235/55R19
235/55R19 ships as an OEM size on the Acura RDX, Audi Q5, Dodge Charger. At 29.18″ diameter with a 5.09″ sidewall (55% of section width), this size turns 691 revolutions per mile.
About 235/55R19
Factory fitments for 235/55R19 include the Acura RDX, Audi Q5, Dodge Charger — meaning replacement tires in this size see steady demand and broad brand availability. At 29.18″ overall diameter, 235/55R19 turns 691 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 55% aspect ratio gives it a moderate sidewall suited to sporty street driving and responsive turn-in. The 19″ rim pairing is typical for full-size truck, premium SUV, and sport-sedan platforms, so compatible wheels are easy to source new or used. Going one step shorter to 255/50R19 drops diameter by 0.47%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 245/55R19 adds 1.48% diameter — also inside the safe window, with marginally taller ride height. If you are shopping for a direct replacement, any tire within roughly ±0.7″ of the 29.18″ stock diameter (about ±2% in percentage terms) will keep ABS, TPMS, and odometer readings inside the vehicle's designed tolerance.
Compare with another size
275/65R18 or "33" for inch aliases235/55R19
- Diameter
- 29.18″ / 741.1mm
- Section Width
- 9.25″
- Sidewall
- 5.09″ / 129.25mm
- Circumference
- 91.66″
- Revs/Mile
- 691
225/55R19
- Diameter
- 28.74″ / 730.1mm
- Section Width
- 8.86″
- Sidewall
- 4.87″ / 123.75mm
- Circumference
- 90.3″
- Revs/Mile
- 702
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 59.11 mph (95.13 km/h). Your speedometer reads 1.48% high versus actual speed.