The Michelin TRX is a radial tire introduced by the Michelin Group in 1975. Its introduction as the first "low profile" tire marked an advance in tire technology.
Tension was more evenly distributed in TRX tires, affording better directional stability and more precise steering, as compared to contemporary tires.
TRX tires require the use of wheels that were specially mated to the tires; standard tires do not fit TRX wheels.
TRX tires were available either as standard or optional equipment on certain models of European makes such as BMW, Audi, Mercedes-Benz, Citroen, Peugeot, Ford, Ferrari, Alfa Romeo, Renault, and SAAB. They were also available on certain models of the Mercury Capri during the 1980s.
In due course tire technology caught up with the TRX line, and TRX tires are now produced only as special-order replacements for vehicles which were originally fitted with them.
In the U.S. they are commonly associated with Ford Mustangs, and have gained a lot of respect from the Mustang community.