SRAM DERAILLEURS - REAR
SRAM X9 Type 2 Rear Derailleur
- Item: SRM0412 Actual Weight:"Actual Weight" means we weighed this item ourselves. 248 g
You're rolling over boulders like a tank. You line up to take on a sketchy steep climb, give it a burst of power, and then realize your chain isn't connected to the drivetrain anymore. You lurch to an abrupt stop, boil over into a rage, and consider the merits of hucking your bike, riderless, down the hillside into oblivion. The SRAM X9 Type 2 Rear Derailleur helps prevent dropped chains and limits chain slap by incorporating a clutch mechanism that controls chain tension and stabilizes the rear derailleur cage.
Shimano's Shadow Plus design, which is engineered to produce a similar chain-stabilizing effect, preceded SRAM's Type 2 design in reaching the marketplace. However, Type 2 technology differs from its competition in a key way. Rather than opting for an adjustable friction band, SRAM put a Roller Bearing Clutch in their Type 2 derailleurs. The clutch comes pre-set from the factory to provide a certain amount of friction inside the derailleur cage pivot. This friction keeps the cage from bouncing up and down over rocky trails and de-tensioning the chain. Because it's pre-set at the factory, SRAM's Type 2 clutch can't be disengaged or adjusted like Shimano's Shadow Plus mechanism. That being said, the Type 2 clutch is self-lubricating, and there are no external moving parts, so unlike the Shadow Plus system, it's designed to be maintenance-free. The Type 2 mechanism adds about 30 grams to the weight of a standard X9 rear derailleur.
A unique feature of the Type 2 system is that its Cage Lock technology allows you, with the push of a button, to lock the derailleur cage in an extended position. While it may not be a game changer, this is a nice feature that allows for easier-than-ever rear wheel installation. There's no need to worry if you accidentally leave the derailleur cage locked; it will return to normal operating position when you hit your first bump. Another benefit of the Cage Lock is that it makes chain installation a bit easier; you don't have to maintain a consistent pulling force on the cage while joining the two chain ends.
SRAM's Exact Actuation Technology facilitates consistent shifting through all gears, including 36-tooth rear cogs. The X9 Type 2 is a tad heavier than the stepped-up X0 Type 2, but it'll leave you some cash for dog food. The X9 Type 2 uses sealed bushings in the pulleys and has an alloy cage. The SRAM X9 Type 2 Rear Derailleur comes in Black/grey and in 3 cage lengths: Short, Medium, and Long. SRAM suggests the short cage for downhill use, Medium cage for 2 x 10 use, and Long cage for 3 x 10 use.