The Box Four tier is built for riders who want simplicity with solid performance. If you like the idea of Prime 9 but don’t need all nine gears, this 8-speed setup delivers plenty of range with a 12–42T cassette. The derailleur still features the Limited Slip clutch, now paired with a more compact cage. A tough custom 8-speed chain and dedicated wide-narrow chainring handle serious use, while the straightforward shifter keeps things simple with one downshift per lever swing.