215/45R17
215/45R17 ships as an OEM size on the Toyota Prius. At 24.62″ diameter with a 3.81″ sidewall (45% of section width), this size turns 819 revolutions per mile.
About 215/45R17
Factory fitments for 215/45R17 include the Toyota Prius — meaning replacement tires in this size see steady demand and broad brand availability. At 24.62″ overall diameter, 215/45R17 turns 819 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 17″ rim pairing is typical for light-truck, crossover, and mid-size SUV applications, so compatible wheels are easy to source new or used. Going one step shorter to 205/45R17 drops diameter by 1.44%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 225/45R17 adds 1.44% 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 24.62″ 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 aliases215/45R17
- Diameter
- 24.62″ / 625.3mm
- Section Width
- 8.46″
- Sidewall
- 3.81″ / 96.75mm
- Circumference
- 77.34″
- Revs/Mile
- 819
205/45R17
- Diameter
- 24.26″ / 616.3mm
- Section Width
- 8.07″
- Sidewall
- 3.63″ / 92.25mm
- Circumference
- 76.23″
- Revs/Mile
- 831
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 59.14 mph (95.17 km/h). Your speedometer reads 1.44% high versus actual speed.