Comparison
275/35 R21 vs 225/45 R17
Compared to 275/35 R21, 225/45 R17 is 91.6 mm shorter and changes the speedometer reading by -12.62%.
Current Tire
275/35R21
New Tire
225/45R17
275/35 R21
225/45 R17
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
-91.6 mm
-12.62%
Speedometer at 100
87.4 km/h
-12.62% error
Ground clearance
-45.8 mm
ride height delta
Sidewall change
+5.0 mm
revs/km: 501.8
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/compare/275-35-r21-vs-225-45-r17Detailed comparison
| Metric | 275/35 R21 | 225/45 R17 | Difference |
|---|---|---|---|
| Overall diameter | 725.9 mm | 634.3 mm | -91.6 mm (-12.62%) |
| Sidewall height | 96.3 mm | 101.3 mm | +5.0 mm |
| Circumference | 2.280 m | 1.993 m | -287.8 mm |
| Revs / km | 438.5 | 501.8 | +63.3 |
| Ground clearance | reference | -45.8 mm | -45.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 87.4 km/h | -12.62 km/h |
Verdict: danger
Over 5% diameter difference — likely to affect speedometer accuracy, ABS calibration and gearing. Not recommended without professional review.
Back to
275/35 R21
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225/45 R17