Often called RPP or R-type belts, these single-sided timing belts have parabolic teeth that feature a curved shape with an indentation in the center of each tooth. This shape ensures the load is distributed evenly as the tooth meshes with the grooves on the pulley, which reduces stress on the belt. Parabolic-tooth timing belts are often used to drive cam shafts and crank shafts in automobiles.
These belts can be installed on round-tooth pulleys or parabolic-tooth pulleys with HTD, RPP, GT, and GT2 sprockets. When replacing a timing belt on a pulley, make sure the pitch and width of the belt are compatible with the pulley. In general, timing belts with higher pitches provide more strength for demanding applications.