the internal combustion engine drives two clutch packs. the outer clutch pack drives gears 1, 3, 5 (and 7 when fitted), and reverse – the outer clutch pack has a larger diameter compared to the inner clutch, and can therefore handle greater torque loadings. the inner clutch pack drives gears 2, 4, and 6. instead of a standard large dry single-plate clutch, each clutch pack for the six-speed dsg is a collection of four small wet interleaved clutch plates (similar to a motorcycle wet multi-plate clutch). due to space constraints, the two clutch assemblies are concentric, and the shafts within the gearbox are hollow and also concentric. because the alternate clutch pack's gear-sets can be pre-selected (predictive shifts enabled via the unloaded section of the gearbox), un-powered time while shifting is avoided because the transmission of torque is simply switched from one clutch-pack to the other. while the dsg has one of the fastest shift times on the market, the claim that the dsg takes only about 8 milliseconds to upshift is un-proven with 3-party data nor claimed by the manufacturer.