285/30R21
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
The 285/30R21 tire size features an overall diameter of 27.73 inches, a section width of 11.2 inches (285mm), and rotates 727 times per mile. It is a standard factory tire fitment on 26+ vehicle models including BMW Alpina.
Physical Dimensions & Specs
Overall Diameter
27.73"
704.3 mmSection Width
285 mm
11.22" wideSidewall Height
3.37"
85.6 mm (30% aspect)Revolutions / Mile
727
Circumference: 87.12"Rim Diameter
21"
Wheel sizeRecommended Rim Width
7.1" - 10"
Optimal rim width rangeWhere to Buy & Install 285/30R21 Tires
Looking for 285/30R21 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
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Speedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 285/30R21 against any proposed tire size below:
Visual Tire & Wheel Comparison
Speedometer Variance
| 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
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Vehicles That Fit 285/30R21 (26+ Models)
Factory standard and optional vehicle fitments utilizing 285/30R21 tires: