Comparison
285/30 R20 vs 295/35 R20
295/35 R20 is a wider variation of 285/30 R20 on the same 20-inch rim, adding 10 mm of tread footprint. This setup moves rolling diameter well outside the usual OEM tolerance. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement.
Speedometer error is large enough that recalibration is effectively required for accurate readings. The diameter gap exceeds 5%, which can affect speedometer accuracy, ABS calibration and final gearing — review with a professional first.
TakeRecommended only after a professional fitment check and speedometer recalibration.
Quick math: 295/35 R20 is 35.5 mm taller than 285/30 R20, shifting the speedometer by +5.23%.
Current Tire
New Tire
Ground line · scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
+35.5 mm
5.23%
Speedometer at 100
105.2 km/h
+5.23% error
Ground clearance
+17.8 mm
ride height delta
Sidewall change
+17.8 mm
revs/km: 445.5
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/compare/285-30-r20-vs-295-35-r20Detailed comparison
| Metric | 285/30 R20 | 295/35 R20 | Difference |
|---|---|---|---|
| Overall diameter | 679.0 mm | 714.5 mm | +35.5 mm (+5.23%) |
| Sidewall height | 85.5 mm | 103.3 mm | +17.8 mm |
| Circumference | 2.133 m | 2.245 m | +111.5 mm |
| Revs / km | 468.8 | 445.5 | -23.3 |
| Ground clearance | reference | +17.8 mm | +17.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 105.2 km/h | +5.23 km/h |
Verdict: danger
Over 5% diameter difference — likely to affect speedometer accuracy, ABS calibration and gearing. Not recommended without professional review.
Speedometer impact
At a true 100 km/h, your dashboard will read 105.2 km/h after switching to 295/35 R20 — a +5.23% 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 +17.8 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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285/30 R20
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295/35 R20
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