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Out of stock - Calibre BOSSNUT EVO


Out of stock

Evolution can take a long time, thankfully the Calibre team are quick to act - let the fun begin!

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Product code: 15903687 / 325099

Evolution can take a long time, thankfully the Calibre team are quick to act - let the fun begin!

Lots of small changes have come together to make one big change and produce a new class killer, the Calibre Bossnut Evo.

Having listened to the many magazine reviews, team riders, and customers, Calibre have updated their Bossnut V2 with a view to making the best even better.

The frame stays with its superb geometry but now features both internal and external stealth dropper post routing, letting you choose whichever suits your style.

Rock Shox Recon RL forks are now fitted, still with 130mm travel and 15mm bolt through, but they are stiffer than the previous forks and give greater control in changes of direction and tracking your lines.

A 1x11 SRAM NX drive chain provides simplicity for the rider, yet still gives a huge range of gear ratios to clear any climb. Like everything in life, what’s better than 10? That’s right, turn it up to 11!

Each Bossnut has proven to be a fast bike, so powerful and responsive braking is now even more important. Covering this, the Evo has been fitted with Shimano MT500 brakes – a proven stopper.

Handlebars are a personal choice but several reviews sited the originals as needing to change, so it now comes fitted with a Kore Durox 780mm bar with 5 degree up and 8.5 degree back sweep.

The WTB ST rims now have an increased internal width of 29mm, giving greater strength but also a much better tyre profile which also offers more compliance. 

Giving much more grip that lets you ride faster and harder, the Vigilante front tyre is now paired with the WTB Trail Boss tyre, making the Bossnut Evo even more of a trail weapon.

  • Available in S, M, L and XL. Please see the info tab for geometry details
Bossnut Evo Geometry  
 15.5" (SM) 17.5" (M)
19.5" (L) 21.5" (XL)
Seat Tube  395mm 445mm 495mm 546mm
Effective Top Tube   580mm 601mm 622mm 640mm
BB Drop  18mm 18mm 18mm 33mm
Rear Centre  436mm 436mm 436mm 436mm
Seat Angle 73.5° 73.5° 73.5° 73.5°
Head Angle 66.8° 66.8° 66.8° 66.8°
Head Tube Length  110mm 115mm 125mm 135mm
Reach  411mm 429mm 446mm 463mm
Shimano MT500 with Shimano 180mm front and 160mm rear rotors (Resin pads only)
Hydraulic Disc
SRAM PG1130 11-42
Samox trail with 32T narrow wide ring
Rock Shox Recon RL 130mm travel with tapered alloy steerer and 15mm bolt through maxle stealth
6061 aircraft grade hydroformed alloy frame with tapered headtube and forged one piece rocker link - 130mm rear travel. Stealth and external dropper routing.
Formula 15mm bolt through 32H
SRAM NX 1x11
Kore Durox 780mm width 20mm rise
FSA Orbit tapered No. 57E
Alloy platform pedal
SRAM NX 1 x 11 speed
Shimano TX505 32H QR
Rock shox Monarch R 190x51mm
Cycling, Weekend
WTB ST i29 32H tubeless ready
WTB Volt Sport
Calibre trail 30.9mm 350mm length
Calibre Trail 45mm
WTB Vigilante 2.3" front and WTB Trail Boss 2.25" rear

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Ratings & Reviews

Overall Rating

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

small size frame- dropper post beware !

on small frame seatpost can only insert frame about 170mm ,be aware a dropper post will therefore stick out frame quite far ,my wife is 5' 4" tall using a rs reverb 125mm/390 ,a bit high for descents

4.43 out of 5

Love this bike

Went to Go tested it and it fits like a glove. Handles really well for my level of riding. Had no issues with it for PST few months all good

4.43 out of 5

Brilliant to ride, when it's not broken!

Title says it all. Owned for 15 months now and have had such a lot of bother, Some of the parts they hang off this thing are garbage. Not helped by the assembly and aftercare. Factor in extra costs.

4.43 out of 5

Great value and service

I an older version of the bike and I've been very happy with it. For the issues I've had both gooutdoors and calibre bikes themselves have been very helpful.

4.43 out of 5

Great bike only 1 issue

It was the last one and was on display. All in all fantastic bit of kit but had the crank bolt missing, this can be replaced with FSA M18 bolts as the original is hard to obtain due to being Chinese.

4.43 out of 5


I had been looking for good off road bike and with £1k budget, was looking mainly high end 29ers (Cube/Whyte) as most reliable full sus are £1.5k upwards, then I found this top sec just not a big name

4.43 out of 5

Best bike you can get for less grand

Best bike can get for less than grand yes needs some tweaks but couple upgrades and bike is good as 3 grand bike I ride with bossnut riders group and we all love the bike

4.43 out of 5

Bossnut EVO ‘the best bike under £1k’

My review is pretty simple.

