185/55R15
185/55R15 ships as an OEM size on the Mitsubishi Mirage. At 23.01″ diameter with a 4.01″ sidewall (55% of section width), this size turns 876 revolutions per mile.
About 185/55R15
Factory fitments for 185/55R15 include the Mitsubishi Mirage — meaning replacement tires in this size see steady demand and broad brand availability. At 23.01″ overall diameter, 185/55R15 turns 876 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 55% aspect ratio gives it a moderate sidewall suited to sporty street driving and responsive turn-in. 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 175/55R15 drops diameter by 1.88%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 175/65R15 adds 4.11% 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 23.01″ 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 aliases185/55R15
- Diameter
- 23.01″ / 584.5mm
- Section Width
- 7.28″
- Sidewall
- 4.01″ / 101.75mm
- Circumference
- 72.29″
- Revs/Mile
- 876
175/55R15
- Diameter
- 22.58″ / 573.5mm
- Section Width
- 6.89″
- Sidewall
- 3.79″ / 96.25mm
- Circumference
- 70.93″
- Revs/Mile
- 893
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.87 mph (94.74 km/h). Your speedometer reads 1.88% high versus actual speed.