285/65R17 vs 275/55R19
275/55R19 has an overall diameter of 785.1 mm (30.91") compared with 802.3 mm (31.59") for 285/65R17, a difference of -17.2 mm (-2.14 %). The sidewall changes by -34.0 mm, section width by -10 mm and ride height by -8.6 mm. Using the ETRTO rolling circumference, 285/65R17 turns 409 times per kilometre and 275/55R19 turns 418 times. With 275/55R19 fitted to a car calibrated for 285/65R17, an indicated 100 km/h is a true 97.9 km/h, and the odometer records 102.2 km for every 100 km driven. This is close to the commonly quoted 3 % tolerance, so check clearance and local rules.
Full comparison
| Measurement | 285/65R17 | 275/55R19 | Difference |
|---|---|---|---|
| Section width | 285 mm | 275 mm | -10 mm |
| Sidewall height | 185.3 mm | 151.3 mm | -34.0 mm |
| Rim diameter | 17" | 19" | +2.0" |
| Overall diameter | 802.3 mm (31.59") | 785.1 mm (30.91") | -17.2 mm (-2.14 %) |
| Static circumference | 2520 mm | 2466 mm | -54 mm |
| Rolling circumference (ETRTO) | 2447 mm | 2395 mm | -52 mm |
| Revs per km | 409 | 418 | +9 |
| Ride height | -8.6 mm | ||
| Inch equivalent | 31.6×11.2R17 | 30.9×10.8R19 | |
| Approved rim widths (approx.) | 8″–9.5″ | 7.5″–9.5″ |
Speedometer error
| Speedo reads | 40 | 50 | 60 | 80 | 100 | 110 |
|---|---|---|---|---|---|---|
| Actual speed (km/h) | 39.1 | 48.9 | 58.7 | 78.3 | 97.9 | 107.6 |
| Error (km/h) | -0.9 | -1.1 | -1.3 | -1.7 | -2.1 | -2.4 |
Assumes the speedo was accurate on 285/65R17. Odometer records 102.2 km for every 100 km actually driven.
- The 275/55R19 is 17.2 mm (2.14 %) smaller in diameter, so your speedo will read high and your odometer will over-record distance.
- Section width changes by -10 mm. Check guard, strut and inner-arch clearance and that the rim width is within the approved range for the new tyre.
- Rim diameter changes from 17" to 19", so new wheels are required.
Is 275/55R19 legal in Australia? More info needed
| Overall diameter (VSB 14 LS 4.2.4) Diameter change of -17.2 mm is within the +15 mm / -26 mm allowance for a passenger car (MA/MB) (measured against the largest size the manufacturer designates for the model). | OK |
| Speedometer (ADR 18/03) A smaller tyre makes the speedo read high: at an indicated 100 km/h you would be doing 97.9 km/h (over-read 2.1 km/h; ADR 18 allows up to 13.8 km/h at that speed). | OK |
| Load index (tyre placard / ADR 42) Enter the placard load index and the replacement tyre load index to check. | ? |
| Speed rating (tyre placard / ADR 42) Enter the placard speed rating and the replacement tyre speed rating to check. | ? |
Frequently asked
Can I fit 275/55R19 instead of 285/65R17?
Overall diameter changes by -17.2 mm (-2.14 %). That is close to the 3 % rule of thumb; it may fit, but check guard, strut and brake clearance and your local rules. In Australia VSB 14 allows up to +15 mm for passenger cars and +50 mm for 4WDs/goods vehicles without certification.
How much will my speedo be out with 275/55R19?
Your speedo will read high by about 2.14 %. At an indicated 100 km/h you would actually be travelling 97.9 km/h, and at 110 km/h about 107.6 km/h.
What is the rolling circumference of 275/55R19?
Static circumference is 2466 mm; the ETRTO rolling circumference under load is about 2395 mm, which is 418 revolutions per kilometre.
275/55R19 in inches
275/55R19 is approximately 30.9×10.8R19: 30.9" tall, 10.8" wide, on a 19" rim, with a 6.0" sidewall.
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