305/30R20 Tire Size Specifications & Compatible Vehicles
Overall Diameter
691.0 mm
Section Width
305 mm
Sidewall Height
91.5 mm
Circumference
2170.8 mm
Revs/Mile
741
Rim Diameter
20"
Inch Equivalent
27.2x12R20
Rim Width (ETRTO)
9.5" – 12.0"
Compatible Vehicles
The following vehicles use 305/30R20 tires from the factory:
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 305/30R20 and may be used as replacements:
Popular Comparisons
See how 305/30R20 compares to other common tire sizes:
Understanding 305/30R20
The tire size 305/30R20 means the tire has a section width of 305mm, an aspect ratio of 30% (the sidewall height is 30% of the width), and fits a 20-inch rim.
Sidewall Height = 305 x 0.3 = 91.5 mm
Overall Diameter = (91.5 x 2) + (20 x 25.4) = 691.0 mm
Circumference = 691.0 x π = 2170.8 mm
Overall Diameter = (91.5 x 2) + (20 x 25.4) = 691.0 mm
Circumference = 691.0 x π = 2170.8 mm
Frequently Asked Questions
The 305/30R20 tire size is used on 7 vehicle trims including the 2024 Chevrolet Camaro, 2023 Chevrolet Camaro, 2022 Chevrolet Camaro and 4 more.
A 305/30R20 tire has an overall diameter of 691.0mm (27.2 inches). The sidewall height is 91.5mm, and the total circumference is 2171mm.
For 305/30R20 tires, the ETRTO recommended rim width is 10.5". The acceptable range is 9.5" minimum to 12.0" maximum. Using a rim outside this range can cause improper bead seating and unsafe handling.
Yes, as long as the replacement tire overall diameter is within 3% of the 305/30R20 691.0mm diameter. Compatible alternatives include 175/45R21, 225/35R21, 315/25R21. Use our Tire Size Calculator to compare any two sizes.