Comparison
275/35 R22 vs 285/35 R21
Switching from 275/35 R22 to 285/35 R21 steps down to a 21-inch wheel — a familiar move for winter and dedicated all-terrain sets. This swap shifts overall diameter slightly from OEM. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff.
The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakePractical direction for winter wheels, chains, or rougher pavement where cushioning matters.
Quick math: 285/35 R21 is 18.4 mm shorter than 275/35 R22, shifting the speedometer by -2.45%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-18.4 mm
-2.45%
Speedometer at 100
97.6 km/h
-2.45% error
Ground clearance
-9.2 mm
ride height delta
Sidewall change
+3.5 mm
revs/km: 434.3
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/compare/275-35-r22-vs-285-35-r21Detailed comparison
| Metric | 275/35 R22 | 285/35 R21 | Difference |
|---|---|---|---|
| Overall diameter | 751.3 mm | 732.9 mm | -18.4 mm (-2.45%) |
| Sidewall height | 96.3 mm | 99.8 mm | +3.5 mm |
| Circumference | 2.360 m | 2.302 m | -57.8 mm |
| Revs / km | 423.7 | 434.3 | +10.6 |
| Ground clearance | reference | -9.2 mm | -9.2 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 97.6 km/h | -2.45 km/h |
Verdict: excellent
Within ±3% — speedometer, ABS and traction control should behave normally.
Speedometer impact
At a true 100 km/h, your dashboard will read 97.6 km/h after switching to 285/35 R21 — a -2.45% offset. Use the speedometer error calculator to recheck for other indicated speeds, and the speedometer error guide for the full background.
Ground clearance change
The new tire's half-diameter changes ride height by -9.2 mm. Small differences are absorbed by suspension travel, but anything beyond ±10 mm can affect headlight aim, fender clearance and bump-stop margin. See the plus-sizing guide before committing.
Back to
275/35 R22
Back to
285/35 R21
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