What does 3.25-18 tire mean?

1 Answers
StBryce
07/29/25 9:42pm
3.25-18 indicates: a low-pressure tire with a cross-section width of 3.25 inches and a rim diameter of 18 inches, also known as a bias-ply tire. Below is relevant information about tires: 1. Tire markings: Tire specifications are commonly represented by a set of numbers, where the first number indicates the tire cross-section width, and the latter indicates the rim diameter, in inches. For example, 165/70-R14 means a tire width of 165 millimeters, an aspect ratio of 70, and a rim diameter of 14 inches. 2. Symbol meanings: The letters or symbols in the middle have special meanings: "X" indicates a high-pressure tire; "R" and "Z" indicate radial tires; "-" indicates bias-ply tires. Due to their poor safety, load capacity, and high-speed stability, bias-ply tires are only used in some low-end off-road vehicles and heavy-duty trucks.
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