Comparison
275/40 R20 vs 315/30 R22
Plus-sizing from 275/40 R20 to 315/30 R22 keeps overall diameter close to factory while opening room for a larger 22-inch wheel. This alternative fitment trims or stretches rolling diameter by a small margin. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement.
The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeCommon upgrade for sportier handling and a tighter wheel-gap look on the same vehicle.
Quick math: 315/30 R22 is 19.8 mm taller than 275/40 R20, shifting the speedometer by +2.72%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+19.8 mm
2.72%
Speedometer at 100
102.7 km/h
+2.72% error
Ground clearance
+9.9 mm
ride height delta
Sidewall change
-15.5 mm
revs/km: 425.7
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/compare/275-40-r20-vs-315-30-r22Detailed comparison
| Metric | 275/40 R20 | 315/30 R22 | Difference |
|---|---|---|---|
| Overall diameter | 728.0 mm | 747.8 mm | +19.8 mm (+2.72%) |
| Sidewall height | 110.0 mm | 94.5 mm | -15.5 mm |
| Circumference | 2.287 m | 2.349 m | +62.2 mm |
| Revs / km | 437.2 | 425.7 | -11.6 |
| Ground clearance | reference | +9.9 mm | +9.9 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.7 km/h | +2.72 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 102.7 km/h after switching to 315/30 R22 — a +2.72% 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 +9.9 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
275/40 R20
Back to
315/30 R22
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