Comparison
245/45 R20 vs 295/40 R20
295/40 R20 is a wider variation of 245/45 R20 on the same 20-inch rim, adding 50 mm of tread footprint. This sizing approach trims or stretches rolling diameter by a small margin. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides.
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: 295/40 R20 is 15.5 mm taller than 245/45 R20, shifting the speedometer by +2.13%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
+15.5 mm
2.13%
Speedometer at 100
102.1 km/h
+2.13% error
Ground clearance
+7.8 mm
ride height delta
Sidewall change
+7.8 mm
revs/km: 427.8
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/compare/245-45-r20-vs-295-40-r20Detailed comparison
| Metric | 245/45 R20 | 295/40 R20 | Difference |
|---|---|---|---|
| Overall diameter | 728.5 mm | 744.0 mm | +15.5 mm (+2.13%) |
| Sidewall height | 110.3 mm | 118.0 mm | +7.8 mm |
| Circumference | 2.289 m | 2.337 m | +48.7 mm |
| Revs / km | 436.9 | 427.8 | -9.1 |
| Ground clearance | reference | +7.8 mm | +7.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 102.1 km/h | +2.13 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 102.1 km/h after switching to 295/40 R20 — a +2.13% 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 +7.8 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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245/45 R20
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295/40 R20
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