255/35R19 vs 235/35R19
235/35R19 has an overall diameter of 647.1 mm (25.48") compared with 661.1 mm (26.03") for 255/35R19, a difference of -14.0 mm (-2.12 %). The sidewall changes by -7.0 mm, section width by -20 mm and ride height by -7.0 mm. Using the ETRTO rolling circumference, 255/35R19 turns 496 times per kilometre and 235/35R19 turns 507 times. With 235/35R19 fitted to a car calibrated for 255/35R19, 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 | 255/35R19 | 235/35R19 | Difference |
|---|---|---|---|
| Section width | 255 mm | 235 mm | -20 mm |
| Sidewall height | 89.3 mm | 82.3 mm | -7.0 mm |
| Rim diameter | 19" | 19" | 0.0" |
| Overall diameter | 661.1 mm (26.03") | 647.1 mm (25.48") | -14.0 mm (-2.12 %) |
| Static circumference | 2077 mm | 2033 mm | -44 mm |
| Rolling circumference (ETRTO) | 2016 mm | 1974 mm | -43 mm |
| Revs per km | 496 | 507 | +11 |
| Ride height | -7.0 mm | ||
| Inch equivalent | 26x10R19 | 25.5×9.3R19 | |
| Approved rim widths (approx.) | 8.5″–10″ | 8″–9.5″ |
Speedometer error
| Speedo reads | 40 | 50 | 60 | 80 | 100 | 110 |
|---|---|---|---|---|---|---|
| Actual speed (km/h) | 39.2 | 48.9 | 58.7 | 78.3 | 97.9 | 107.7 |
| Error (km/h) | -0.8 | -1.1 | -1.3 | -1.7 | -2.1 | -2.3 |
Assumes the speedo was accurate on 255/35R19. Odometer records 102.2 km for every 100 km actually driven.
- The 235/35R19 is 14 mm (2.12 %) smaller in diameter, so your speedo will read high and your odometer will over-record distance.
- Section width changes by -20 mm. Check guard, strut and inner-arch clearance and that the rim width is within the approved range for the new tyre.
Is 235/35R19 legal in Australia? More info needed
| Overall diameter (VSB 14 LS 4.2.4) Diameter change of -14.0 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 235/35R19 instead of 255/35R19?
Overall diameter changes by -14.0 mm (-2.12 %). 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 235/35R19?
Your speedo will read high by about 2.12 %. At an indicated 100 km/h you would actually be travelling 97.9 km/h, and at 110 km/h about 107.7 km/h.
What is the rolling circumference of 235/35R19?
Static circumference is 2033 mm; the ETRTO rolling circumference under load is about 1974 mm, which is 507 revolutions per kilometre.
235/35R19 in inches
235/35R19 is approximately 25.5×9.3R19: 25.5" tall, 9.3" wide, on a 19" rim, with a 3.2" sidewall.
Buying tyres for your business?
Onyx Tyres supplies workshops, retailers and fleets across Australia at wholesale prices. Open a trade account to see stock and pricing and order online.