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The Calibre Bossnut has won countless awards since it first hit the scene back in 2015 and became the benchmark for all entry level full-sus mountain bikes.If you wanted to get into mountain biking and didn't have a huge budget then the Bossnut was the bike to buy, and it quickly became the go-to for new riders or people getting back into the sport. This perfectly summed up Calibre's ethos of producing bikes that provide affordable performance.The original Bossnut went through 5 iterations and continued to grow in popularity until 2020 when all production ceased during the pandemic. It's been over 4 years since the last model launched; 4 years of redevelopment, testing, prototyping and refining to create the best entry level performance mountain bike on the market.Back better than ever the 2025 Calibre Bossnut is built around a brand new frame designed from the ground up with progressive geometry that's amazing out of the box, as well as worthy of upgrades to stand the test of time. Stacked with quality components that make it more capable than ever and with the same easygoing feel that it's always been loved for._Available online and in the following GO Outdoors stores while stocks last: Basingstoke, Berwick, Blackburn, Bury, Canterbury, Cardiff, Chester, Chesterfield, Clydebank, Coatbridge, Derby, Doncaster, Edinburgh, Erdington, Gateshead, Harlow, Hull, Inverness, Ipswich, Kidderminster, Liverpool, Loughborough, Milton Keynes, Norwich, Nottingham, Penrith, Peterborough, Plymouth, Pudsey, Shrewsbury, Stockport, Stoke, Sunderland, Swansea, Swindon, Taunton, Thurrock, Wakefield, Wigan, Wolverhampton, Coventry, Stockton and York._Size infoXS - 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)_• Frame: 29” 6061 Alu, boost spacing, 135mm rear travel, tool and bottle bosses• Forks: RockShox Recon Silver RL, 29”, 140mm, stealth boost, 42mm offset• Rear shock: RockShox Deluxe Select R, 210x55• Handlebar: 780mm, 31.8mm, 20mm rise• Stem: 45mm, 31.8mm clamp• Grips: Calibre 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: 34.9mm• Chainset: Shimano Cues 32T, 170mm cranks• Pedals: Flat pedals• BB: 73mm threaded BSA BB• Chain: Shimano Linkglide, LG500• Cassette: Shimano, 10 speed, 11-48T• Shifters: Shimano Cues• Rear derailleur: Shimano Cues• Front Tyre: Maxxis 29” x 2.5” Minion DHF 60Tpi Exo• Rear Tyre: Maxxis 29” x 2.4” Forekaster 60Tpi Exo• Rims: 30mm ID, tubeless ready• Front hub: Shimano, 110mm, 32h• Rear hub: Shimano, 148mm, 32h• Thru-axle: M12, pitch 1.5, length 172mm, thread length: 20mm• Brakes: Shimano MT401• Rotors: Shimano 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 bikeYou can find store details and phone numbers here. Every bike sold also comes with FREE 6 week safety check_Can't get to a GO store? Our partners at LeisureLakes bikes will also assemble and inspect any new bikes purchased from our website. You can book a LeisureLakes appointment here_Warranty and Returns info: Unfortunately, we are not able to process faulty or warranty bike returns through our warehouse. If your bike develops a fault please contact your nearest GO Outdoors store with a bike servicing department where they will be able to help you. Please call to discuss and book an appointment before you go to store. You can find store details and phone numbers here