275/30R21
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
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 rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 275/30R21 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)275/30R21
Overall Height:27.5"
Sidewall:3.2"
Revs/Mile:733
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+7.6%At 60 mph reading, actual speed is 64.5 mph
| 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
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:+1.04" ground clearance
Vehicles That Fit 275/30R21 (4+ Models)
Factory standard and optional vehicle fitments utilizing 275/30R21 tires: