Sram: Adopting all the technologies that provide the fastest, quietest shifting available, the new SRAM Force 22 Rear Derailleur has been designed with Exact Actuation technology for precise, efficient shifting throughout the extended gear range.SRAM have given an even refining tooth geometry of the jockey wheel. The result is that the chain runs smoother and quieter than ever before. With all the additional technologies we ve managed to keep the weight the same, at well under 200 grams.