275/45R22
275/45R22 ships as an OEM size on the Ram 1500. At 31.74″ diameter with a 4.87″ sidewall (45% of section width), this size turns 635 revolutions per mile.
About 275/45R22
Factory fitments for 275/45R22 include the Ram 1500 — meaning replacement tires in this size see steady demand and broad brand availability. At 31.74″ overall diameter, 275/45R22 turns 635 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 45% 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 265/45R22 drops diameter by 1.12%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 285/45R22 adds 1.12% 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 31.74″ 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 aliases275/45R22
- Diameter
- 31.74″ / 806.3mm
- Section Width
- 10.83″
- Sidewall
- 4.87″ / 123.75mm
- Circumference
- 99.73″
- Revs/Mile
- 635
265/40R22
- Diameter
- 30.35″ / 770.8mm
- Section Width
- 10.43″
- Sidewall
- 4.17″ / 106mm
- Circumference
- 95.34″
- Revs/Mile
- 665
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 57.36 mph (92.31 km/h). Your speedometer reads 4.40% high versus actual speed.