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Nys ran the Ultegra RX805 Di2 clutch-based derailleur with an 11-28t cassette. The Checkpoint comes stock with an 11-34t. Sven Nys' 2018 Dirty Kanza 200 Trek Checkpoint. © Z. Schuster / Cyclocross Magazine

Nys ran the Ultegra RX805 Di2 clutch-based derailleur with an 11-28t cassette. The Checkpoint comes stock with an 11-34t. Sven Nys’ 2018 Dirty Kanza 200 Trek Checkpoint. © Z. Schuster / Cyclocross Magazine