325/30R20
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
Factory Spec Overview
The 325/30R20 tire size features an overall diameter of 27.68 inches, a section width of 12.8 inches (325mm), and rotates 729 times per mile. It is a standard factory tire fitment on 13+ vehicle models including Ford GT.
Physical Dimensions & Specs
Overall Diameter
27.68"
703.1 mmSection Width
325 mm
12.80" wideSidewall Height
3.84"
97.5 mm (30% aspect)Revolutions / Mile
729
Circumference: 86.95"Rim Diameter
20"
Wheel sizeRecommended Rim Width
8.1" - 11.4"
Optimal rim width rangeSpeedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 325/30R20 against any proposed tire size below:
Popular Comparisons:
Tire 1 (Stock / Base)325/30R20
Overall Height:27.7"
Sidewall:3.8"
Revs/Mile:729
Tire 2 (New / Compare)245/60R18
Overall Height:29.6"
Sidewall:5.8"
Revs/Mile:682
Visual Tire & Wheel Comparison
Speedometer Variance
+6.9%At 60 mph reading, actual speed is 64.1 mph
| Indicated | Actual Speed | Diff |
|---|---|---|
| 20 mph | 21.4 mph | +1.4 mph |
| 30 mph | 32.1 mph | +2.1 mph |
| 45 mph | 48.1 mph | +3.1 mph |
| 60 mph | 64.1 mph | +4.1 mph |
| 75 mph | 80.1 mph | +5.1 mph |
| 90 mph | 96.2 mph | +6.2 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:+0.95" ground clearance
Vehicles That Fit 325/30R20 (13+ Models)
Factory standard and optional vehicle fitments utilizing 325/30R20 tires: