195/65R15
195/65R15 ships as an OEM size on the Toyota Prius. At 24.98″ diameter with a 4.99″ sidewall (65% of section width), this size turns 807 revolutions per mile.
About 195/65R15
Factory fitments for 195/65R15 include the Toyota Prius — meaning replacement tires in this size see steady demand and broad brand availability. At 24.98″ overall diameter, 195/65R15 turns 807 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 65% aspect ratio gives it a balanced sidewall — enough compliance for daily comfort without vague steering. The 15″ rim pairing is typical for compact-car and economy-vehicle platforms, so compatible wheels are easy to source new or used. Going one step shorter to 175/70R15 drops diameter by 1.34%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 185/70R15 adds 0.87% 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 24.98″ 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 aliases195/65R15
- Diameter
- 24.98″ / 634.5mm
- Section Width
- 7.68″
- Sidewall
- 4.99″ / 126.75mm
- Circumference
- 78.48″
- Revs/Mile
- 807
175/65R15
- Diameter
- 23.96″ / 608.5mm
- Section Width
- 6.89″
- Sidewall
- 4.48″ / 113.75mm
- Circumference
- 75.26″
- Revs/Mile
- 842
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 57.54 mph (92.6 km/h). Your speedometer reads 4.10% high versus actual speed.