235/50R20
235/50R20 ships as an OEM size on the Lexus NX, Toyota Sienna. At 29.25″ diameter with a 4.63″ sidewall (50% of section width), this size turns 689 revolutions per mile.
About 235/50R20
Factory fitments for 235/50R20 include the Lexus NX, Toyota Sienna — meaning replacement tires in this size see steady demand and broad brand availability. At 29.25″ overall diameter, 235/50R20 turns 689 revolutions per mile, which is the reference point the factory speedometer and odometer were calibrated against. The 50% aspect ratio gives it a moderate sidewall suited to sporty street driving and responsive turn-in. The 20″ rim pairing is typical for luxury SUV and performance-oriented platforms, so compatible wheels are easy to source new or used. Going one step shorter to 255/45R20 drops diameter by 0.74%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 245/50R20 adds 1.35% 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 29.25″ 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 aliases235/50R20
- Diameter
- 29.25″ / 743mm
- Section Width
- 9.25″
- Sidewall
- 4.63″ / 117.5mm
- Circumference
- 91.9″
- Revs/Mile
- 689
235/45R20
- Diameter
- 28.33″ / 719.5mm
- Section Width
- 9.25″
- Sidewall
- 4.16″ / 105.75mm
- Circumference
- 88.99″
- Revs/Mile
- 712
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.1 mph (93.51 km/h). Your speedometer reads 3.16% high versus actual speed.