265/65R20
265/65R20 is uncommon as OEM fitment but appears as an aftermarket upsize option. At 33.56″ diameter with a 6.78″ sidewall (65% of section width), this size turns 601 revolutions per mile.
About 265/65R20
265/65R20 is less common as a factory fitment but is available as an aftermarket size, so SKU selection is narrower than mainstream OEM sizes. At 33.56″ overall diameter, 265/65R20 turns 601 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 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 255/65R20 drops diameter by 1.52%, which stays within the ±3% fitment safe zone for most vehicles. Stepping up to 275/65R20 adds 1.52% 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 33.56″ 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 aliases265/65R20
- Diameter
- 33.56″ / 852.5mm
- Section Width
- 10.43″
- Sidewall
- 6.78″ / 172.25mm
- Circumference
- 105.44″
- Revs/Mile
- 601
245/65R20
- Diameter
- 32.54″ / 826.5mm
- Section Width
- 9.65″
- Sidewall
- 6.27″ / 159.25mm
- Circumference
- 102.23″
- Revs/Mile
- 620
Speedometer & Diameter Impact
At an indicated 60 mph, your actual speed is 58.17 mph (93.62 km/h). Your speedometer reads 3.05% high versus actual speed.