 mph. Anything under 3% is usually acceptable without recalibration.

How many revolutions per mile does each size do?

285/35R22 turns 676 revs per mile. 295/30R22 turns 696 revs per mile. Taller tyres turn fewer times per mile, which lowers effective final-drive ratio.

What's the sidewall height difference?

285/35R22 has a sidewall of 100 mm (3.93 in). 295/30R22 sidewall is 89 mm (3.48 in). Lower-profile sidewalls give sharper steering response but less bump compliance.

Is 295/30R22 a safe plus-size upgrade from 285/35R22?

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

Tire size comparison

285/35R22 vs 295/30R22

Overall diameter, sidewall, revs per mile, and speedometer error — 285/35R22 is the taller tire, with a 3% speedo delta when swapping.

285/35R22

29.85in

758 mm overall diameter

295/30R22

28.97in

736 mm overall diameter

Diameter Δ

0.89 in

Speedo error

285/35R22 revs/mi

676

295/30R22 revs/mi

696

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	285/35R22	295/30R22
Section width	285 mm	295 mm
Aspect ratio	35	30
Wheel diameter	22″	22″
Sidewall height	100 mm	89 mm
Overall diameter	29.85 in (758 mm)	28.97 in (736 mm)
Circumference	93.79 in	91.01 in
Revolutions / mile	676	696

Other comparisons for these sizes

295/35R21 vs 295/30R22 285/30R22 vs 295/30R22 285/30R22 vs 285/35R22 285/35R22 vs 295/35R22 295/30R22 vs 305/30R22 295/30R22 vs 315/30R22 295/30R22 vs 295/35R22

FAQ

Frequently asked

What is the diameter difference between 285/35R22 and 295/30R22?: 285/35R22 has an overall diameter of 29.85 inches (758 mm). 295/30R22 is 28.97 inches (736 mm). That's a 0.89 inch (23 mm) difference — 295/30R22 is shorter.
Will 295/30R22 cause speedometer error on a car fitted with 285/35R22?: Swapping 285/35R22 for 295/30R22 produces a speedometer error of about 3%. Your speedometer will read higher than your actual speed — a 60 mph indicated reading is really 58.2 mph. Anything under 3% is usually acceptable without recalibration.
How many revolutions per mile does each size do?: 285/35R22 turns 676 revs per mile. 295/30R22 turns 696 revs per mile. Taller tyres turn fewer times per mile, which lowers effective final-drive ratio.
What's the sidewall height difference?: 285/35R22 has a sidewall of 100 mm (3.93 in). 295/30R22 sidewall is 89 mm (3.48 in). Lower-profile sidewalls give sharper steering response but less bump compliance.
Is 295/30R22 a safe plus-size upgrade from 285/35R22?: A plus-size upgrade is considered safe when overall diameter stays within ±3% — here the difference is 3%. This swap is within the typical safe range; speedometer and ABS calibration should remain close to factory.