325/30R20
Standard MetricFactory Specs, Physical Dimensions & Compatible Vehicle Applications
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 rangeWhere to Buy & Install 325/30R20 Tires
Looking for 325/30R20 tires? Skip hauling tires in your car—choose direct delivery to a local certified shop or doorstep delivery:
Tire Rack
Free shipping directly to over 10,000+ certified local installers.
- ✓Delivered to local installer (Firestone, Discount Tire & local shops)
- ✓Mobile installation available — mount & balance right in your driveway
- ✓Free 2-year road hazard warranty on most eligible tire models
Amazon Automotive
Fast doorstep shipping for DIYers or bringing to your own shop.
- ✓Prime doorstep shipping for home garages or spares
- ✓Huge range of budget and specialty tire sizes in stock
- ✓Ideal if you have a local independent mechanic you prefer
As an affiliate for Tire Rack and Amazon, we earn from qualifying purchases at no extra cost to you.
Speedometer & Alternate Size Calculator
Testing an alternate size for your vehicle? Compare 325/30R20 against any proposed tire size below:
Visual Tire & Wheel Comparison
Speedometer Variance
| 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
Flush fitment. Extends 17.7mm outwards. Check wheel arch clearance under full suspension compression.
Vehicles That Fit 325/30R20 (13+ Models)
Factory standard and optional vehicle fitments utilizing 325/30R20 tires: