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    • Vitus Nucleus 27 VRS Mountain Bike 2021

  • Vitus Nucleus 27 VRS Mountain Bike

    The Vitus Nucleus is the 4x winner of MBR magazine £500 Hardtail of the Year award and provides more performance and style than anything else at this price-point. This 27 VRS model is agile and fast aboard 27.5" wheels and features a Shimano Deore 1x10-Speed groupset with an 11-46T wide-range cassette and hydraulic disc brakes. Ideal for XC riding and trail centre all-day epics, this hardtail provides a versatile and dependable performance anywhere.

    Modern Geometry and a 1x10-Speed Groupset

    Don’t be fooled by the price point, the Nucleus isn’t your run of the mill entry-level mountain bike. It’s the foundation of the Vitus mountain bike range, with aggressive geometry designed to get you hooked. Don’t say we didn’t warn you. For 2021 all models now come with 1x groupsets.

    SR Suntour Suspension and a Shimano Deore 1-10 Drivetrain

    The low, long, and slack geometry is coupled to 120mm of Suntour Air suspension taking care of any rough terrain you'll encounter on the trails while the brakes will give you ample stopping power. For 2021 the Nucleus has received a threaded bottom bracket for increased durability and a wide range groupset thanks to the Shimano 1x10 M5100 Deore groupset. A clutch activated rear mech, and a narrow wide 1x chainring up front will keep you on the trails all day.

    Vitus and Nukeproof Finishing Kit Components

    Vitus' tried and tested combination of WTB tyres and rims offers superior performance and grip. Finished off with a combination of Vitus and Nukeproof components the Nucleus 27 VRS has stepped up to take your riding to the next level.

    Please Note: Due to volatility in the bicycle supply chain we may slightly alter the specification of the component parts supplied with this bicycle. Where this happens we have listed the alternate product in the specification table and have ensured that this is of either equivalent or superior specification to the stock component.


    • Frame: Nucleus Aluminium 6061-t6 BSA Threaded Bb, IS Disc Brake Mounts, 135mm x 9mm QR
    • Fork: SR Suntour xCR32 Boost Air Lor Ds 27.5" Tapered Alloy Steerer, 120mm Travel, Post Mount Disc Brake Mounts, 110mm x 15mm Thru Axle 
    • Headset: FSA No:57b 1-1/8" Upper 1.5" Bottom
    • Handlebar: Nukeproof Neutron V2 Riser 6061 Alloy, 25mm Rise, 9° Back Sweep, 760mm Wide S/m, 780mm Wide L/xl 31.8mm
    • Stem: Vitus 50mm Alloy, 50mm Reach, 3° Rise
    • Grip(Tape): Vitus Lock On
    • Front Rim: Wtb St I30 Tcs 2.0, 27.5", 32h TCS Tubeless Tape Fitted
    • Rear Rim: Wtb St I30 Tcs 2.0, 27.5", 32h RCS Tubeless Tape Fitted
    • Hubs: Front Hub: Vitus MS6F Front Disc Hub, 32H/14G, Anodized Black, VITUS, 15x110mm, 6-BOLT TYPE; Rear Hub: Vitus K68R, Rear Disc Hub, 32H/14G, Anodized Black, 10x145x135mm, 6-BOLT TYPE, 8/9/10S, W/Anodized Black Semi-RLCA QR, W:151MM
    • Front Tyre: WTB Vigilante Comp High Grip Compound, 27.5" x 2.3” 
    • Rear Tyre: WTB Trail Boss Comp 27.5" x 2.25”
    • Spokes: Vitus
    • Chain: KMC x10 10 Speed 114l
    • Crankset: Shimano Deore M5100 170mm, 30t 
    • Bottom Bracket: Shimano Bb52, BSA
    • Front Brake Set: Tektro HD-M290 or Clarks M2
    • Rear Brake Set: Tektro HD-M290 or Clarks M2
    • Rotors: Tektro TR180-TR160 or Clarks M2 180mm front, 160mm rear, 6 bolt
    • Rear Derailleur: Shimano Deore M5120, Shadow Plus, Long Cage, 10 Speed
    • Rear Shifter: Shimano Deore M4100 Rapidfire Plus, 10 Speed
    • Freewheel: Sunrace 11-46t 10 Speed
    • Saddle: Nukeproof Neutron
    • Seat Post: Vitus 6061 Alloy, 31.6mm x 400mm, 0mm Offset
    • Seat Screw: Vitus Bolt 34.9mm 
    • Weight: TBC

    Easy Assembly

    When you order a bike, one of our trained mechanics will carefully prepare and pack your bike for shipping. Upon delivery, the assembly is simple and all necessary tools and plastic pedals are conveniently included in the box.

    Depending on the delivery service and destination, bikes will either be delivered in a large or a small box. Below is a guide as to how your bike will arrive:

    • All bikes for delivery within the UK and Republic of Ireland will be delivered in a large box, except for kids’ bikes and BMx bikes, which are always delivered in manufacturer’s boxes.
    • All bikes for delivery within the EU on a standard service will be delivered in a large box. If an express delivery option is chosen, your bike will be packed into a small box. Again, the exception is kids’ bikes and BMx bikes, which are always delivered in manufacturer’s boxes.
    • All bikes for worldwide delivery outside the EU will be delivered in small boxes.

    This video demonstrates assembly from a SMALL BOx.

    This video demonstrates assembly from a LARGE BOx.

    Buy Vitus Bikes from Chain Reaction Cycles, the World's Largest Online Bikestore.




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