ウェブ2000 Mongoose NX 7.1 Mountain Bike Catalogue. NX 7.1. RIDER STYLE. NX SERIES. The 2000 Mongoose NX 7.1 features next-generation Mongoose Newman with butted downtube, forged dropouts and. Tapered seat/chainstays, replaceable derailleur hanger. Manitou Magnum front suspension. 27-speed Shimano Deore drivetrain.