P285/40R18
Passenger / P-MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The P285/40R18 tire size features an overall diameter of 26.98 inches, a section width of 11.2 inches (285mm), and rotates 748 times per mile. It is a standard factory tire fitment on 9+ vehicle models including Ford Mustang.
Physical Dimensions & Specs
Overall Diameter
26.98"
685.3 mmSection Width
285 mm
11.22" wideSidewall Height
4.49"
114.0 mm (40% aspect)Revolutions / Mile
748
Circumference: 84.75"Rim Diameter
18"
Wheel sizeRecommended Rim Width
7.1" - 10"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare P285/40R18 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)285/40R18
Overall Height:27.0"
Sidewall:4.5"
Revs/Mile:748
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+9.6%At 60 mph reading, actual speed is 65.8 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 21.9 mph | +1.9 mph |
| 30 mph | 32.9 mph | +2.9 mph |
| 45 mph | 49.3 mph | +4.3 mph |
| 60 mph | 65.8 mph | +5.8 mph |
| 75 mph | 82.2 mph | +7.2 mph |
| 90 mph | 98.7 mph | +8.7 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:+1.30" ground clearance
Vehicles That Fit P285/40R18 (9+ Models)
Factory standard and optional vehicle fitments utilizing P285/40R18 tires: