315/30R20
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The 315/30R20 tire size features an overall diameter of 27.44 inches, a section width of 12.4 inches (315mm), and rotates 735 times per mile. It is a standard factory tire fitment on 3+ vehicle models including Ford Mustang.
Physical Dimensions & Specs
Overall Diameter
27.44"
697.0 mmSection Width
315 mm
12.40" wideSidewall Height
3.72"
94.5 mm (30% aspect)Revolutions / Mile
735
Circumference: 86.21"Rim Diameter
20"
Wheel sizeRecommended Rim Width
7.9" - 11"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 315/30R20 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)315/30R20
Overall Height:27.4"
Sidewall:3.7"
Revs/Mile:735
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+7.8%At 60 mph reading, actual speed is 64.7 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 21.6 mph | +1.6 mph |
| 30 mph | 32.3 mph | +2.3 mph |
| 45 mph | 48.5 mph | +3.5 mph |
| 60 mph | 64.7 mph | +4.7 mph |
| 75 mph | 80.8 mph | +5.8 mph |
| 90 mph | 97.0 mph | +7.0 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:+1.07" ground clearance
Vehicles That Fit 315/30R20 (3+ Models)
Factory standard and optional vehicle fitments utilizing 315/30R20 tires: