Question 1

Which tire is taller, 205/45 R16 or 205/50 R16?

Accepted Answer

205/50 R16 is taller by 20.5 mm (3.47%) compared with 205/45 R16.

Question 2

What is the diameter difference between 205/45 R16 and 205/50 R16?

Accepted Answer

205/45 R16 measures 591 mm overall diameter, 205/50 R16 measures 611 mm — a difference of 20.5 mm (3.47%).

Question 3

How much speedometer error does this change create?

Accepted Answer

Switching from 205/45 R16 to 205/50 R16 changes the speedometer reading by +3.47%. At an indicated 100 km/h, your true speed becomes about 103.5 km/h.

Question 4

Is 205/50 R16 a safe replacement for 205/45 R16?

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	205/45 R16	205/50 R16	Difference
Overall diameter	590.9 mm	611.4 mm	+20.5 mm (+3.47%)
Sidewall height	92.3 mm	102.5 mm	+10.3 mm
Circumference	1.856 m	1.921 m	+64.4 mm
Revs / km	538.7	520.6	-18.1
Ground clearance	reference	+10.3 mm	+10.3 mm
Speedometer @ 100 km/h	100.0 km/h	103.5 km/h	+3.47 km/h

205/45 R16 vs 205/50 R16

Detailed comparison

Verdict: warning

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