P245/40R20
Passenger / P-MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The P245/40R20 tire size features an overall diameter of 27.72 inches, a section width of 9.6 inches (245mm), and rotates 728 times per mile. It is a standard factory tire fitment on 40+ vehicle models including Buick Cascada.
Physical Dimensions & Specs
Overall Diameter
27.72"
704.1 mmSection Width
245 mm
9.65" wideSidewall Height
3.86"
98.0 mm (40% aspect)Revolutions / Mile
728
Circumference: 87.07"Rim Diameter
20"
Wheel sizeRecommended Rim Width
6.1" - 8.6"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare P245/40R20 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)245/40R20
Overall Height:27.7"
Sidewall:3.9"
Revs/Mile:728
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+6.7%At 60 mph reading, actual speed is 64.0 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 21.3 mph | +1.3 mph |
| 30 mph | 32.0 mph | +2.0 mph |
| 45 mph | 48.0 mph | +3.0 mph |
| 60 mph | 64.0 mph | +4.0 mph |
| 75 mph | 80.0 mph | +5.0 mph |
| 90 mph | 96.0 mph | +6.0 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:+0.93" ground clearance
Vehicles That Fit P245/40R20 (40+ Models)
Factory standard and optional vehicle fitments utilizing P245/40R20 tires: