275/30R21
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
The 275/30R21 tire size features an overall diameter of 27.5 inches, a section width of 10.8 inches (275mm), and rotates 733 times per mile. It is a standard factory tire fitment on 4+ vehicle models including Audi RS 7.
Physical Dimensions & Specs
Overall Diameter
27.5"
698.5 mmSection Width
275 mm
10.83" wideSidewall Height
3.25"
82.5 mm (30% aspect)Revolutions / Mile
733
Circumference: 86.38"Rim Diameter
21"
Wheel sizeRecommended Rim Width
6.9" - 9.6"
Optimal rim width rangeWhere to Buy & Install 275/30R21 Tires
Looking for 275/30R21 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 275/30R21 against any proposed tire size below:
Visual Tire & Wheel Comparison
Speedometer Variance
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 21.5 mph | +1.5 mph |
| 30 mph | 32.3 mph | +2.3 mph |
| 45 mph | 48.4 mph | +3.4 mph |
| 60 mph | 64.5 mph | +4.5 mph |
| 75 mph | 80.7 mph | +5.7 mph |
| 90 mph | 96.8 mph | +6.8 mph |
Fender & Suspension Clearance
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Vehicles That Fit 275/30R21 (4+ Models)
Factory standard and optional vehicle fitments utilizing 275/30R21 tires: