Comparison
255/45 R20 vs 255/35 R21
Compared to 255/45 R20, 255/35 R21 is 25.6 mm shorter and changes the speedometer reading by -3.47%.
Current Tire
255/45R20
New Tire
255/35R21
255/45 R20
255/35 R21
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-25.6 mm
-3.47%
Speedometer at 100
96.5 km/h
-3.47% error
Ground clearance
-12.8 mm
ride height delta
Sidewall change
-25.5 mm
revs/km: 447.1
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/compare/255-45-r20-vs-255-35-r21Detailed comparison
| Metric | 255/45 R20 | 255/35 R21 | Difference |
|---|---|---|---|
| Overall diameter | 737.5 mm | 711.9 mm | -25.6 mm (-3.47%) |
| Sidewall height | 114.8 mm | 89.3 mm | -25.5 mm |
| Circumference | 2.317 m | 2.236 m | -80.4 mm |
| Revs / km | 431.6 | 447.1 | +15.5 |
| Ground clearance | reference | -12.8 mm | -12.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.5 km/h | -3.47 km/h |
Verdict: warning
Between 3% and 5% — noticeable speedometer drift; recalibration may be advisable.
Back to
255/45 R20
Back to
255/35 R21