235/60R18 vs 255/55R19Tire Size Comparison

Use Caution

The 3.2% diameter difference exceeds 3% and may affect speedometer accuracy.

235/60R18739mm dia255/55R19763mm dia+11.9mm

Comparison Details

Overall Diameter739.2 vs 763.1 mm (+23.9 mm)
Diameter Difference+3.23%
Section Width235 vs 255 mm (+20 mm)
Sidewall Height141.0 vs 140.3 mm (-0.7 mm)
Circumference2322.3 vs 2397.3 mm
Clearance Change+11.9 mm
Speedometer Error+3.23%
Revs/Mile693 vs 671

Speedometer Correction

When switching from 235/60R18 to 255/55R19, your speedometer will differ from actual speed.

SpeedometerActual SpeedDifference
30 km/h31.0 km/h+1.0 km/h
40 km/h41.3 km/h+1.3 km/h
50 km/h51.6 km/h+1.6 km/h
60 km/h61.9 km/h+1.9 km/h
70 km/h72.3 km/h+2.3 km/h
80 km/h82.6 km/h+2.6 km/h
90 km/h92.9 km/h+2.9 km/h
100 km/h103.2 km/h+3.2 km/h
110 km/h113.6 km/h+3.6 km/h
120 km/h123.9 km/h+3.9 km/h
130 km/h134.2 km/h+4.2 km/h

Vehicles Using These Sizes

Vehicles with 235/60R18

2025 Acura RDXBase2025 Acura RDXTechnology2024 Acura RDXBase2023 Acura RDXBase2022 Acura RDXBase2021 Acura RDXBase2020 Acura RDXBase2025 Audi Q5Premium 45 TFSI quattro2024 Audi Q5Premium 45 TFSI quattro2023 Audi Q5Premium 45 TFSI quattro2022 Audi Q5Premium 45 TFSI quattro2021 Audi Q5Premium 45 TFSI quattro2020 Audi Q5Premium 45 TFSI quattro2026 Chevrolet EquinoxLT2025 Chrysler PacificaTouring2024 Chrysler PacificaTouring2023 Chrysler PacificaTouring2022 Chrysler PacificaTouring2021 Chrysler PacificaTouring2026 Honda CR-VEX / EX-L / Sport Hybrid / Sport-L Hybrid / TrailSport Hybrid / FCEV2025 Honda CR-VEX2024 Honda CR-VEX2023 Honda CR-VEX2022 Honda CR-VEX-L/Touring2021 Honda CR-VEX-L/Touring2020 Honda CR-VEX-L/Touring2025 Lexus RXRX 3502025 Lexus RXRX 350h/RX 500h2024 Lexus RXRX 3502024 Lexus RXRX 350h/RX 500h2023 Lexus RXRX 3502023 Lexus RXRX 350h/RX 500h2026 Toyota RAV4XLE / XLE Premium / SE / Limited (18")2025 Volvo XC60Core B5 AWD2024 Volvo XC60Core B5 AWD2023 Volvo XC60B5 Momentum2022 Volvo XC60T5 Momentum2021 Volvo XC60T5 Momentum2020 Volvo XC60T5 Momentum

Vehicles with 255/55R19

2025 Acura MDXBase2024 Acura MDXBase2023 Acura MDXBase2022 Acura MDXBase2025 Audi Q7Premium 55 TFSI quattro2024 Audi Q7Premium 55 TFSI quattro2023 Audi Q7Premium 55 TFSI quattro2022 Audi Q7Premium 55 TFSI quattro2021 Audi Q7Premium 55 TFSI quattro2020 Audi Q7Premium 55 TFSI quattro2025 Genesis GV802.5T Standard2024 Genesis GV802.5T Standard2023 Genesis GV802.5T Standard2022 Genesis GV802.5T Standard2021 Genesis GV802.5T Standard

Individual Tire Size Details

235/60R18
Full specifications, compatible vehicles, and alternatives
255/55R19
Full specifications, compatible vehicles, and alternatives

Practical Guidance

The 3.2% diameter difference between 235/60R18 and 255/55R19 exceeds the standard 3% tolerance. While physically possible, this change will cause noticeable speedometer error and may affect ABS and traction control calibration. Consult a tire professional before making this switch.

The 3% diameter tolerance is a widely accepted industry guideline referenced by the ETRTO and most vehicle manufacturers. When in doubt, consult your vehicle's owner's manual or a qualified tire professional. For U.S. tire safety standards and recalls, see the NHTSA Tire Safety page.

Frequently Asked Questions

Use Caution. The overall diameter differs by 3.23%, width changes by 20mm.

Speedometer error will be 3.23%. At an indicated 100 km/h, actual speed is about 103.2 km/h.

Ground clearance changes by +11.9mm per side.