Comparison
275/40 R22 vs 315/30 R22
315/30 R22 is a lower-profile take on 275/40 R22 — same 22-inch wheel, shorter sidewall. This setup swings rolling diameter far enough to feel on the road.
The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff. The 3–5% diameter gap puts this in caution territory: doable on many cars, but verify clearance and consider recalibration.
TakeSuits drivers who value sharper steering and appearance over outright ride softness.
Quick math: 315/30 R22 is 31.0 mm shorter than 275/40 R22, shifting the speedometer by -3.98%.
Current Tire
New Tire
Ground line · scaled comparison
Slight Difference
Within ±5% — usable, recalibration recommended
Diameter change
-31.0 mm
-3.98%
Speedometer at 100
96.0 km/h
-3.98% error
Ground clearance
-15.5 mm
ride height delta
Sidewall change
-15.5 mm
revs/km: 425.7
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/compare/275-40-r22-vs-315-30-r22Detailed comparison
| Metric | 275/40 R22 | 315/30 R22 | Difference |
|---|---|---|---|
| Overall diameter | 778.8 mm | 747.8 mm | -31.0 mm (-3.98%) |
| Sidewall height | 110.0 mm | 94.5 mm | -15.5 mm |
| Circumference | 2.447 m | 2.349 m | -97.4 mm |
| Revs / km | 408.7 | 425.7 | +16.9 |
| Ground clearance | reference | -15.5 mm | -15.5 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 96.0 km/h | -3.98 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 96.0 km/h after switching to 315/30 R22 — a -3.98% 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 -15.5 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.
Back to
275/40 R22
Back to
315/30 R22
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