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Calibre Bossnut Mountain Bike

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Retail Price £1,299.99

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Calibre's award-winning full-suspension mountain bike, available exclusively at GO Outdoors.

Just awarded MBR's Bike of the Year 2015, the Calibre Bossnut has been designed for both newcomers and experienced riders, with geometry that's tuned for confidence-inspiring stability and able to respond sharply to aggressive riding.

This full-suspension bike will help you conquer those rough, steeper terrains that a hardtail simply can't handle, giving you plenty of scope for future upgrading as your riding progresses.

It has a double-butted aluminium frame with a smooth-welded front triangle and a single pivot swing arm designed around 130mm travel platform, giving an ideal amount of suspension for all-round trail riding.

The RockShox Sektor Silver Solo Air fork and the Monarch R rear shock offer plush air-sprung suspension with rebound adjustment, the front fork being lockout-equipped for efficient pedaling when suspension isn't required. The rear shock maintains traction over rough ground, giving you greater control of your bike and letting you power through terrain that would previously have you grabbing your brakes.

The full Shimano Deore 2x10 groupset includes a clutch-equipped Shadow+ rear mech for improved chain retention, rugged enough to take serious trail abuse whilst still providing precise, efficient performance. The Shimano hydraulic disc brakes, and their integrated I-spec lever design, bolts together with the gear levers for a tidy, easy-to-use cockpit.

Deore hubs and tubeless-ready WTB ST i25 rims continue the upgrading theme, allowing you to make the move to tubeless tyres with a minimum of fuss. The WTB Vigilante sits on the front wheel to provide extra control and grip while cornering, while the Bee Line's lower tread keeps the rear wheel rolling fast.

Ritchey provide their famous high-quality aluminium components for the seatpost, stem and handlebars with their Trail Rizer bars right on trend for the modern trail rider at a 760mm width.

The Bossnut Ladies is also now available, designed with a women's specific size and components. Please click here for more information.

  • Already featured on MBR, MBUK and BikeRadar

Available in sizes 17, 19 and 21 (subject to stock availability) - Please check the info tab for geometry details


Wheel Size: 650B
Frame: 6061 aircraft grade hydroformed alloy frame with smooth welded front triangle, tapered headtube and 130mm rear travel
Fork: Rock Shox Sektor Silver 130mm travel with tapered alloy steerer and 15mm bolt through maxle
No. of Gears: 20
Gear Details: Shimano Deore 10 speed
Gear Shifters: Shimano Deore 2 x 10 speed iSpec
Front Derailleur: Shimano Deore 2 x 10 speed
Rear Derailleur: Shimano Deore 10 speed Shadow Plus
Chainset: Shimano Deore 38x26T
Cassette: Shimano Deore 11-36T
Chainrings: Shimano HG54 10 speed
Brakes - Type: Hydraulic Disc
Brakes - Details: Shimano M506 levers with M447 calipers, Shimano 180mm centre lock front rotor and Shimano 160mm centre lock
Brakes - Levers: Shimano M506 levers
Weight: 14.5kg
Rims: WTB ST i25 32H tubeless ready
Tyres: WTB Vigilante 2.3” front, WTB Bee Line 2.2” rear
Front Hub: Shimano Deore 15mm bolt through centre lock 32H
Rear Hub: Shimano Deore QR centre lock 32H
Stem: Ritchey 4 Axis (70mm for 17.5"and 19.5", 80mm for 21.5)
Saddle: WTB Volt Sport
Handlebar: Ritchey MTN Trail 750mm width, 20mm rise
Head Set: FSA Orbit tapered full sealed cartridge bearing
Pedals: Alloy platform pedal
Rear Shock: Rock shox Monarch RS 190x51mm
Seatpost: Ritchey 2 bolt 30.9mm, 350mm


