265/55R19
265/55R19 ships as an OEM size on the Mazda CX-90. At 30.48″ diameter with a 5.74″ sidewall (55% of section width), this size turns 662 revolutions per mile.
About 265/55R19
Factory fitments for 265/55R19 include the Mazda CX-90 — meaning replacement tires in this size see steady demand and broad brand availability. At 30.48″ overall diameter, 265/55R19 turns 662 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 255/55R19 drops diameter by 1.42%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 245/60R19 adds 0.32% 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 30.48″ 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 aliases265/55R19
- Diameter
- 30.48″ / 774.1mm
- Section Width
- 10.43″
- Sidewall
- 5.74″ / 145.75mm
- Circumference
- 95.74″
- Revs/Mile
- 662
245/55R19
- Diameter
- 29.61″ / 752.1mm
- Section Width
- 9.65″
- Sidewall
- 5.31″ / 134.75mm
- Circumference
- 93.02″
- Revs/Mile
- 681
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.29 mph (93.82 km/h). Your speedometer reads 2.84% high versus actual speed.