Comparison
245/45 R20 vs 265/35 R20
Going from 245/45 R20 to 265/35 R20 keeps the rim but tightens the sidewall for a sportier look. This setup noticeably changes overall diameter compared to OEM. Indicated speed will drift far enough that recalibration is worth considering. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.
TakeSuits drivers who value sharper steering and appearance over outright ride softness.
Quick math: 265/35 R20 is 35.0 mm shorter than 245/45 R20, shifting the speedometer by -4.80%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-35.0 mm
-4.80%
Speedometer at 100
95.2 km/h
-4.80% error
Ground clearance
-17.5 mm
ride height delta
Sidewall change
-17.5 mm
revs/km: 459.0
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/compare/245-45-r20-vs-265-35-r20Detailed comparison
| Metric | 245/45 R20 | 265/35 R20 | Difference |
|---|---|---|---|
| Overall diameter | 728.5 mm | 693.5 mm | -35.0 mm (-4.80%) |
| Sidewall height | 110.3 mm | 92.8 mm | -17.5 mm |
| Circumference | 2.289 m | 2.179 m | -110.0 mm |
| Revs / km | 436.9 | 459.0 | +22.1 |
| Ground clearance | reference | -17.5 mm | -17.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 95.2 km/h | -4.80 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 95.2 km/h after switching to 265/35 R20 — a -4.80% 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 -17.5 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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245/45 R20
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265/35 R20
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