Question 1

Which tire is taller, 265/50 R20 or 315/30 R22?

Accepted Answer

265/50 R20 is taller by 25.2 mm (3.26%) compared with 315/30 R22.

Question 2

What is the diameter difference between 265/50 R20 and 315/30 R22?

Accepted Answer

265/50 R20 measures 773 mm overall diameter, 315/30 R22 measures 748 mm — a difference of 25.2 mm (3.26%).

Question 3

How much speedometer error does this change create?

Accepted Answer

Switching from 265/50 R20 to 315/30 R22 changes the speedometer reading by -3.26%. At an indicated 100 km/h, your true speed becomes about 96.7 km/h.

Question 4

Is 315/30 R22 a safe replacement for 265/50 R20?

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	265/50 R20	315/30 R22	Difference
Overall diameter	773.0 mm	747.8 mm	-25.2 mm (-3.26%)
Sidewall height	132.5 mm	94.5 mm	-38.0 mm
Circumference	2.428 m	2.349 m	-79.2 mm
Revs / km	411.8	425.7	+13.9
Ground clearance	reference	-12.6 mm	-12.6 mm
Speedometer @ 100 km/h	100.0 km/h	96.7 km/h	-3.26 km/h

265/50 R20 vs 315/30 R22

Detailed comparison

Verdict: warning

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