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Fits Lockheed LD20 calipers as commonly used on Formula Ford, Formula Continental, and FF2000. All ICP-20 and Wilwood WLD-20 lightweight brake calipers use this pad size. Also fits Brembo 20.3655.0 and AP CP2561 (1977-85 Formula 1) calipers, though it is slightly thinner than the 16.8mm thick CP2554 pad. AP pad shape CP2399. FMSI D005.
RS44 All-around racing compound with medium friction and medium bite. Excellent for most Club Racing, from small formula cars up to lighter sedans and production cars. Friction rises smoothly and gradually with temperature; coupled with excellent release characteristics, this is an easy-to-use and forgiving pad. Great choice on the rear axle of front-wheel-drive cars. Effective 300°C to 750°C (572°F to 1380°F), optimum 500°C to 700°C (930°F to 1300°F).
RSH42 This compound was developed for Vintage and Historic racing. The low-to-medium friction level works well in small formula cars or as a rear axle pad in front-wheel-drive cars (paired with RSH29E on the front). Excellent low-temperature effectiveness, with virtually no change in friction from dead cold all the way up to 350°C and a low but very wide torque peak. Effective from dead cold to 750°C (1380°F), optimum 500°C to 670°C (930°F to 1250°F) -- but the peak is very low compared to the baseline, with the entire Mu curve between about 0.40 and 0.45!
RSL2 Endurance racing compound with medium-high friction and bite. This compound has been tuned for excellent pad and rotor wear in GT, Touring, and Prototype endurance racing, but the superior release makes it at home in sprint races. Friction remains stable across a wide range of high temperatures. Effective 250°C to 750°C (480°F to 1380°F), optimum 350°C to 700°C (660°F to 1300°F).
RSL29 Endurance racing compound with medium friction and bite. This compound has been tuned for excellent pad and rotor wear in GT, Touring, and Prototype endurance racing, but the superior release makes it at home in sprint races. RSL29 is also a great choice for track day cars seeing long track sessions. Effective 200°C to 700°C (400°F to 1300°F), optimum 400°C to 650°C (750°F to 1200°F).
RST2 Sprint and stock car racing compound with medium friction and medium-high bite. Friction rises predictably and smoothly with temperature. Recommended for GT and Touring cars running high brake temperatures. RST2 can also be used in rallying on pavement. Effective from 250°C to 750°C (480°F to 1380°F), optimum 350°C to 550°C (660°F to 1000°F).
RST4 Sprint and stock car racing compound with medium friction and medium-high bite -- and a torque curve that's more like a straight line! Recommended for formula cars, Rally, and NASCAR long ovals. Temperature rises slightly to the peak, then holds absolutely steady all the way up to 750°C with no drop-off. Effective from 150°C to 750°C (300°F to 1380°F), optimum 300°C to 750°C (660°F to 1380°F).
