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Calibre Dune Fat Bike

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Retail Price £700.00Was £599.00

Colour: Yellow
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An over-sized monster of a bike that goes against the grain and proves that fat is fast!

Calibre's Dune is a great value fat bike designed specifically to tackle UK trails, while still being a great choice for shredding across snow and sand.

We've taken standard fat bike geometry and tweaked it for faster, more aggressive riding in normal UK trail conditions. The Dune frame realises this geometry with an incredibly light, strong aluminium frame with huge clearance for big tyres and lots of mud. Hand-welded throughout, it's an incredible frame that makes the most of fat tyres' natural suspension and deserves to be ridden hard.

Weight is an issue since the wheels are so much wider than normal, which is why we use lightweight aluminium rims with cutout sections for even lower weight. Seated on these rims are a pair of Kenda Juggernaught Pro tyres*, one of the most popular fat tyres on the market and lighter than those used on the original incarnations of this stunning bike.

Making these wheels spin is a 2x8 Shimano drivetrain with a wide-ranging 11-34T cassette providing a huge spread of gears for varied terrain and conditions. Shifting is smooth and responsive across the entire 16 gear range thanks to advanced technology trickled down through the years from Shimano's pro-level XTR system. Powerful Tektro HD-M290 mechanical disc brakes take care of stopping power with 160mm rotors front and back.

The Calibre Dune slashes the pricetag while maintaining an incredible specification, giving you the perfect opportunity to get into fat biking and add another bike to your stable without breaking the bank.


*Please note the images are for illustrative purposes only, the Dune Bike comes with Kenda Juggernaught Pro tyres and NOT Schwalbe Jumbo Jims as shown.


Wheel Size: 26"
Frame: Lightweight 6061 alloy frame with trail-tuned fat bike geometry and 12mm bolt through dropouts
Fork: 6061 oversized alloy trail forks with 15mm bolt through
No. of Gears: 16
Gear Details: Shimano Altus and Alivio
Gear Shifters: Shimano Altus 2 x 8 speed
Front Derailleur: Shimano Alivio direct mount
Rear Derailleur: Shimano Altus
Chainset: Lasco Fat Bike
Cassette: Shimano 11 - 34T
Brakes - Type: Mechanical Disc
Brakes - Details: Tektro Novela mechanical disc brakes with 160mm 6 bolt rotors
Brakes - Levers: Tektro Auriga
Weight: 13.2Kg
Rims: Calibre Fat Bike drilled double wall
Tyres: Kenda Juggernaught Pro
Front Hub: KT 15mm x 150mm 32H
Rear Hub: KT 12mm x 197mm 32H
Stem: Calibre Trail 70mm extension
Saddle: Calibre Dune single line
Handlebar: Calibre trail 700mm 1" rise 9 degree backsweep
Head Set: FSA No. 57
Pedals: Platform pedal
Gender: Mens
Seatpost: Alloy 31.6mm 350mm


Dune Geometry
Medium Large
Seat Tube 406mm 440mm
Effective Top Tube  585mm 610mm
BB Drop 60mm 60mm
Rear Centre 465mm 465mm
Seat Angle 69° 69°
Head Angle 68° 68°
Head Tube Length 105mm 110mm

History of the Fat bike

Fat bikes have taken the mountain biking community by storm over the last few years. Fat bikes are mountain bikes with huge 4-5" tyres run at very low pressures. They were originally designed for use in snow and sand where the big, low pressure tyres float on the surface, letting you ride in conditions when your tyres would normally sink and get stuck.

Now people have realised that the big tyres provide a sort of natural suspension and that they are great fun to ride on normal trails in normal conditions too. The big wheels simply soak up bumps and roll over obstacles that might upset normal mountain bike wheels. The low pressure tyres also mean a unique, fluid riding style that is incredibly fun and unlike any other kind of mountain biking!

That's the kind of riding that the Dune has been designed for.

Reviews (20)

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  • 4 out of 5
great bike shame about the chain and pedals, 02 March 2017
By fatboy (Poole)
Well, I have had the bike for 6 weeks and I have just dropped it off for its 6 week service.

The bad (not too bad but more downsides):
1, The pedals, as soon as they get wet they may as well be made of ice. As Mr Bon Jovi would say, slippery when wet.
2, The chain; previous reviews have highlighted the chain as being poor, I think it is a combination of a lack of clutch rear derailleur and long chain length that leads to repeated chain failures. By failure i mean the chain comes off while riding on rougher ground and it gets wedged between the frame and chain ring.
3, Hydraulic brakes sets can be bought for £40, less if you buy in bulk. I don't understand why it doesn't have them. The brakes are just about sufficient but the hydro would make it exceptional.

The good;
so many good things about this bike, if rides well, it feels lighter than you would expect and it feels very sturdy.
One thing that is not stated in the description s that the rims and tyres are tubeless ready, add some fluid, tubeless valves and a huge blast of air and you're tubeless.

If i could advise Calibre to change anything it would be to have a single front chain ring, a larger range on the rear cassette and clutch rear derailleur. The costs saved on front shifter, front derailleur and twin chain rings would hopefully pay for the majority of this change and improve the bike no end with a small increase in purchase price.

Overall I am very pleased with this bike, I have ridden through single track, down some quite bumpy fast downs and through deep mud and it just keeps coming back fr more.

I would recommend this bike for someone that wants something a little different, or for someone that wants a great frame, good wheel set and will upgrade components for better replacements when the originals wear out.

  • 5 out of 5
Fantastic fun, great value FatBike, 07 January 2017
By Spikey259 (Wiltshire)
Purchased the Dune August 2016, having now covered 400+ miles of riding in over 30+ rides of various trail conditions, I have been so impressed, felt obliged to write a review.

If you are lookng for a great value FatBike, this ticks all the boxes. It's light (for a FatBike), great build quality, and perfectly acceptable components. I immediately swapped the mechanical disc breaks to hydraulic breaks as needed the stopping power reassurance for the type of riding I do, but the rest of the stock components work well. The supplied tyres are extremely light, great for fast rolling summer dry trail rides, however the tread was not so great for the wet winter mud, so replaced tyres with On-One Fatty's for my winter rides.

Riding this bike will put a smile on your face, ideal for trail/cross country riding, not quite so quick down the more technical descents as my full-suss mtb, but an overall more satisfying ride. I have found running the tyre pressures at 8 psi is best.

Frame geometry is spot on, I'm 5ft 6" and purchased Medium frame.

Great bike, fantastic fun, recommended!

  • 4 out of 5
great bike but...., 21 December 2016
By alan h (Brora)
This is my first new bike that i have ever had, although i've had bikes in the past i haven't been using them like this one thats for sure. I've bought this bike as a do all bike and it really does do that, i've taken it down the beach, up hills and on long cross country tracks . there are some draw backs to this bike and they are the chain , i can clean it after every ride with the park tool cleaner and i still get chain suck,i'm not sure if its the chain , the chain set or the frame can't handle a double cog at the front who knows,if i didn't clean it i just wouldn't get anywhere on the bike. the front brake is ace but the back one is really poor,i've cleaned the disc but it doesn't make much difference.the tyres aren't the greatest for winter muck and they aren't very puncture resistant , so i might just change them for winter tyres(changing the tyre pressures by a couple of psi makes a huge difference to the way the bike handles). ive changed the seat too as its like siting on a plank of wood.After having the bike for over a month now i would recommend it to someone wanting something different from the normal and a bike that will go almost anywhere,i have my old mtb and its really odd cycling it, the comfort has gone and the tyres look really really thin....i'll stick with the fat bike for now, smiles allround :)

  • 4 out of 5
Great value but 14.4 instead of 13.2 kg, 20 November 2016
By Lachman (Poland)
Important info for those hoping for a truly lightweight fat bike - my size M bike weighs 14.4 kgs, not 13.2 as specified on the website. Not a big difference but still...

Some quick observations after 40 kms in mixed terrain and 50 kms on the beach:

- size M frame is OK for riders up to my heght (179 cms), taller people should choose size L;
- build quality seems very good;
- the drivetrain is quite acceptable, I don't think you really need anything much better in a bike like this;
- one info missing from the website is the size of chainrings: 36/24T
- the weakest part of the bike are the brakes. Perhaps it's about adjustment, but so far the rear brake works well, the front is too weak for any serious descents.
- the tyres (Kenda Juggernaut Pro) are very light, but also appear not very durable and seem to have quite high rolling resistance. I was able to ride 27-28 km/h on flat tarmac but only with significant effort. On slightly wet beach sand I was able to average 15 km/h with about 0.7 bar (10 psi);

So much for the first impressions, will add a longer review after riding some more.

  • 5 out of 5
Fun fatty fun, 07 November 2016
By ssnowman (London)
Brilliant. Without doubt the best VFM bike I have ever bought. I'm not saying it's perfect, the drivetrain is obviously low end and shifting is not the smoothest, but I'll run it as is until it needs replacing. The cable discs aren't as bad as I thought they would be and I intend to see how i get on with them for now. It's really put the fun back into mountainbiking for me. The frame, forks, wheels and tyres are standout items and the overall weight is a lot lighter than anticipated.

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