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Calibre Bossnut Mountain Bike

Discount Card Price£1,200.00

Retail Price £1,500.00 Save 20%

​The multiple award-winning Calibre Bossnut is back, and it’s better than ever!

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Product code: 15903684 / 331527

​The multiple award-winning Calibre Bossnut is back, and it’s better than ever!

  • Full re-design
  • New frame tubes
  • New geometry
  • Fresh paint job
  • Massively upgraded specification

The Calibre brand is all about introducing people to Mountain Biking and ensuring they have a good experience whatever their budget. 

It's hardly surprising that the Calibre Bossnut is renowned as the best entry level full suspension bike on the market. When it comes to getting the best experience possible for the least amount of money, this bike cleans the floor with the competition.

The updated frame has a lower standover, longer reach, slacker angles and a full SRAM SX 12 speed groupset, perfect for ripping round trail centres or down technical descents.

**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. 

SRAM Level T brakes with 180mm front and 160mm rear rotors
SRAM SX Eagle – PG1210
SRAM SX Eagle Power Spline 32T
Rock Shox Recon RL 130mm - 42mm offset, Alloy tapered steerer
6061 Alloy, 130mm rear wheel travel, 142 x 12mm bolt through
Formula 15mm bolt through 32H (100mm x 15mm)
Calibre Trail 780mm width, 30mm rise – 31.8mm
FSA Orbit tapered No. 57E
Resin platform pedal (test pedals)
Formula 12mm bolt through (142mm x 12mm)
Rock Shox Monarch R M/L tune – 190mm x 51mm
Cycling, Everyday Use, Weekend
WTB ST i29 TCS 2.0 32H Tubeless ready
Calibre Trail 15mm offset – 30.9mm 350mm length
Calibre Trail 45mm
WTB Vigilante High Grip Comp 2.3" front and WTB Trail Boss Comp 2.25" rear
15.2kg (Large without pedals)

This product qualifies for the following delivery methods

Standard Delivery (3-5 days) (FREE)


Standard Delivery takes 3-5 days. You will receive updates from the courier once your order is dispatched.

Reserve and Collect (within an hour) (FREE)


Reserve your items to collect in store - usually within 1 hour! We will notify you when your order is ready to collect.

Click and Collect (3-5 days) (FREE)


Order online and have your items delivered to a store. Orders take 3-5 days to arrive, you will be notified when your order is ready to collect.

AM Delivery (£7.95)


Order by 8pm and get your item delivered to you by 12pm the next working day (Not available for NI, Channel Islands or Highlands)

Bike Delivery (£4.95)


Bike delivery is £4.95. This applies to all bikes, and these orders are upgraded to a DHL courier service.

British Forces Post Office (BFPO) (FREE)


Forces ONLY and cannot be used for civilian or business deliveries

Delivery before 10:30am (£8.95)


Order by 8pm and get your item delivered to you by 10:30am the next working day (Not available for NI, Channel Islands or Highlands) Excludes Bank Holidays.

Saturday Delivery (order by 6pm Friday) (£5.95)


Next Day Delivery (order by 6pm Mon - Fri) (£2.95)


Delivered by UK Mail. Remote areas may take longer, please click here for more info.

Click and Collect Next Day (order by 6pm Mon - Fri) (£2.95)



Returning orders to us is easy. Whatever your reason, we offer a refund or exchange within 28 days of delivery or collection.

Ratings & Reviews

Overall Rating

4.43 out of 5
14 reviews
Write a review
4.43 out of 5

Bossnut Calibre

Heavier than I expect, comfy compared to my hardtail. 27.5" wheels soften the blow of bumps tubeless are a pain. Only 11spd so not much top end. Great bike for the money. No problems aftr @1000mls

4.43 out of 5

Not great components

I bought this bike in January, I find it very heavy. So far I have ridden 108.2 miles and now the bottom bracket requires replacing and the brakes need a full service. This is not a good buy.

4.43 out of 5

Great Bike

Performs amazing both up and down hills. Tyres are grippy and seal up really well. Small annoyance with delivery back inner tube came with bent valve core and large puncture on the seam but had spare.

4.43 out of 5

Fantastic bike

Couldn't ask for more upgraded from the 2 cubed to this and its been a blast responsive quick and does everything I need with ease absolutely love it

4.43 out of 5

Fantastic bike that needs a bit of U.K. winter proofing

This is a great bike at a fantastic price but front tire is too big leaving very little (6mm) clearance and the tires themselves on tubeless rims are a nightmare when you puncture. Go tubeless asap

4.43 out of 5

Excellent bike for any money; unbeatable at this price

Superb bike, the frame is great and the componentry is decent too.

Would highly recommend.

Got mine delivered, packaged well and nice attention to detail with frame protectors supplied.

4.43 out of 5

Great bike, worth every penny!

Amazing bike, could not be happier with it. Lives up to all the expectations after reading countless reviews. I’m only a novice but this bike feels so responsive.

4.43 out of 5

So happy

Collected mine last week. very pleased from the off. Finally managed to get out today for the first time and all other reviews are spot on. Confidence inspiring and joyful. Even for a novice like me

4.43 out of 5

Lots of fun but gears not for me

After riding at hamsterly and dalby, the bike is great and easy to ride, but the two highest gears skip when under pressure, and I cant change from gear 1 into 2, took it on for a repair still the sam

4.43 out of 5

A hoot!

I just upgraded from a line 10 which was great. This is an incredible bike for the money. It’s like a magic carpet after having done Peak District trails on a hard tail. No regrets!! Thanks Calibre!

4.43 out of 5

Incredible machine for the money

I never expected this machine to climb or descend as efficiently as my old £3000 mtb which had fox full suspension, but hey it was better at both climbing and descending, I'm actually shocked.

4.43 out of 5


Went to Glentress at the weekend. been twice before on a hardtail and hung on for dear life. This bike glides, feels true, and smooth. I am no downhill expert but that was fun. This bike is awesome!!!

4.43 out of 5

Beyond expectation - wow is all I can say.

Been riding the bike for 4 weeks now, in a fair few different terrain types, Cheshire loam , Shropshire rock ridges - has not missed a single beat - its incredible for the money to be fair - Get ONE!!

4.43 out of 5

Good value for money

Well for start I have to say bike looks totally awesome well done for design

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