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._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, 73mm BSA BBThru-axle: M12, pitch 1.5, length 174mm, thread length 20mmForks: RockShox Psylo Gold, 29”, 140mm, stealth boost, 42mm offsetRear shock: RockShox Deluxe Select Plus, 210x55Handlebar: 780mm wide, 20mm rise, 3deg upsweep, 6deg backsweep, bar bore 31.8mmStem: 45mm extension, 31.8mm clampGrips: Calibre ribbed lock-on gripsHeadset: FSA No. 57e tapered, ZS44 upper, ZS56 lowerSaddle: Calibre trailDropper post: X-Fusion Manic LC, XS&S:125mm, M:150mm, L&XL: 170mmSeatclamp: Alloy single bolt 34.9mmChainset: Shimano DeorePedals: Flat pedalsBB: 73mm threaded BSA BBChain: Shimano M6100, 118 links, 12 speedCassette: Shimano, CSM6100, 12 speed, 10-51TShifters: Shimano M6100-12 speedRear derailleur: Shimano RD-M6100Front Tyre: Maxxis 29”x2.5” Minion DHF 60Tpi Exo, tubeless readyRear Tyre: Maxxis 29”x2.4” Dissector 60Tpi Exo, tubeless readyRims: 30mm ID, can be set up tubelessFront hub: Shimano HB-TC500-15-B, 110mm, 32hRear hub: Shimano FH-TC500-HM-B, 148mm, 32hThru-axle: M12, pitch 1.5, length 172mm, thread length: 20mmBrakes: Shimano BL-M6100/BR-M6120Front Rotor: Shimano SM-RT10, 180Rear 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 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