This prevents the lower derailleur pulley from moving forward when bumps in the road cause g-force spikes that pull the chain downward". If you are unsure of the difference between the two systems, in Sram's words "the Orbit fluid damper consists of a silicone fluid damper with a one-way valve that controls the rear derailleur cage’s counter-clockwise rotation. One is that it uses a spring clutch for chain retention in the rear derailleur instead of the Orbit fluid damper the two higher-tier groupsets use. To keep costs down, there are a couple of features that Rival doesn't have compared to Force and Red. The entire groupset comes in at just over 3kg, which means Rival is a little on the weighty side and around a couple of hundred grams heavier than the nearest Shimano 105 Di2 competition.
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