Mongoose went 1x on the Guide Expert for 2019 with a SRAM Rival 1 rear derailleur. Mongoose Guide Expert Adventure / Touring Bike. 2018 Sea Otter Classic. © Cyclocross Magazine

Mongoose went 1x on the Guide Expert for 2019 with a SRAM Rival 1 rear derailleur. Mongoose Guide Expert Adventure / Touring Bike. 2018 Sea Otter Classic. © Cyclocross Magazine undefined