Comparison
215/60 R17 vs 275/40 R18
Plus-sizing from 215/60 R17 to 275/40 R18 keeps overall diameter close to factory while opening room for a larger 18-inch wheel. This tire combination shifts overall diameter slightly from OEM.
Expect a slight but noticeable shift in indicated speed compared to the original tires. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input. The wider section adds contact patch and lateral stability, while eating into fender and suspension clearance. The larger wheel shows more of the brake hardware and tightens up the wheel-gap look. 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: 275/40 R18 is 12.6 mm shorter than 215/60 R17, shifting the speedometer by -1.83%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-12.6 mm
-1.83%
Speedometer at 100
98.2 km/h
-1.83% error
Ground clearance
-6.3 mm
ride height delta
Sidewall change
-19.0 mm
revs/km: 470.0
Permalink for this comparison:
/compare/215-60-r17-vs-275-40-r18Detailed comparison
| Metric | 215/60 R17 | 275/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 689.8 mm | 677.2 mm | -12.6 mm (-1.83%) |
| Sidewall height | 129.0 mm | 110.0 mm | -19.0 mm |
| Circumference | 2.167 m | 2.127 m | -39.6 mm |
| Revs / km | 461.5 | 470.0 | +8.6 |
| Ground clearance | reference | -6.3 mm | -6.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.2 km/h | -1.83 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 98.2 km/h after switching to 275/40 R18 — a -1.83% 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 -6.3 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
215/60 R17
Back to
275/40 R18
Drivers also compare
Closely-related fitments and plus-size swaps for 215/60 R17 and 275/40 R18.
215/60 R17 vs 235/55 R17
Wider variation on the same rim — more grip, less clearance.
Δ 0.07%
245/45 R18 vs 275/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.07%
225/50 R18 vs 275/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.73%
265/40 R18 vs 275/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 1.20%
235/45 R18 vs 275/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 1.27%
255/45 R18 vs 275/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 1.38%
215/60 R17 vs 225/55 R17
Wider variation on the same rim — more grip, less clearance.
Δ 1.52%
215/60 R17 vs 225/60 R17
Wider variation on the same rim — more grip, less clearance.
Δ 1.74%
Related topics