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The Boone requires the use of a seat mast cap to work with the rear IsoSpeed. Jolanda Neff's 2019 World Cup Waterloo Trek Boone. © Z. Schuster / Cyclocross Magazine

The Boone requires the use of a seat mast cap to work with the rear IsoSpeed. Jolanda Neff’s 2019 World Cup Waterloo Trek Boone. © Z. Schuster / Cyclocross Magazine