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325/30R20 Tire Size
Order 325/30R20 tires by tire type, service description, brand, mileage warranty, availability, and current price.
Before choosing 325/30R20 tires, match the vehicle-required load index, speed rating, and any applicable load or designation requirements.
All You Need To Know About 325/30R20 Tire Size
The 325/30R20 tire size has a section width of 325 mm (12.795 in), an aspect ratio of 30%, and mounts on a 20-inch wheel diameter, giving a calculated overall diameter of 27.677 inches (703 mm) and a sidewall height of 3.839 inches (97.5 mm). This is a metric tire size with no P, LT, or flotation prefix supplied, so the designation is read directly as section-width/aspect-ratio/R/wheel-diameter, sometimes referred to as Euro-metric or ISO-metric. A 30-series aspect ratio means the sidewall is only 30% as tall as the tire is wide, which, as a general tire-engineering principle, produces a shorter, stiffer sidewall with less flex than a taller-profile tire of the same width. The 325/30R20 tire size pairs a wide 325 mm section width with that short sidewall, a dimensional combination that is calculated directly from the size code rather than inferred from any specific vehicle.
325/30R20 Size Quick Specs
Specification | Value |
Internal Construction | Radial |
Service Description Application | No P, LT, or ST prefix supplied — Euro-metric/ISO-metric passenger-application code |
Rim Width Range | 11.0 - 12.0 in |
Section Width | 325 mm |
Aspect Ratio | 30% |
Rim Diameter | 20 in |
Circumference | 86.950 in (2208.5 mm) |
Revolutions Per Mile | 728.7 rev/mile |
What Vehicles Use 325/30R20?
The 325/30R20 tire size is documented in this exact size on the following vehicles:
- Mercedes-Benz AMG GT R
- Ford GT
- Ferrari 849 Testarossa
To check whether the 325/30R20 tire size is a factory fitment for your specific vehicle, use our VIN lookup tool.
325/30R20 Dimensions in Inches
The 325/30R20 tire size is approximately 12.795 inches wide, 27.677 inches tall overall, with a sidewall approximately 3.839 inches high.
Because the 325/30R20 tire size carries a 30-series aspect ratio, its sidewall is short relative to its width, which as a general principle of tire construction results in a stiffer sidewall with less vertical flex than a taller-profile tire of the same width. This is a dimensional characteristic of the 325/30R20 code itself rather than a claim about any particular vehicle's ride quality.
325/30R20 in Inches: All Measurements
- Width: 12.795 in
- Sidewall Height: 3.839 in
- Wheel Diameter: 20 in
- Overall Diameter: 27.677 in (≈27.7 in)
- Circumference: 86.950 in (≈87.0 in)
Comparison of 325/30R20 With Alternative Tire Sizes
The 325/30R20 tire size is most directly comparable to 305/30R20 and 335/30R20, both selected for documented platform relevance rather than numeric proximity alone: 305/30R20 is documented as a fitment on other Mercedes-Benz AMG GT trims within the same model line as the 325/30R20-equipped AMG GT R, and 335/30R20 shares the identical 30-series aspect ratio and 20-inch wheel diameter as a documented fitment on a comparable ultra-high-performance platform. Calculated overall diameter places 305/30R20 at 27.205 inches (1.71% smaller than 325/30R20) and 335/30R20 at 27.913 inches (0.85% larger), with both differences falling within the commonly used ±3% diameter guideline.
Difference Between 325/30R20 and 305/30R20 Tire Sizes
305/30R20 is a dimensional alternative to 325/30R20 with a calculated overall diameter 1.71% smaller, a difference that falls within the ±3% guideline.
- Width Difference: 305/30R20 is 20 mm (0.787 in) narrower than 325/30R20.
- Diameter Difference: 305/30R20 is 0.472 in (1.71%) smaller in overall diameter than 325/30R20.
- Interchangeability: At 1.71%, the diameter difference passes the ±3% guideline, meaning 305/30R20 is dimensionally eligible for consideration under that guideline — not automatically interchangeable. Wheel-width compatibility, load capacity, clearance, and vehicle requirements must still be verified with a tire professional.
- Practical Difference: The 20 mm narrower section width of 305/30R20 corresponds to a smaller contact-patch footprint width, and the 0.472 in smaller overall diameter corresponds to a proportionally smaller rolling circumference than 325/30R20.
Difference Between 325/30R20 and 335/30R20 Tire Sizes
335/30R20 is a dimensional alternative to 325/30R20 with a calculated overall diameter 0.85% larger, a difference that falls within the ±3% guideline.
- Width Difference: 335/30R20 is 10 mm (0.394 in) wider than 325/30R20.
- Diameter Difference: 335/30R20 is 0.236 in (0.85%) larger in overall diameter than 325/30R20.
- Interchangeability: At 0.85%, the diameter difference passes the ±3% guideline, meaning 335/30R20 is dimensionally eligible for consideration under that guideline — not automatically interchangeable. Wheel-width compatibility, load capacity, clearance, and vehicle requirements must still be verified with a tire professional.
