205/45R17
205/45R17 ships as an OEM size on the Mazda MX-5 Miata. At 24.26″ diameter with a 3.63″ sidewall (45% of section width), this size turns 831 revolutions per mile.
About 205/45R17
Factory fitments for 205/45R17 include the Mazda MX-5 Miata — meaning replacement tires in this size see steady demand and broad brand availability. At 24.26″ overall diameter, 205/45R17 turns 831 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. Stepping up to 215/45R17 adds 1.46% 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 24.26″ 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 aliases205/45R17
- Diameter
- 24.26″ / 616.3mm
- Section Width
- 8.07″
- Sidewall
- 3.63″ / 92.25mm
- Circumference
- 76.23″
- Revs/Mile
- 831
205/50R17
- Diameter
- 25.07″ / 636.8mm
- Section Width
- 8.07″
- Sidewall
- 4.04″ / 102.5mm
- Circumference
- 78.76″
- Revs/Mile
- 804
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 62 mph (99.77 km/h). Your speedometer reads 3.33% low versus actual speed.