Called Vistar // Powershift, the group pairs a wireless derailleur and 12-speed cassette with Classified's two-speed internally geared hubs, achieving a wider range of unique gears - up to 530% range with an 11-40 cassette.
With QuantumShift turned on, you can simply shift up or down and it will automatically shift the derailleur or the hub (or both) to give you the smallest gear step possible in either direction. This effectively gives you 15 to 16 individual gears.
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