Calibre releases Triple B — upgraded more aggressive version of Bossnut

Wildly popular limited edition Beastnut replaced with permanent addition to range

Calibre has today officially released the 27.5-inch wheel Triple B, a more aggressive and upgraded version of its wildly popular Bossnut.  


The bike is actually an evolution of the Beastnut, a short run of limited-edition higher-spec versions of the Bossnut that sold out very quickly when they were released in January of last year. The Triple B is the permanent replacement of that crowd favorite.

Calibre Triple B spec

  • Frame: Alloy frame, 130mm rear travel, stealth and external dropper routing. 142 x 12mm bolt through rear axle
  • Rear shock: RockShox Monarch R 190x51mm
  • Fork: RockShox Reba RL, 140mm
  • Drivetrain: SRAM NX 1×11 speed
  • Cassette: SRAM PG1130 11-42
  • Chainset: Samox trail with 32t narrow wide ring
  • Brakes: SRAM Guide T
  • Rims: WTB ST i29 32H tubeless ready
  • Tyres: WTB Vigilante 27.5 x 2.3in front and WTB Trail Boss 2.25in rear
  • Front hub: Formula 15mm bolt through 32H
  • Rear hub: Shimano MT500 142mm
  • Stem: Calibre trail 45mm
  • Saddle: Calibre Triple B
  • Handlebar: Kore Durox 780mm width 20mm rise
  • Headset: FSA Orbit tapered No. 57E
  • Pedals: Alloy platform pedal
  • Weight: 14.5kg

Calibre Triple B highlights

The bike looks properly sorted for the money
Go Outdoors

Compared to the V2 version of the Bossnut, which costs £999 (£1,300 without the discount card), you can buy the Triple B for £400 more at £1,399 (£1,600 without the discount card), with some substantial upgrades.

Starting from the back, the rear triangle gains a thru-axle, and up front, a higher spec 140mm travel RockShox Reba RL fork replaces the 130mm Sektor used on the Bossnut.

The 2x Deore groupset has been swapped out in favour of a 1×11 SRAM NX. A Tranz-X dropper post and a set of SRAM Guide brakes have also been fitted.

The wheels also see an upgrade, moving to WTB’s slightly wider i29 rims, giving the WTB Trail Boss/Vigilante tyres a better profile.

We take a closer look at the Bossnut V2 on our YouTube channel

While Go Outdoors is a UK-based retailer, it’s worth bearing in mind that the outdoor mega-retailer offers world wide shipping. 

It’s no secret that we’re big fans of the Calibre Bossnut — Go Outdoors has done a stellar job putting together a properly sorted, inflation-dodging bike and we’re really looking forward to trying out the Triple B, which on the surface at least, seems to feature many of the upgrades we would recommend making to the Bossnut.

The bike comes in at £1,399 (with discount card, £1,600 without) and can be preordered now at Go Outdoors.