Comparison
255/35 R21 vs 295/35 R21
Stepping from 255/35 R21 to 295/35 R21 keeps the 21-inch wheel but widens the section by 40 mm. This swap swings rolling diameter far enough to feel on the road. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff.
Indicated speed will drift far enough that recalibration is worth considering. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeUseful when extra dry grip and stance matter more than a small fuel-economy hit.
Quick math: 295/35 R21 is 28.0 mm taller than 255/35 R21, shifting the speedometer by +3.93%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+28.0 mm
3.93%
Speedometer at 100
103.9 km/h
+3.93% error
Ground clearance
+14.0 mm
ride height delta
Sidewall change
+14.0 mm
revs/km: 430.2
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/compare/255-35-r21-vs-295-35-r21Detailed comparison
| Metric | 255/35 R21 | 295/35 R21 | Difference |
|---|---|---|---|
| Overall diameter | 711.9 mm | 739.9 mm | +28.0 mm (+3.93%) |
| Sidewall height | 89.3 mm | 103.3 mm | +14.0 mm |
| Circumference | 2.236 m | 2.324 m | +88.0 mm |
| Revs / km | 447.1 | 430.2 | -16.9 |
| Ground clearance | reference | +14.0 mm | +14.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.9 km/h | +3.93 km/h |
Verdict: warning
Between 3% and 5% — noticeable speedometer drift; recalibration may be advisable.
Speedometer impact
At a true 100 km/h, your dashboard will read 103.9 km/h after switching to 295/35 R21 — a +3.93% 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 +14.0 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.
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255/35 R21
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295/35 R21
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