Comparison
245/40 R20 vs 265/35 R20
On the same 20-inch wheel, 265/35 R20 grows the section width by 20 mm versus 245/40 R20. This tire combination lands within OEM rolling-diameter tolerance. Speedometer drift stays small enough that most drivers won't notice it day to day. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeUseful when extra dry grip and stance matter more than a small fuel-economy hit.
Quick math: 265/35 R20 is 10.5 mm shorter than 245/40 R20, shifting the speedometer by -1.49%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-10.5 mm
-1.49%
Speedometer at 100
98.5 km/h
-1.49% error
Ground clearance
-5.3 mm
ride height delta
Sidewall change
-5.3 mm
revs/km: 459.0
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/compare/245-40-r20-vs-265-35-r20Detailed comparison
| Metric | 245/40 R20 | 265/35 R20 | Difference |
|---|---|---|---|
| Overall diameter | 704.0 mm | 693.5 mm | -10.5 mm (-1.49%) |
| Sidewall height | 98.0 mm | 92.8 mm | -5.3 mm |
| Circumference | 2.212 m | 2.179 m | -33.0 mm |
| Revs / km | 452.1 | 459.0 | +6.8 |
| Ground clearance | reference | -5.3 mm | -5.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.5 km/h | -1.49 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 98.5 km/h after switching to 265/35 R20 — a -1.49% 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 -5.3 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
245/40 R20
Back to
265/35 R20
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