275/40R22
275/40R22 ships as an OEM size on the BMW X7. At 30.66″ diameter with a 4.33″ sidewall (40% of section width), this size turns 658 revolutions per mile.
About 275/40R22
Factory fitments for 275/40R22 include the BMW X7 — meaning replacement tires in this size see steady demand and broad brand availability. At 30.66″ overall diameter, 275/40R22 turns 658 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 40% aspect ratio gives it a low-profile sidewall that delivers sharp steering response but transmits road imperfections. The 22″ rim pairing is typical for heavy-duty, off-road-lifted, and show-build applications, so compatible wheels are easy to source new or used. Going one step shorter to 265/40R22 drops diameter by 1.03%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 285/40R22 adds 1.03% 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 30.66″ 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 aliases275/40R22
- Diameter
- 30.66″ / 778.8mm
- Section Width
- 10.83″
- Sidewall
- 4.33″ / 110mm
- Circumference
- 96.33″
- Revs/Mile
- 658
265/35R22
- Diameter
- 29.3″ / 744.3mm
- Section Width
- 10.43″
- Sidewall
- 3.65″ / 92.75mm
- Circumference
- 92.06″
- Revs/Mile
- 688
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 57.34 mph (92.28 km/h). Your speedometer reads 4.43% high versus actual speed.