Michelin TRX | TRX Tires These tires have remarkable grip thanks to the ideal distribution of pressure in the contact patch, and excellent comfort due to increased useful flexing zone. TRX tires are built in the authentic molds and are available in many sizes for European and US autos. Quantities are limited and current stock on hand may be available, but future production is not guaranteed. The invention of the TRX tires by Michelin in 1975 permitted a more even distribution of tension in the whole tire casing, which is where the name of TR standing for “Tension Repartie” ("distributed tension") comes from. The Michelin TRX won renown in Formula 1 racing with Renault and Prost and in the world rally championship on the Audi Quattro, 205 Turbo 16 and R5 Turbo. For the first time, the tire and its rim complemented one another perfectly, working as a single unit. The rim underwent a fundamental transformation, the essential characteristic of which was a flatter, lower flange. This new design of the rim and tire bead resulted in a gradual curvature of the casing, without the "S" shaped flexing inherent in traditional designs. Thanks to this innovative construction, the TRX tire offers better directional stability and makes a great contribution to the active safety of the vehicle, thanks to its exceptional handling close to the limit, especially when cornering. The seventies saw the dawn of increased awareness of the importance of vehicle safety. In many countries it became compulsory to wear seat belts and speed limits were introduced on main roads and motorways. For the tire, this led to improvements in grip, more precise steering, increased stability and better levels of comfort, reducing excessive driver fatigue on longer journeys. This decade also witnessed the advent of high performance vehicles capable of covering hundreds of miles in one trip, with exceptional levels of safety and comfort, such as the BMW 7 series (1977), 5 and 3 series which followed the same trend, CX 2400 GTI (1977), 604 (1975), R30. Sports cars also benefited from this progress. Examples were the Ferrari 308 GTS and GTB (1977) and 512 BB (1976), Alpine A310 V6 (1976), Renault 5 Turbo (1979), M 635 (1984), 205 Turbo16 (1985). All theses cars (and many others) had the Michelin TRX fitted as original equipment, and still can today, with a tire true to that era, but manufactured using today’s techniques and materials.