Comparison
225/40 R18 vs 275/35 R18
275/35 R18 is a wider variation of 225/40 R18 on the same 18-inch rim, adding 50 mm of tread footprint. This wheel and tire pairing moves rolling diameter a touch off the original spec. The shorter sidewall gives the tire a firmer, more responsive feel and sharpens steering input.
Expect a slight but noticeable shift in indicated speed compared to the original tires. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeReasonable performance-leaning swap as long as fender and suspension clearance check out.
Quick math: 275/35 R18 is 12.5 mm taller than 225/40 R18, shifting the speedometer by +1.96%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+12.5 mm
1.96%
Speedometer at 100
102.0 km/h
+1.96% error
Ground clearance
+6.3 mm
ride height delta
Sidewall change
+6.3 mm
revs/km: 489.9
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/compare/225-40-r18-vs-275-35-r18Detailed comparison
| Metric | 225/40 R18 | 275/35 R18 | Difference |
|---|---|---|---|
| Overall diameter | 637.2 mm | 649.7 mm | +12.5 mm (+1.96%) |
| Sidewall height | 90.0 mm | 96.3 mm | +6.3 mm |
| Circumference | 2.002 m | 2.041 m | +39.3 mm |
| Revs / km | 499.5 | 489.9 | -9.6 |
| Ground clearance | reference | +6.3 mm | +6.3 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.0 km/h | +1.96 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 102.0 km/h after switching to 275/35 R18 — a +1.96% 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
225/40 R18
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275/35 R18
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