Comparison
245/45 R18 vs 265/35 R19
Going from 245/45 R18 to 265/35 R19 steps up to a 19-inch rim while trimming sidewall to stay near OEM rolling diameter. This setup lands within OEM rolling-diameter tolerance. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides.
Speedometer drift stays small enough that most drivers won't notice it day to day. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeA solid pick for drivers chasing a more aggressive stance without abandoning OEM rolling diameter.
Quick math: 265/35 R19 is 9.6 mm shorter than 245/45 R18, shifting the speedometer by -1.42%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-9.6 mm
-1.42%
Speedometer at 100
98.6 km/h
-1.42% error
Ground clearance
-4.8 mm
ride height delta
Sidewall change
-17.5 mm
revs/km: 476.4
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/compare/245-45-r18-vs-265-35-r19Detailed comparison
| Metric | 245/45 R18 | 265/35 R19 | Difference |
|---|---|---|---|
| Overall diameter | 677.7 mm | 668.1 mm | -9.6 mm (-1.42%) |
| Sidewall height | 110.3 mm | 92.8 mm | -17.5 mm |
| Circumference | 2.129 m | 2.099 m | -30.2 mm |
| Revs / km | 469.7 | 476.4 | +6.7 |
| Ground clearance | reference | -4.8 mm | -4.8 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.6 km/h | -1.42 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 98.6 km/h after switching to 265/35 R19 — a -1.42% 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 -4.8 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.
Back to
245/45 R18
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265/35 R19
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