This is the best bike under £1k, fact!

If you don’t buy one, then you are more silly than Donald Trumps hair.

A fantastic bike for the money. #ridecalibre

4.43 out of 5

Great bike but needs a bit of tweaking

4.43 out of 5

Good Bike, Poorly Built - cables and derailleur

Good bike and fun to go out on trails with, but came built not 100 percent properly causing my derailleur to break and leave me having to buy a new one.

4.43 out of 5

Service poor - good bike.

Bike is good, just had problems with de-railer and took to another branch to fix, still no good. Took it to Halfords who praised bile - just said had been put together poorly as cables ran poorly.

4.43 out of 5

Overall great bike. Infuriating tubeless rims

This is a brilliant value bike. Great spec and a joy to ride. The first time you come to repair a puncture, however, you will wish you'd never been born. The tubeless tyres are _impossible_ to remove. Sure there may be a knack to it, but I can't do it and the two mates I'd been out with couldn't do it. Budget for replacing the wheels if you want to spare yourself a _lot_ of pain and frustration. On a plus note, shorty after buying it, it developed a creak, which I couldn't track down. Took it back to GO Leeds and they took the thing apart, greased everything and put it back together. Great service! Apparently there wasn't enough grease in the rear bushings. So, ace bike, brilliant geometry and cracking spec but those rims will have you howling for blood.

4.43 out of 5

Great value bike

Brought this for my nephew about 2 months ago to replace the naff carrera I got him last year and he loves it, I set shocks up for his weight double checked everything (perfect already) and took him chicksands where he absolutely left me for dust on slalom and 4x, this bike has given him no end of confidence, his doing stuff I didn't think he'd do and he gets some decent air too, plus its also been trouble free. Brakes are much better than mine too. I've Just got to get him a dropper post. Wish I'd got one of these myself instead of spending £££ on replacing both broken shocks on my old reign.. The bossnut is a great bike I definitely recommend it.

4.43 out of 5

Boss nut evo

Got this bike on ride to work scheme can’t fault it one bit other then change of pedals and dropper post other than that top bike for value

4.43 out of 5

Great bike, not great paint job

The bike is really good, changed the pedals, added a dropper post and is a really good ride, the paint job however chips to the metal really really easily, so much so that the dropper post cable actually rubs it off

4.43 out of 5

Amazing bike for money

Had my EVO for just under a year and wow what a year its been, this bike has taken everything I've thrown at it recently Cannock chase and wow what an amazing time had on this bike, few little upgrades as I struggle with an old injury but still wow what a bike for the money. Also if you do buy this bike or any other bossnut check out Calibre Bossnut Riders Group on Facebook plenty of advice and regular meet ups and rides out!
100% recommend this bike to anyone!!

4.43 out of 5

Excellent bike

Had the bike for 3 weeks now and it is extremely good, have noticed how quick it is down the trails in comparison to more expensive bikes and I am not a brilliant rider either.....I did a lot of looking, hours spent reviewing bikes etc. And this is 100% worth every penny. Really happy with it, the parts are excellent for the price too sram gears etc. You don't get this on more expensive bikes as you pay for the frame and end up having to upgrade and spend loads on better, forks, gear sets, rear shock etc. Would definitely recommend.

4.43 out of 5

Can't beat it for the money!

This bike is amazing value for money! I ride at least once a week in all weather conditions with riders that are better than me, and are always pushing my limits, and this bike has taken everything I can throw at it! Even my friends with more expensive bikes say how good it has stood up to the heavy riding we have been doing! This thing is a value for money trail weapon!!!!!

4.43 out of 5

The Best Yet!

Having owned the last 2 incarnations of the Bossnut (read the reviews) I can genuinely say that this is the best yet. Very small improvements and changes add up to make one hell of a bike. Ignore any review that doesn't give this bike 5*s because numptys cant get the tyre off. Straight out the box this is a very well sorted bike. Balanced, fast and grippy. The new bars are a dream and the 1x11 is fast and precise. It climbs well and comes down even better and faster than previous models. I am a very happy customer. Well done to the Calibre guys who have tweaked the already game changing Bossnut into this....The awesome Evo. As I said about the last ones there is nothing better in this price bracket and some.

4.43 out of 5

Calibre bossnut evo

Great handling,very responsive looks fantastic,is very fast on downhill runs,the suspension soaks up punishment like its not there,the build quality of this bike is very impressive,I would go as far as to say its the best bike I've ever had the pleasure to own,this is my third calibre bike I'm very impressed with this brand well done calibre


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