Suntour xce rear derailleur6/7/2023 This provided a sharper outside corner of each tooth for better chain pickup, and the slant helped the chain slide down sideways into good engagement if it was tending to run along the tops of the teeth. The tops of the teeth were not squared flat or grooved, as with older designs, but were asymmetrical, with a slant inward. Sun Tour freewheels provided much better shifting than older designs due to the superior design of the sprocket teeth. ![]() In the early '70s, Sun Tour freewheels were a revolutionary development, markedly superior to their European competition (Atom, Cyclo, Everest, Regina etc.)
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