The 275/45R20 is a common tire size for SUVs and crossovers such as Toyota RAV4, Honda CR-V, and Ford Explorer.
With a 123.8 mm sidewall (45% aspect ratio), this tire offers a balanced blend of ride comfort and handling precision — versatile for both city driving and spirited cornering.
Compared to the baseline 265/50R20, this tire's overall diameter differs by -2.3% — a speedometer calibrated for 265/50R20 would read 102.3 km/h at an actual 100 km/h.
OE on the Porsche Cayenne Turbo (958 20" pkg, paired with 305/40R20 rear) and various performance-SUV front fitments. Load index 110Y or 114Y reinforced. Performance-SUV front fitment; rear pairs are typically 305/40R20 or 315/35R21.
Large-rim luxury-SUV sizes prioritize acoustic refinement and curb-weight load capacity over off-road versatility. Self-sealing and runflat constructions are common OE on these fitments; replacing a runflat with a conventional tire requires confirming the TPMS module and spare-tire provisioning since most platforms ship without a spare. Air-suspension calibration is also tied to rolling diameter — staying within ±1% of OE is recommended on Range Rover and BMW X5/X7 platforms.
| Tire Code | 275/45R20 |
| Section Width | 275 mm |
| Aspect Ratio | 45% |
| Rim Diameter | 20" |
| Sidewall Height | 123.8 mm |
| Overall Diameter | 755.5 mm / 29.74" |
| Circumference | 2373.5 mm / 93.44" |
| Revolutions per km | 421.3 |
| Revolutions per mile | 678.1 |
| Tire Code | OD (mm) | Δ mm | Δ % | Speedo at 100 km/h |
|---|---|---|---|---|
| 255/45R20 | 737.5 | -18.0 | -2.4% | 102.4 |
| 265/45R20 | 746.5 | -9.0 | -1.2% | 101.2 |
| 275/45R20 (current) | 755.5 | — | — | 100.0 |
| 275/55R20 | 810.5 | +55.0 | +7.3% | 93.2 |