Comparison
195/60 R16 vs 245/40 R18
Switching from 195/60 R16 to 245/40 R18 is a plus-2 upgrade that wraps a shorter sidewall around a larger 18-inch wheel. This tire combination trims or stretches rolling diameter by a small margin.
The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. Less sidewall flex usually translates to crisper turn-in and a slightly stiffer ride over rough pavement. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff. Visually, the bigger wheel fills the arch and gives the car a more aggressive stance. 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: 245/40 R18 is 12.8 mm taller than 195/60 R16, shifting the speedometer by +2.00%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+12.8 mm
2.00%
Speedometer at 100
102.0 km/h
+2.00% error
Ground clearance
+6.4 mm
ride height delta
Sidewall change
-19.0 mm
revs/km: 487.3
Permalink for this comparison:
/compare/195-60-r16-vs-245-40-r18Detailed comparison
| Metric | 195/60 R16 | 245/40 R18 | Difference |
|---|---|---|---|
| Overall diameter | 640.4 mm | 653.2 mm | +12.8 mm (+2.00%) |
| Sidewall height | 117.0 mm | 98.0 mm | -19.0 mm |
| Circumference | 2.012 m | 2.052 m | +40.2 mm |
| Revs / km | 497.0 | 487.3 | -9.7 |
| Ground clearance | reference | +6.4 mm | +6.4 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.0 km/h | +2.00 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 245/40 R18 — a +2.00% 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 +6.4 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
195/60 R16
Back to
245/40 R18
Drivers also compare
Closely-related fitments and plus-size swaps for 195/60 R16 and 245/40 R18.
215/45 R18 vs 245/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.38%
195/60 R16 vs 215/55 R16
Wider variation on the same rim — more grip, less clearance.
Δ 0.39%
245/40 R18 vs 275/35 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.54%
225/45 R18 vs 245/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 0.99%
245/40 R18 vs 255/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 1.22%
235/40 R18 vs 245/40 R18
Wider variation on the same rim — more grip, less clearance.
Δ 1.24%
195/60 R16 vs 205/55 R16
Wider variation on the same rim — more grip, less clearance.
Δ 1.33%
195/60 R16 vs 225/50 R16
Wider variation on the same rim — more grip, less clearance.
Δ 1.41%
Related topics