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The multiple award-winning Calibre Bossnut is back, and its better than ever! It features a full re-design, with new tubes, geometry and a massively upgraded spec. This is an introduction to mountain biking that will have you hooked from your first downhill.

Product code: 331527

Key Features

  • Frame: 6061 Alloy, 130mm rear wheel travel, 142 x 12mm bolt through
  • Forks: Rock Shox Recon RL 130mm - 42mm offset, Alloy tapered steerer
  • Chainset: SRAM SX Eagle Power Spline 32T
  • Front derailleur: SRAM SX Eagle
  • Rear derailleur: SRAM SX Eagle
  • Cassette: SRAM SX Eagle – PG1210
  • Brakes: SRAM Level T brakes with 180mm front and 160mm rear rotors
  • Shifters: SRAM SX Eagle
  • Rims: WTB ST i25 32H tubeless ready
  • Tyres: WTB Vigilante High Grip Comp 2.3" front and WTB Trail Boss Comp 2.25" rear
  • Stem: Calibre Trail 45mm
  • Bars: Calibre Trail 15mm offset – 30.9mm 350mm length
  • Headset: FSA Orbit tapered No. 57E
  • Seatpost: Calibre trail 30.9mm 350mm length
  • Saddle: WTB Volt Sport
  • Pedals: Platform resin test pedals
  • Colour: red
  • Small - 5'2" - 5'6" / Medium 5'5" - 5'10" / Large - 5'10" - 6'1" / XL 6' - 6'6"

**Some minor assembly is required. See our video (below the image) or consult our assembly guide for assistance.

Unfortunately we are not able to process faulty or warranty bike returns through our warehouse.  If your bike develops a fault please take it to your nearest GO Outdoors store where we have a full workshop and trained mechanics who will be able to assist you. 

Please note, this excludes Hathersage and Southport stores.


Mountain Bikes


Overall Rating

5.0 stars 5.0 / 5 (based on 2 Reviews)
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5 out of 5

Brilliant value with great spec

I bought this as an upgrade after realising the Forest of Dean is too much for a Specialized Hardtail.
The difference this bike makes is brilliant. Adjustable front and rear shockers, gear change in on side, great WTB tyre and wheels, effective brakes and a really cool designed frame.
If you love mountain biking but don't want to spend a fortune, this bike is brilliant.

5 out of 5

Great value bike, good quality and design/spec


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The Blacks Label signifies a tried and tested product that will not be beaten on price. It represents the pinnacle of performance and the greatest value. The Blacks Label range embodies the foundations of Blacks itself; the best gear, for the best value that is purpose built to get you out there. As a result, all 'Blacks Label' products are excluded from any promotional offer we may run on the website.