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Planet X Bikes

On-One Big Dog SRAM SX 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 35 Gold RL DebonAir 130mm Fork
  • SRAM SX Eagle 12 Speed Drivetrain
  • SRAM Level Hydraulic Brakes
  • WTB I30 29er Wheels
  • Approx Bike Weight 14.7KG

£824.99  £1,099.99

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On-One Big Dog SRAM SX Mountain Bike From £824.99 £1,099.99
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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.

SX Eagle

The new SX Eagle is your entry point to the SRAM Eagle Ecosystem. Sharing many features with the rest of the Eagle Ecosystem like the proven SRAM 1x-specific X-HORIZON™ body design, it can accommodate up to 10-50T 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, relible, gearing range with a single 32 tooth crankset utilising DUB technology. Enough range to ensure you can fly downhill or comfortably spin up the steepest climbs.

Level hydraulic brakes

The SRAM Level brake levels the playing field with power and reliability stuffed into a lightweight package. SRAM’s direct link design produces a solid, positive feel the second you squeeze the lever. It offers a no-nonsense solution to give you precise control.

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 Level Hydraulic Disc Brake / Front / 900mm / Post Mount 20mm Spacers
BrakeSRAM Level Hydraulic Disc Brake / Rear / 1600mm / 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
CassetteSRAM PG-1210 Eagle 12 Speed Cassette / 11-50

SRAM Chain PC NX Eagle / 126 Links / 12 Speed

Crank SetSRAM SX Eagle DUB Crankset / 170mm / 32 Tooth / BOOST
Gear LeversSRAM SX Eagle Trigger Shifter / 12 Speed Right
Head SetSelcof Headset Spacer Set / 1 1/8" / 15mm + 10mm + 5mm / Black
Head SetSelcof Semi-Integrated Cup Cartridge Bearing Headset
Rear MechSRAM SX Eagle AL Rear Mech / 12 Speed
Seat ClampSelcof Forged Alloy Bolt Up Seatclamp V3 / 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 SX 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 Level brakeset, top-flight 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.



The Rockshox 35 Gold offers a stiff chassis for rough and choppy terrain in a tuneable package to allow efficient pedalling performance. With trail friendly 130mm of travel via a motion control damper with lockout adjustment and rebound

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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