285/45R20
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The 285/45R20 tire size features an overall diameter of 30.1 inches, a section width of 11.2 inches (285mm), and rotates 670 times per mile. It is a standard factory tire fitment on 24+ vehicle models including Audi Q7.
Physical Dimensions & Specs
Overall Diameter
30.1"
764.5 mmSection Width
285 mm
11.22" wideSidewall Height
5.05"
128.3 mm (45% aspect)Revolutions / Mile
670
Circumference: 94.56"Rim Diameter
20"
Wheel sizeRecommended Rim Width
7.1" - 10"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 285/45R20 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)285/45R20
Overall Height:30.1"
Sidewall:5.0"
Revs/Mile:670
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
-1.7%At 60 mph reading, actual speed is 59.0 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 19.7 mph | -0.3 mph |
| 30 mph | 29.5 mph | -0.5 mph |
| 45 mph | 44.2 mph | -0.8 mph |
| 60 mph | 59.0 mph | -1.0 mph |
| 75 mph | 73.7 mph | -1.3 mph |
| 90 mph | 88.4 mph | -1.6 mph |
Fender & Suspension Clearance
Fitment Status: MODERATE RISK
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Inner Strut Space:7.7mm LESS clearance
Outer Fender Push:Extends 17.7mm further out
Ride Height Delta:-0.26" lower ground clearance
Vehicles That Fit 285/45R20 (24+ Models)
Factory standard and optional vehicle fitments utilizing 285/45R20 tires: