Calibre 2025 Bossnut Pro Full Suspension Mountain Bike

The name Bossnut needs no introduction in the mountain bike world. Originally launching almost a decade ago, the Calibre Bossnut redefined what an entry-level full-suspension bike could be, earning a reputation as our MTB of the Year. Now the 2025 Calibre Bossnut Pro takes things up a notch. Built to perform in almost any conditions, it's become a legend for its ride quality, handling and unbeatable value. Built on the same award-winning frame but with a tougher custom tubeset, improved cable routing and added bosses for tool storage, the Bossnut Pro is stronger, tougher, and ready for years of riding. Choice component upgrades make it the bike the Calibre team riders wanted, including a RockShox Psylo Gold fork, RockShox Deluxe Select+ rear shock, Shimano 4-pot hydraulic brakes, a 12-speed Shimano Deore drivetrain and Maxxis tubeless-ready tyres. With Boost hub spacing for extra stiffness and space for a bottle cage inside the frame, the Bossnut Pro is the complete package for riders moving up from a hardtail or chasing their next trail challenge. Size info XS - 5'5" (165cm) to 5'9" (175cm) S - 5'6" (168cm) to 5'10" (178cm) M - 5'8" (173cm) to 6' (183cm) L - 5'10" (178cm) to 6'2" (188cm) XL - 6'1" (185cm) to 6'6" (198cm) Spec details Frame: 29” 6061 Alu, boost spacing, 135mm rear travel, 73mm BSA BB Thru-axle: M12, pitch 1.5, length 174mm, thread length 20mm Forks: RockShox Psylo Gold, 29”, 140mm, stealth boost, 42mm offset Rear shock: RockShox Deluxe Select Plus, 210x55 Handlebar: 780mm wide, 20mm rise, 3deg upsweep, 6deg backsweep, bar bore 31.8mm Stem: 45mm extension, 31.8mm clamp Grips: Calibre ribbed lock-on grips Headset: FSA No. 57e tapered, ZS44 upper, ZS56 lower Saddle: Calibre trail Dropper post: X-Fusion Manic LC, XS&S:125mm, M:150mm, L&XL: 170mm Seatclamp: Alloy single bolt 34.9mm Chainset: Shimano Deore Pedals: Flat pedals BB: 73mm threaded BSA BB Chain: Shimano M6100, 118 links, 12 speed Cassette: Shimano, CSM6100, 12 speed, 10-51T Shifters: Shimano M6100-12 speed Rear derailleur: Shimano RD-M6100 Front Tyre: Maxxis 29”x2.5” Minion DHF 60Tpi Exo, tubeless ready Rear Tyre: Maxxis 29”x2.4” Dissector 60Tpi Exo, tubeless ready Rims: 30mm ID, can be set up tubeless Front hub: Shimano HB-TC500-15-B, 110mm, 32h Rear hub: Shimano FH-TC500-HM-B, 148mm, 32h Thru-axle: M12, pitch 1.5, length 172mm, thread length: 20mm Brakes: Shimano BL-M6100/BR-M6120 Front Rotor: Shimano SM-RT10, 180 Rear Rotor: Shimano SM-RT10, 180mm Please note: some minor specification changes may occur without notice. Any changes will use equivalent or higher quality parts. Building your bike: Bikes purchased online are delivered boxed and will require assembly before they can be used. View the GO Outdoors Bike Assembly guide for more info, including step-by-step and video instruction guides. We are happy to assemble your bike for FREE at any GO Outdoors store with a bike servicing department (this excludes all GO Express stores, and selected other GO locations). Please call ahead to confirm that you would like us to build your bike. You can find store details and phone numbers here. Every bike sold also comes with FREE 6 wee