Comparison
255/35 R21 vs 225/55 R18
Compared to 255/35 R21, 225/55 R18 is 7.2 mm shorter and changes the speedometer reading by -1.01%.
Current Tire
255/35R21
New Tire
225/55R18
255/35 R21
225/55 R18
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-7.2 mm
-1.01%
Speedometer at 100
99.0 km/h
-1.01% error
Ground clearance
-3.6 mm
ride height delta
Sidewall change
+34.5 mm
revs/km: 451.7
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/compare/255-35-r21-vs-225-55-r18Detailed comparison
| Metric | 255/35 R21 | 225/55 R18 | Difference |
|---|---|---|---|
| Overall diameter | 711.9 mm | 704.7 mm | -7.2 mm (-1.01%) |
| Sidewall height | 89.3 mm | 123.8 mm | +34.5 mm |
| Circumference | 2.236 m | 2.214 m | -22.6 mm |
| Revs / km | 447.1 | 451.7 | +4.6 |
| Ground clearance | reference | -3.6 mm | -3.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 99.0 km/h | -1.01 km/h |
Verdict: excellent
Within ±3% — speedometer, ABS and traction control should behave normally.
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255/35 R21
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225/55 R18