305/45R22
305/45R22 is uncommon as OEM fitment but appears as an aftermarket upsize option. At 32.81″ diameter with a 5.40″ sidewall (45% of section width), this size turns 615 revolutions per mile.
About 305/45R22
305/45R22 is less common as a factory fitment but is available as an aftermarket size, so SKU selection is narrower than mainstream OEM sizes. At 32.81″ overall diameter, 305/45R22 turns 615 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 295/45R22 drops diameter by 1.08%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 285/50R22 adds 1.26% 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 32.81″ 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 aliases305/45R22
- Diameter
- 32.81″ / 833.3mm
- Section Width
- 12.01″
- Sidewall
- 5.4″ / 137.25mm
- Circumference
- 103.07″
- Revs/Mile
- 615
285/45R22
- Diameter
- 32.1″ / 815.3mm
- Section Width
- 11.22″
- Sidewall
- 5.05″ / 128.25mm
- Circumference
- 100.84″
- Revs/Mile
- 628
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.7 mph (94.47 km/h). Your speedometer reads 2.16% high versus actual speed.