Tire Size Designations

Tire size may contain prefix and / or suffix letters as part of tire size designation to identify service conditions which may require different tire loads and inflation pressures.

Prefix Letters

Prefix letters come in front of tire size, like P225/55R15 or ST195/75R14.

AT - Indicates a tire intended for service on All-Terrain vehicles.

DH - Indicates a tire intended for agricultural and logging service (tire must be mounted on a DH drop center rim).

IF - Indicates an agricultural tire thay operates at 20% higher rated load than standard metric tires at the same inflation pressure.

K - Indicates a tire intended for 3-wheeled motorized vehicles without camber steering.

LT - Indicates a tire primarily intended for service on light trucks and pickups.

P - Indicates a tire primarily intended for service on passenger cars.

ST - Indicates a special tire for highway service trailers.

T - Indicates a tire intended for one-position temporary use as a spare only.

VA - Indicates a tire intended for agricultural and logging service (must be mounted on a VA multipiece rim).

VF - Indicates an agricultural tire that operates at 40% higher rated load than standard metric tires at the same inflation pressure.

Suffix Letters

Suffix letters come after tire size, like 33x12.50R15LT.

CFO - Indicates a Cyclic Field Operation tire intended for agricultural usage.

DT - Indicates a tire primarily designed for sand and paver service.

FI - Indicates an implement tire for agricultural towed highway service.

HC - Indicates a tire with a 17.5 rim diameter intended for service on low platform trailers.

IMP - Indicates a tire designed primarily for agricultural machines, implements or trailers which are not suitable for sustained high torque service.

IND - Indicates a drive wheel tractor tire used in industrial service.

K - Indicates a compactor tire for use on 5° drop center or semi-drop center rims having bead seats with nominal minus 0.032 diameter.

LT - Indicates a tire intended for service on Trucks, Busses, Trailers and Multipurpose Passenger Vehicles used in normal highway service.

M/C - Indicates tires and rims for certain motorcycles.

MH - Indicates a tire intended for service on Mobile Homes.

ML - Indicates a tire intended for Mining and Logging vehicles used in intermittent highway service.

NHS - Indicates a tire NOT intended for Highway Service.

SL - Indicates a tire with service limited to agricultural usage.

SS - Indicates a tire for off-highway vehicles such as mini and skid-steer loaders.

ST - Indicates a special tire for highway service trailers.

TG - Indicates an Off-the-Road tire for use on rims having bead seats with nominal +0.188" diameter (not for highway service).

TR - Indicates a tire for service on Trucks, Busses and other vehicles with rims having specified rim diameter of nominal plus 0.156" or plus 0.250".