Question 1

Which tire is taller, 285/45 R22 or 265/60 R18?

Accepted Answer

285/45 R22 is taller by 40.1 mm (4.92%) compared with 265/60 R18.

Question 2

What is the diameter difference between 285/45 R22 and 265/60 R18?

Accepted Answer

285/45 R22 measures 815 mm overall diameter, 265/60 R18 measures 775 mm — a difference of 40.1 mm (4.92%).

Question 3

How much speedometer error does this change create?

Accepted Answer

Switching from 285/45 R22 to 265/60 R18 changes the speedometer reading by -4.92%. At an indicated 100 km/h, your true speed becomes about 95.1 km/h.

Question 4

Is 265/60 R18 a safe replacement for 285/45 R22?

Accepted Answer

Between 3% and 5% diameter difference — speedometer drift is noticeable. Consider recalibration and confirm clearance with your vehicle's manufacturer specification.

Question 5

What else should I check before changing tire size?

Accepted Answer

Beyond diameter and speedometer error, verify wheel offset (ET), rim width, hub bore, load index, brake and suspension clearance, and your vehicle's manufacturer specification. Local regulations may also limit how far you can deviate from OEM.

Metric	285/45 R22	265/60 R18	Difference
Overall diameter	815.3 mm	775.2 mm	-40.1 mm (-4.92%)
Sidewall height	128.3 mm	159.0 mm	+30.8 mm
Circumference	2.561 m	2.435 m	-126.0 mm
Revs / km	390.4	410.6	+20.2
Ground clearance	reference	-20.0 mm	-20.0 mm
Speedometer @ 100 km/h	100.0 km/h	95.1 km/h	-4.92 km/h

285/45 R22 vs 265/60 R18

Detailed comparison

Verdict: warning

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