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.
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.
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.
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
||6061 aircraft grade hydroformed alloy frame with smooth welded front triangle, tapered headtube and 130mm rear travel
||Rock Shox Sektor Silver 130mm travel with tapered alloy steerer and 15mm bolt through maxle
|No. of Gears:
||Shimano Deore 10 speed
||Shimano Deore 2 x 10 speed iSpec
||Shimano Deore 2 x 10 speed
||Shimano Deore 10 speed Shadow Plus
||Shimano Deore 38x26T
||Shimano Deore 11-36T
||Shimano HG54 10 speed
|Brakes - Type:
|Brakes - Details:
||Shimano M506 levers with M447 calipers, Shimano 180mm centre lock front rotor and Shimano 160mm centre lock
|Brakes - Levers:
||Shimano M506 levers
||WTB ST i25 32H tubeless ready
||WTB Vigilante 2.3” front, WTB Bee Line 2.2” rear
||Shimano Deore 15mm bolt through centre lock 32H
||Shimano Deore QR centre lock 32H
||Ritchey 4 Axis (70mm for 17.5"and 19.5", 80mm for 21.5)
||WTB Volt Sport
||Ritchey MTN Trail 750mm width, 20mm rise
||FSA Orbit tapered full sealed cartridge bearing
||Alloy platform pedal
||Rock shox Monarch RS 190x51mm
||Ritchey 2 bolt 30.9mm, 350mm
Add A Review
Long term review, 17 April 2017
By tc (Surrey Hills)
I've owned this bike since December 2015. At 5'11 I went for the 19inch frame. The size is spot on. I immediately installed a dropper post and converted the tyres to tubeless. The tubeless conversion was a little tricky as other have mentioned but I haven't looked back since. The bike is well balanced and perfect for the surrey hills area. Last year I discovered a little play in the rear suspension - this was quickly resolved with a trip to the Lakeside store. Apparently it was a known issue with early bikes. Towards the end of last summer I converted the bike to a single chain ring setup. Although it's fairly heavy it's still possible to spin up everything. It also became my go to bike - my full sus 29er which cost almost double the initial outlay of the bossnut gathered dust and eventually was sold to fund a new hardtail. I've very recently replaced the bars (as suggested in the recent Dirt100 review) with something longer than the stock 750mm - it's even better. Looking forward to doing many more miles this Spring/Summer.
Bossnut Problems, 11 April 2017
By john (Manchester)
This is my first full suspension bike and i have ridden it 4 times at Clayton Vale in Manchester. Whilst it lasted it was great fun and having never ridden a full sus, I can see what a difference it makes downhill. Unfortunately on the last ride the rear shock collapsed and a pivot sheared. It's all repairable apparently and under warranty, but might take a while, as shock has to go back to rockshox. I am supposed to be taking it to Wales for some serious downhill action, however I am now very worried that it is not up to it. I also changed the tyre as there was no grip on the Beeline. The new tyre now touches the seat tube when suspension fully compressed and has worn the paint off. I am by no means a crazy rider, bike has had some moderate hits but this does not fill me with confidence.
Bossnut Great-price just good, 09 April 2017
By JW (USA)
The Bossnut bike itself is an excellent mountain bike especially for newbies into full-suspension. Great components and design at an excellent price-unless you're shipping to the US. Go Outdoors doesn't include in the price a more than 15% shipping and duties price before you get it. Takes the bike from being a fantastic deal to just a good one.
Amazing bike, 05 April 2017
By Hunty (Lincoln)
Bought the bossnut last June. It has been with me to cannock, dalby, sherwood pines, viking challenge and recently the peak District. He bike has not let me down once . Look after it and it'll look after you. I've changed the pedals not through malfunction just liked the nukeproofs better. Great bike that handles everything and more you throw at it.
Caliber Bossnut, 14 March 2017
By bjellys (Torquay)
Fantastic bike it is as good as all the reviews say. I fitted a dropper post and different pedals, it feels so solid in all conditions so 10/10 from me.
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