Comparison
225/45 R17 vs 245/45 R17
On the same 17-inch wheel, 245/45 R17 grows the section width by 20 mm versus 225/45 R17. This swap moves rolling diameter a touch off the original spec. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff.
The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeUseful when extra dry grip and stance matter more than a small fuel-economy hit.
Quick math: 245/45 R17 is 18.0 mm taller than 225/45 R17, shifting the speedometer by +2.84%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+18.0 mm
2.84%
Speedometer at 100
102.8 km/h
+2.84% error
Ground clearance
+9.0 mm
ride height delta
Sidewall change
+9.0 mm
revs/km: 488.0
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/compare/225-45-r17-vs-245-45-r17Detailed comparison
| Metric | 225/45 R17 | 245/45 R17 | Difference |
|---|---|---|---|
| Overall diameter | 634.3 mm | 652.3 mm | +18.0 mm (+2.84%) |
| Sidewall height | 101.3 mm | 110.3 mm | +9.0 mm |
| Circumference | 1.993 m | 2.049 m | +56.5 mm |
| Revs / km | 501.8 | 488.0 | -13.8 |
| Ground clearance | reference | +9.0 mm | +9.0 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.8 km/h | +2.84 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 102.8 km/h after switching to 245/45 R17 — a +2.84% 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 +9.0 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.
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225/45 R17
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245/45 R17
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