Comparison
245/35 R20 vs 255/35 R20
Stepping from 245/35 R20 to 255/35 R20 keeps the 20-inch wheel but widens the section by 10 mm. This swap barely shifts the rolling circumference.
Dashboard speed shifts only marginally — within the noise of normal OEM tolerance. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeReasonable performance-leaning swap as long as fender and suspension clearance check out.
Quick math: 255/35 R20 is 7.0 mm taller than 245/35 R20, shifting the speedometer by +1.03%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+7.0 mm
1.03%
Speedometer at 100
101.0 km/h
+1.03% error
Ground clearance
+3.5 mm
ride height delta
Sidewall change
+3.5 mm
revs/km: 463.7
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/compare/245-35-r20-vs-255-35-r20Detailed comparison
| Metric | 245/35 R20 | 255/35 R20 | Difference |
|---|---|---|---|
| Overall diameter | 679.5 mm | 686.5 mm | +7.0 mm (+1.03%) |
| Sidewall height | 85.8 mm | 89.3 mm | +3.5 mm |
| Circumference | 2.135 m | 2.157 m | +22.0 mm |
| Revs / km | 468.4 | 463.7 | -4.8 |
| Ground clearance | reference | +3.5 mm | +3.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 101.0 km/h | +1.03 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 101.0 km/h after switching to 255/35 R20 — a +1.03% 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 +3.5 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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245/35 R20
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255/35 R20
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