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Planet X Bikes

On-One Big Dog SRAM GX Mountain Bike

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A great handling bike with a compliant steel frame, The Big Dog provides an intuitive ride...

A great handling bike with a compliant steel frame, The Big Dog provides an intuitive ride for any trail. Equipped with 29er wheels and a 130mm fork, itll handle the rough while offering a lively character on smoother trails too. With plenty of clearance for wide tyres also, the Big Dog will be your perfect companion for any type of ride, whatever the terrain or conditions.

  • Rockshox 130mm 35 Gold Forks
  • SRAM GX 12 speed drivetrain
  • SRAM G2 R Hydraulic Brakes
  • WTB I30 29er Wheels
  • Approx Bike Weight (MED) 14.7KG

  • £1,399.99

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    On-One Big Dog SRAM GX Mountain Bike From £1,399.99
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    Massively adaptable, The Big Dog will instil fun, agility, and confidence to your ride. From the trial centre, to technical singletrack, and on to multi day bikepacking epics, The Big Dog is at home on all. The 65 degree head angle gives confidence on steep chutes. 444mm chainstays for technical stability. The 58mm BB drop keeps rider planted whilst ensuring ground clearance. Balanced stack and slightly longer reach figures offer versatility, from endurance adventures to hardcore hardtail territory. The 75-degree seat tube angle puts you above the crank for better climbing efficiency.

    GX Eagle

    This GX groupset offers impressive performance with plenty of gears. Sharing many features with the higher end of the Eagle Ecosystem like the proven SRAM 1x-specific X-HORIZON™ body design, it can accommodate up to 10-52T cassettes. Eagle is a lighter, simpler, more durable, and easier to use drivetrain.

    Reliable wide range 1x gearing

    An 11-50 cassette provides a huge gearing range with SRAM’s top of the range aluminium 32 tooth crankset utilising DUB technology. Enough range to ensure you can fly downhill or comfortably spin up the steepest climbs.

    G2 hydraulic brakes

    The SRAM G2 delivers premium value braking without compromise. Powerful 4 piston callipers provide awesome single finger stopping power and reach adjust makes it easy to adjust your lever for maximum control. Think consistency, reliability and trust.

    Product TypeDefault Component
    ForkRockShox 35 Gold RL DebonAir 29" BOOST Fork / 130mm / 15x110mm / Gloss Black / Crown Adjust
    FrameOn-One Big Dog 29" Mountain Bike Frame / Slate Grey / Medium
    Bar Tape / GripsSelcof Knurl Grip / Black
    Handle BarSelcof Enduro6 Riser Handlebar / 780mm
    SaddleSan Marco Monza Start Wide Saddle / Black / Carbon Steel
    Seat PostSelcof Twelfty Alloy Inline Seatpost / 31.6mm
    StemSelcof Hot Box Stem / 50mm
    TyrePanaracer FireSport 29" Wire Bead Tyre / 2.35"
    Bottom BracketSRAM DUB BSA Bottom Bracket / 73mm
    BrakeSRAM Guide G2 R Hydraulic Disc Brake / Front / 900mm / Post mount (20mm bracket) 20P
    BrakeSRAM Guide G2 R Hydraulic Disc Brake / Rear / 1800 / 20 Post to IS
    Frame SpareM5 12mm Stainless Cage Bolt Black
    Brake spareSRAM Centreline Disc Brake Rotor / 160mm 6 Bolt
    Brake spareAvid Centreline Disc Brake Rotor / 180mm 6 Bolt
    Brake spareSRAM Hydraulic Hose Fitting Kit Includes Barb And Olive / Single Barb
    Brake spareSRAM Hydraulic Hose Fitting Kit Includes Barb And Olive / Single Olive
    Brake spareAvid MMX Matchmaker Clamp Black / Left
    Brake spareAvid MMX Matchmaker Clamp Black / Right
    CassetteSRAM PG-1210 Eagle 12 Speed Cassette / 11-50

    SRAM Chain PC NX Eagle / 126 Links / 12 Speed

    Crank SetSRAM GX Eagle DUB Crankset (Lunar Colourway) / 170mm / 32T / BOOST
    Gear LeversSRAM GX Eagle Trigger Shifter (Lunar Colourway) / 12 Speed / Right Hand
    Head SetSelcof Headset Spacer Set / 1 1/8" / 15mm + 10mm + 5mm / Black
    Head SetSelcof Semi-Integrated Cup Cartridge Bearing Headset
    Rear MechSRAM GX Eagle Rear Mech (Lunar Colourway) / 1 x 12 Speed
    Seat ClampSelcof Forged Alloy Bolt Up Seatclamp V2 / 35mm / 12MM / Black
    Inner TubePanaracer Inner Tube / 29 inch / 1.75-2.35 inch / Presta 48mm
    Wheel PairWTB I30 29er On Formula Boost 6 Bolt Wheelset / Shimano 11 Speed


    Using a 4130 frame and balanced geometry, Big Dog is our capable all-rounder ready to tackle any trail you fancy. Steel has always been the most compliant material to build frames with, keeping you fresh on the roughest of rides. Big wheels shod with 2.35 tyres maintain traction but also offer faster rolling speeds than smaller wheels. To put it simply, if your rides span from fast loops of your local singletrack to all-day epics, the Big Dog will fit the bill perfectly.



    SRAM 12 speed GX Eagle groupset offers a huge range of gears for getting you up any gradient. A clutch derailleur and narrow wide chainring mean the chain will be noise free in rougher terrain. This great drivetrain has been paired with SRAM's Guide G2 R brakeset, top-flight 4 piston stopping power combined with great lever ergonomics.



    WTB I30 29er Wheels provide fast rolling confidence. Tubeless compatible, the 30mm internal width gives you a wider tyre profile, offering more grip and control. Selcof finishing kit is used throughout the bike, including the wide and stable Enduro6 bars and a short 50mm stem for responsive yet controlled steering



    Out front is a Rockshox 35 Gold fork, providing 130mm of travel to take the sting out of rough terrain while not sapping your energy when pedalling out of the saddle. Using tuneable air spring and compression and rebound adjustments, you can personalise your suspension to your weight and riding style.

    Finishing Kit

    Finishing Kit

    Selcof MTB: Provided by Selcof, the Enduro 6 handlebar is paired with lightweight and dependable alloy stem and seatpost or Selcof Watchtower dropper post adds capability. The Saddle is Italian made from Selle San Marco

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