Question 1

Which tire is taller, 195/50 R15 or 195/55 R16?

Accepted Answer

195/55 R16 is taller by 44.9 mm (7.80%) compared with 195/50 R15.

Question 2

What is the diameter difference between 195/50 R15 and 195/55 R16?

Accepted Answer

195/50 R15 measures 576 mm overall diameter, 195/55 R16 measures 621 mm — a difference of 44.9 mm (7.80%).

Question 3

How much speedometer error does this change create?

Accepted Answer

Switching from 195/50 R15 to 195/55 R16 changes the speedometer reading by +7.80%. At an indicated 100 km/h, your true speed becomes about 107.8 km/h.

Question 4

Is 195/55 R16 a safe replacement for 195/50 R15?

Accepted Answer

Over 5% diameter difference. This is outside the common safe range and can affect speedometer accuracy, ABS calibration and gearing. Not recommended without professional review.

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	195/50 R15	195/55 R16	Difference
Overall diameter	576.0 mm	620.9 mm	+44.9 mm (+7.80%)
Sidewall height	97.5 mm	107.3 mm	+9.8 mm
Circumference	1.810 m	1.951 m	+141.1 mm
Revs / km	552.6	512.7	-40.0
Ground clearance	reference	+22.4 mm	+22.4 mm
Speedometer @ 100 km/h	100.0 km/h	107.8 km/h	+7.80 km/h

195/50 R15 vs 195/55 R16

Detailed comparison

Verdict: danger

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