SECTION II. EQUIPMENT DESCRIPTION AND DATA (Con't)
1-9. TIRE MARKINGS AND CODES (Con't).
c. TIRE SIZE CONVERSION.
(1) Most tires received through the military supply system are specific sizes for specific vehicle
applications. However, Table 1-2 does show some common passenger car tire sizes that are compatible
and may be mixed. For example, P185/80R13 is equivalent to BR78-13, BR70-13, and 6.50-13 radial ply
(2) Table 1-2 lists substitute passenger car tires that do not require any inflation adjustment from
the requirements specified in vehicle manuals, vehicle placards, or data plates. However, when converting
tire sizes from one type to another, tire construction must be considered. Radial, belted bias, and bias
constructed tires should not be mixed on the same vehicle. Consideration must also be given to the tread
design. For example, do not mix mud-and- snow tires with regular highway tread tires.
(3) Mixing various tire sizes for other vehicle applications (e.g. Light and Medium Trucks)
should be avoided and is not recommended unless specified in the vehicle technical manual. Truck
suspensions and drive trains are usually designed with a specific tire size and design. A mix of various
truck tire sizes or designs can have degrading and sometimes catastrophic effects on the traction,
cornering and handling characteristics and performance of the vehicle.