215/55R18 vs 235/50R19Tire Size Comparison

Use Caution

The 3.5% diameter difference exceeds 3% and may affect speedometer accuracy.

215/55R18694mm dia235/50R19718mm dia+11.9mm

Comparison Details

Overall Diameter693.7 vs 717.6 mm (+23.9 mm)
Diameter Difference+3.45%
Section Width215 vs 235 mm (+20 mm)
Sidewall Height118.3 vs 117.5 mm (-0.8 mm)
Circumference2179.3 vs 2254.4 mm
Clearance Change+11.9 mm
Speedometer Error+3.45%
Revs/Mile738 vs 714

Speedometer Correction

When switching from 215/55R18 to 235/50R19, your speedometer will differ from actual speed.

SpeedometerActual SpeedDifference
30 km/h31.0 km/h+1.0 km/h
40 km/h41.4 km/h+1.4 km/h
50 km/h51.7 km/h+1.7 km/h
60 km/h62.1 km/h+2.1 km/h
70 km/h72.4 km/h+2.4 km/h
80 km/h82.8 km/h+2.8 km/h
90 km/h93.1 km/h+3.1 km/h
100 km/h103.4 km/h+3.4 km/h
110 km/h113.8 km/h+3.8 km/h
120 km/h124.1 km/h+4.1 km/h
130 km/h134.5 km/h+4.5 km/h

Vehicles Using These Sizes

Vehicles with 215/55R18

2025 Chevrolet TraxRS/Activ2024 Chevrolet TraxRS/Activ

Vehicles with 235/50R19

2025 Hyundai TucsonLimited/N Line2024 Hyundai TucsonLimited/N Line2023 Hyundai TucsonLimited/N Line2022 Hyundai TucsonN Line

Practical Guidance

The 3.5% diameter difference between 215/55R18 and 235/50R19 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 3.45%, width changes by 20mm.

Speedometer error will be 3.45%. At an indicated 100 km/h, actual speed is about 103.5 km/h.

Ground clearance changes by +11.9mm per side.