Comparison
235/55 R17 vs 255/35 R20
Compared to 235/55 R17, 255/35 R20 is 3.8 mm shorter and changes the speedometer reading by -0.55%.
Current Tire
235/55R17
New Tire
255/35R20
235/55 R17
255/35 R20
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-3.8 mm
-0.55%
Speedometer at 100
99.4 km/h
-0.55% error
Ground clearance
-1.9 mm
ride height delta
Sidewall change
-40.0 mm
revs/km: 463.7
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/compare/235-55-r17-vs-255-35-r20Detailed comparison
| Metric | 235/55 R17 | 255/35 R20 | Difference |
|---|---|---|---|
| Overall diameter | 690.3 mm | 686.5 mm | -3.8 mm (-0.55%) |
| Sidewall height | 129.3 mm | 89.3 mm | -40.0 mm |
| Circumference | 2.169 m | 2.157 m | -11.9 mm |
| Revs / km | 461.1 | 463.7 | +2.6 |
| Ground clearance | reference | -1.9 mm | -1.9 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 99.4 km/h | -0.55 km/h |
Verdict: excellent
Within ±3% — speedometer, ABS and traction control should behave normally.
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235/55 R17
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255/35 R20