Comparison
265/40 R20 vs 315/30 R22
Switching from 265/40 R20 to 315/30 R22 is a plus-2 upgrade that wraps a shorter sidewall around a larger 22-inch wheel. This alternative fitment swings rolling diameter far enough to feel on the road. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement.
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.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 315/30 R22 is 27.8 mm taller than 265/40 R20, shifting the speedometer by +3.86%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
+27.8 mm
3.86%
Speedometer at 100
103.9 km/h
+3.86% error
Ground clearance
+13.9 mm
ride height delta
Sidewall change
-11.5 mm
revs/km: 425.7
Permalink for this comparison:
/compare/265-40-r20-vs-315-30-r22Detailed comparison
| Metric | 265/40 R20 | 315/30 R22 | Difference |
|---|---|---|---|
| Overall diameter | 720.0 mm | 747.8 mm | +27.8 mm (+3.86%) |
| Sidewall height | 106.0 mm | 94.5 mm | -11.5 mm |
| Circumference | 2.262 m | 2.349 m | +87.3 mm |
| Revs / km | 442.1 | 425.7 | -16.4 |
| Ground clearance | reference | +13.9 mm | +13.9 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 103.9 km/h | +3.86 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 315/30 R22 — a +3.86% 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 +13.9 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
265/40 R20
Back to
315/30 R22
Drivers also compare
Closely-related fitments and plus-size swaps for 265/40 R20 and 315/30 R22.
275/35 R22 vs 315/30 R22
Wider variation on the same rim — more grip, less clearance.
Δ 0.47%
265/35 R22 vs 315/30 R22
Wider variation on the same rim — more grip, less clearance.
Δ 0.47%
265/40 R20 vs 295/35 R20
Wider variation on the same rim — more grip, less clearance.
Δ 0.76%
265/40 R20 vs 275/40 R20
Wider variation on the same rim — more grip, less clearance.
Δ 1.11%
245/45 R20 vs 265/40 R20
Wider variation on the same rim — more grip, less clearance.
Δ 1.17%
285/35 R22 vs 315/30 R22
Wider variation on the same rim — more grip, less clearance.
Δ 1.38%
295/30 R22 vs 315/30 R22
Wider variation on the same rim — more grip, less clearance.
Δ 1.63%
265/40 R20 vs 285/35 R20
Wider variation on the same rim — more grip, less clearance.
Δ 1.74%
Related topics