325/30R21
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
The 325/30R21 tire size features an overall diameter of 28.68 inches, a section width of 12.8 inches (325mm), and rotates 703 times per mile. It is a standard factory tire fitment on 15+ vehicle models including BMW X6 M, BMW X5 M.
Physical Dimensions & Specs
Overall Diameter
28.68"
728.5 mmSection Width
325 mm
12.80" wideSidewall Height
3.84"
97.5 mm (30% aspect)Revolutions / Mile
703
Circumference: 90.09"Rim Diameter
21"
Wheel sizeRecommended Rim Width
8.1" - 11.4"
Optimal rim width rangeWhere to Buy & Install 325/30R21 Tires
Looking for 325/30R21 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
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 325/30R21 against any proposed tire size below:
Visual Tire & Wheel Comparison
Speedometer Variance
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 20.6 mph | +0.6 mph |
| 30 mph | 30.9 mph | +0.9 mph |
| 45 mph | 46.4 mph | +1.4 mph |
| 60 mph | 61.9 mph | +1.9 mph |
| 75 mph | 77.3 mph | +2.3 mph |
| 90 mph | 92.8 mph | +2.8 mph |
Fender & Suspension Clearance
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Vehicles That Fit 325/30R21 (15+ Models)
Factory standard and optional vehicle fitments utilizing 325/30R21 tires: