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@joel_austen
More to the point it stops you dropping a chain. There is no need for a chain tensioner because the chain length is constant, while having a raised suspension pivot point.
14 gears is too many for a DH bike really, so they now build one with G-Boxx 2, which only has 7 speeds. This is far simper housing 14 different size sprockets and 7 mini chain runs, all internal.