The low cost, high quality replacement changer for your bike. It has, however a number of features that the more expensive ones have. Like the Dura-Ace rear, there are adjustments for return spring tension, B-Tension adjustment, high and low gear adjustments, and a convenience adjuster for cable slack. Installation and cable fastening are done like the DA rear, with a 5mm allen wrench. The body is made of aluminum and steel, while the pulley cage and bolts are made of steel.
The pulley cages are made of plastic with a polished steel bushing to revolve on, while thin steel caps keep dirt out of the whole mechanism. The cage is fashioned to prevent spoke damage in an overshift. The RX100 weighs 279 grams. The maximum rear sprocket for this derailleur is 28 teeth, while the minimum is 12 teeth. The greatest difference in size between the two front chainwheels can't exceed 13 teeth and the Total Capacity for this derailleur is 28 teeth. Right between the DA and the Ultegra.
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