- Practical Difference: The 10 mm wider section width of 335/30R20 corresponds to a larger contact-patch footprint width, and the 0.236 in larger overall diameter corresponds to a proportionally larger rolling circumference than 325/30R20.
All You Need To Know About 325/30R20 Tire Size
The 325/30R20 tire size has a section width of 325 mm (12.795 in), an aspect ratio of 30%, and mounts on a 20-inch wheel diameter, giving a calculated overall diameter of 27.677 inches (703 mm) and a sidewall height of 3.839 inches (97.5 mm). This is a metric tire size with no P, LT, or flotation prefix supplied, so the designation is read directly as section-width/aspect-ratio/R/wheel-diameter, sometimes referred to as Euro-metric or ISO-metric. A 30-series aspect ratio means the sidewall is only 30% as tall as the tire is wide, which, as a general tire-engineering principle, produces a shorter, stiffer sidewall with less flex than a taller-profile tire of the same width. The 325/30R20 tire size pairs a wide 325 mm section width with that short sidewall, a dimensional combination that is calculated directly from the size code rather than inferred from any specific vehicle.
325/30R20 Size Quick Specs
Specification | Value |
Internal Construction | Radial |
Service Description Application | No P, LT, or ST prefix supplied — Euro-metric/ISO-metric passenger-application code |
Rim Width Range | 11.0 - 12.0 in |
Section Width | 325 mm |
Aspect Ratio | 30% |
Rim Diameter | 20 in |
Circumference | 86.950 in (2208.5 mm) |
Revolutions Per Mile | 728.7 rev/mile |
What Vehicles Use 325/30R20?
The 325/30R20 tire size is documented in this exact size on the following vehicles:
- Mercedes-Benz AMG GT R
- Ford GT
- Ferrari 849 Testarossa
To check whether the 325/30R20 tire size is a factory fitment for your specific vehicle, use our VIN lookup tool.
325/30R20 Dimensions in Inches
The 325/30R20 tire size is approximately 12.795 inches wide, 27.677 inches tall overall, with a sidewall approximately 3.839 inches high.
Because the 325/30R20 tire size carries a 30-series aspect ratio, its sidewall is short relative to its width, which as a general principle of tire construction results in a stiffer sidewall with less vertical flex than a taller-profile tire of the same width. This is a dimensional characteristic of the 325/30R20 code itself rather than a claim about any particular vehicle's ride quality.
325/30R20 in Inches: All Measurements
- Width: 12.795 in
- Sidewall Height: 3.839 in
- Wheel Diameter: 20 in
- Overall Diameter: 27.677 in (≈27.7 in)
- Circumference: 86.950 in (≈87.0 in)
Comparison of 325/30R20 With Alternative Tire Sizes
The 325/30R20 tire size is most directly comparable to 305/30R20 and 335/30R20, both selected for documented platform relevance rather than numeric proximity alone: 305/30R20 is documented as a fitment on other Mercedes-Benz AMG GT trims within the same model line as the 325/30R20-equipped AMG GT R, and 335/30R20 shares the identical 30-series aspect ratio and 20-inch wheel diameter as a documented fitment on a comparable ultra-high-performance platform. Calculated overall diameter places 305/30R20 at 27.205 inches (1.71% smaller than 325/30R20) and 335/30R20 at 27.913 inches (0.85% larger), with both differences falling within the commonly used ±3% diameter guideline.
Difference Between 325/30R20 and 305/30R20 Tire Sizes
305/30R20 is a dimensional alternative to 325/30R20 with a calculated overall diameter 1.71% smaller, a difference that falls within the ±3% guideline.
- Width Difference: 305/30R20 is 20 mm (0.787 in) narrower than 325/30R20.
- Diameter Difference: 305/30R20 is 0.472 in (1.71%) smaller in overall diameter than 325/30R20.
- Interchangeability: At 1.71%, the diameter difference passes the ±3% guideline, meaning 305/30R20 is dimensionally eligible for consideration under that guideline — not automatically interchangeable. Wheel-width compatibility, load capacity, clearance, and vehicle requirements must still be verified with a tire professional.
- Practical Difference: The 20 mm narrower section width of 305/30R20 corresponds to a smaller contact-patch footprint width, and the 0.472 in smaller overall diameter corresponds to a proportionally smaller rolling circumference than 325/30R20.
Difference Between 325/30R20 and 335/30R20 Tire Sizes
335/30R20 is a dimensional alternative to 325/30R20 with a calculated overall diameter 0.85% larger, a difference that falls within the ±3% guideline.
- Width Difference: 335/30R20 is 10 mm (0.394 in) wider than 325/30R20.
- Diameter Difference: 335/30R20 is 0.236 in (0.85%) larger in overall diameter than 325/30R20.
- Interchangeability: At 0.85%, the diameter difference passes the ±3% guideline, meaning 335/30R20 is dimensionally eligible for consideration under that guideline — not automatically interchangeable. Wheel-width compatibility, load capacity, clearance, and vehicle requirements must still be verified with a tire professional.
- Practical Difference: The 10 mm wider section width of 335/30R20 corresponds to a larger contact-patch footprint width, and the 0.236 in larger overall diameter corresponds to a proportionally larger rolling circumference than 325/30R20.
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