235/45R17
235/45R17 ships as an OEM size on the Subaru WRX. At 25.33″ diameter with a 4.16″ sidewall (45% of section width), this size turns 796 revolutions per mile.
About 235/45R17
Factory fitments for 235/45R17 include the Subaru WRX — meaning replacement tires in this size see steady demand and broad brand availability. At 25.33″ overall diameter, 235/45R17 turns 796 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 225/45R17 drops diameter by 1.40%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 215/50R17 adds 0.54% 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 25.33″ 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 aliases235/45R17
- Diameter
- 25.33″ / 643.3mm
- Section Width
- 9.25″
- Sidewall
- 4.16″ / 105.75mm
- Circumference
- 79.57″
- Revs/Mile
- 796
215/45R17
- Diameter
- 24.62″ / 625.3mm
- Section Width
- 8.46″
- Sidewall
- 3.81″ / 96.75mm
- Circumference
- 77.34″
- Revs/Mile
- 819
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.32 mph (93.86 km/h). Your speedometer reads 2.80% high versus actual speed.