Bossnut Geometry
17.5" 19.5" 21.5"
Seat Tube 445mm 495mm 546mm
Effective Top Tube  585mm 607mm 627mm
BB Drop 18mm 18mm 33mm
Rear Centre 436mm 436mm 436mm
Seat Angle 73.5° 73.5° 73.5°
Head Angle 67° 67° 67°
Head Tube Length 115mm 125mm 135mm

Reviews (54)

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  • 5 out of 5
Calibre Bossnut, 18 December 2016
By Dustytrail63 (so311ds)
What a bike!! My first full sus. before I splash some big (ger) cash. So no experience to compare against but have ridden ht's for a number of years and 'The Boss' completely changes the way I ride xc/singletrack. It inspires confidence with its planted feel, plush suspension and spot on gearing (although a 42t cassette ring would really make a difference). Brakes are more than capable to complete a great package. First outing at Swinley trail park recently, had an absolute hoot. No issues out of the box, up and running within an hour. Two additions - rockshox dropper and tubeless conversion using wtb rim tape, valves and Stan's fluid. Tyres seated no problem just a bit fiddly in using the sealant but well worth the conversion. One minor grumble, is its weight but at this price and performance that pales into insignificance. 'The Boss' does give the feeling of being bombproof!!

  • 5 out of 5
Awesome, 03 December 2016
By Trophycliipp
The bike is amazing, I ride the Purbecks with mates, who have much more expensive bikes and the Bossnut kicks ass.

Don't let the name put you off. A dropper post would be great, but the gears are crisp, shocks take most hits I throw at it and the geometry is pretty relaxed and comfortable.

I added new grips, pedals, Icetech 180 Rotors and Sintered pads...


  • 5 out of 5
Only one thing I'd change, 28 November 2016
By BrownBear
I'd gladly have paid a little extra for the tubeless ready version of the tyres, so that I could take advantage of the TR rims - which as usual are a pain to prise the bead off in case of puncture on trail

  • 5 out of 5
Everything that you have read about this bike is true!, 24 November 2016
By Timboz (Maidenhead)
What an amazing bike! I have had this bike for about 3 weeks now and have ridden it several times - and what a ride! I spent some time researching this bike online before deciding to purchase it. I have to agree with all the reviews and awards. I cant believe how well this bike climbs when you go for it, and once set up the suspension is very plush. The balance is superb and has a very stable feel to it.

Setting up was easy and setting the sag was straightforward. I am 5'10" and 11½ stone in weight and I am running 85 psi in the fork and 150 psi in the shock, with the rebound wide open on both. Tyres are at 35 psi, however I intend to go tubeless in the future. I will also add a dropper post!

Issues. Out of the box the front derailleur needed adjustment and I will need to bleed the rear brake. Also, as other reviewers have mentioned, please keep an eye on the pivot bolts as they can work lose. One of the pivot bolts has been rounded and I need to talk to Go Outdoors about this to get a spare. If you are not a confident mechanic I would suggest paying someone to put it together for you.

So if you are after a great full suspension mountain bike at a killer price and are not a badge snob then go for it!!

  • 4 out of 5
Great bike just needs setting up correctly, 21 November 2016
By adley (Essex)
Getting back into mountain biking after around 15 years out and needed something robust to build my confidence on before splashing out a fortune. This bike has exceeded my expectations.On its 3rd outing I was hitting blacks at Bike Park Wales and spent a day pedalling squares up Afan. The bike is solid, stable and really takes care of you when hitting big boulders. The only reason I have given it 4 stars is because the rear shock got stuck closed and refused to be pumped up. I had to remove it and open it to release the pressure. When put back together normal behaviour resumed. The rear tyre is useless for anything but dry conditions and the brakes/gears needed adjusting out of the box. I think GO Outdoors could have spent a little more time on the setup before shipping. All in great value for money and I had no problem keeping up with the 6k santa cruzs. Worth noting, I swapped the standard pedals for something more sturdy and added a dropper saddle, swapped the rear tyre for something with more meat. Also if you are thinking of hitting bigger stuff its worth going tubeless or pro core as I punctured 4 times in 2 days.

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