285/30R18
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
The 285/30R18 tire size features an overall diameter of 24.73 inches, a section width of 11.2 inches (285mm), and rotates 815 times per mile. It is a standard factory tire fitment on 7+ vehicle models including Porsche 911.
Physical Dimensions & Specs
Overall Diameter
24.73"
628.1 mmSection Width
285 mm
11.22" wideSidewall Height
3.37"
85.6 mm (30% aspect)Revolutions / Mile
815
Circumference: 77.7"Rim Diameter
18"
Wheel sizeRecommended Rim Width
7.1" - 10"
Optimal rim width rangeWhere to Buy & Install 285/30R18 Tires
Looking for 285/30R18 tires? Skip hauling tires in your car—choose direct delivery to a local certified shop or doorstep delivery:
Tire Rack
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Amazon Automotive
Fast doorstep shipping for DIYers or bringing to your own shop.
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Speedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 285/30R18 against any proposed tire size below:
Visual Tire & Wheel Comparison
Speedometer Variance
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 23.9 mph | +3.9 mph |
| 30 mph | 35.9 mph | +5.9 mph |
| 45 mph | 53.8 mph | +8.8 mph |
| 60 mph | 71.7 mph | +11.7 mph |
| 75 mph | 89.7 mph | +14.7 mph |
| 90 mph | 107.6 mph | +17.6 mph |
Fender & Suspension Clearance
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Vehicles That Fit 285/30R18 (7+ Models)
Factory standard and optional vehicle fitments utilizing 285/30R18 tires: