On-One Big Dog SRAM GX AXS Mountain Bike On-One Big Dog SRAM GX AXS Mountain Bike On-One Big Dog SRAM GX AXS Mountain Bike
Frame
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.
Groupset
SRAM GX EAGLE AXS
With proven AXS wireless technology and the rugged durability of GX, it’s Eagle at its best. 100% water and dust proof. Featuring a massive 520% range, seamless compatibility, and the ability to customise with the AXS app, GX Eagle AXS is your access to the future.? With no cables to stretch or get clogged with dirt, it’s simplicity at its finest.
GX EAGLE AXS DERAILLEUR
Engineered to mirror XX1 and X01 Eagle AXS, SRAM GX Eagle AXS is rugged dependable. The incredible Overload Clutch allows the derailleur to sense impact and quickly disengage the motor gearbox, moving the derailleur out of harm's way in case of impact, before instantly returning to its position for a seamless riding experience.
GX EAGLE AXS CONTROLLER
The SRAM GX Eagle AXS?controller offers almost unlimited customisation. Giving the ability to assign different shifting function using the SRAM AXS app.
GX EAGLE DUB CRANKSET
The best aluminium crankset SRAM make. Featuring X-SYNC 2 tooth profile for secure chain control. DUB technology for better weather sealing.
XG-1275 EAGLE CASSETTE
The 10-52 tooth ratio gives an incredible 520% gear range. Giving you more ability to spin and recover on the toughest of climbs
SRAM AXS BATTERY
Offering approximately 20 hours of ride time or more, it removes in seconds and only takes an hour to charge. Checking battery life is easy. A green light means it’s close to full charge. Red means half charge. And flashing red means it’s time to charge up. To prolong life, the system goes into sleep mode when not in use.
Frame
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.
Groupset
SRAM GX EAGLE AXS
With proven AXS wireless technology and the rugged durability of GX, it’s Eagle at its best. 100% water and dust proof. Featuring a massive 520% range, seamless compatibility, and the ability to customise with the AXS app, GX Eagle AXS is your access to the future.? With no cables to stretch or get clogged with dirt, it’s simplicity at its finest.
GX EAGLE AXS DERAILLEUR
Engineered to mirror XX1 and X01 Eagle AXS, SRAM GX Eagle AXS is rugged dependable. The incredible Overload Clutch allows the derailleur to sense impact and quickly disengage the motor gearbox, moving the derailleur out of harm's way in case of impact, before instantly returning to its position for a seamless riding experience.
GX EAGLE AXS CONTROLLER
The SRAM GX Eagle AXS?controller offers almost unlimited customisation. Giving the ability to assign different shifting function using the SRAM AXS app.
GX EAGLE DUB CRANKSET
The best aluminium crankset SRAM make. Featuring X-SYNC 2 tooth profile for secure chain control. DUB technology for better weather sealing.
XG-1275 EAGLE CASSETTE
The 10-52 tooth ratio gives an incredible 520% gear range. Giving you more ability to spin and recover on the toughest of climbs
SRAM AXS BATTERY
Offering approximately 20 hours of ride time or more, it removes in seconds and only takes an hour to charge. Checking battery life is easy. A green light means it’s close to full charge. Red means half charge. And flashing red means it’s time to charge up. To prolong life, the system goes into sleep mode when not in use.
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📏 Sizing and Geometry

Rider Height Suggested Frame Size
5′4″ to 5′7″  Small
5′7″ to 5′10″  Medium
5′10″ to 6′1″  Large
6′1″ to 6′3″  X-Large

    SMALL  MED  LRG XLG
A Head Angle (degrees) 65.0 65.0 65.0 65.0
B Head Tube (mm) 100 110 120 135
C Top Tube Effective(mm) 580 615 630 655
D Seat Tube Angle (degrees) 75 75 75 75
E Seat Tube C-T Actual (mm) 380 420 460 500
F Chainstays (mm) 444 444 444 444
G BB Drop (mm) 58 58 58 58
H Stack (mm) 609 619 628 641
I Reach (mm) 415 446 460 480
J Front Centre (mm) 725 762 779 807
K Wheelbase (mm) 1169 1206 1223 1251

🔧 Build Kit

Selcof Forged Alloy Bolt Up Seatclamp V3 / 35mm / 12mm / Black
Bike Build Packaging Rear Derailleur Protector
Selcof Headset Spacer Set / 1 1/8" / 15mm + 10mm + 5mm / Black
Selcof Semi-Integrated Cup Cartridge Bearing Headset

🔧 Groupset

SRAM Guide G2 R Hydraulic Disc Brake / Rear / 1800 / 20 Post to IS
SRAM Guide G2 R Hydraulic Disc Brake / Front / 900mm / Post mount (20mm bracket) 20P
SRAM GX Eagle AXS Controller
SRAM DUB BSA Bottom Bracket / 73mm
SRAM GX Eagle DUB Crankset (Lunar Colourway) / 170mm / 32T / BOOST
SRAM XG-1275 Eagle 12 Speed Cassette / 10-52T
SRAM GX Eagle AXS Rear Derailleur / Lunar / With Battery Protector
SRAM Chain PC NX Eagle / 126 Links / 12 Speed
SRAM Centreline Disc Brake Rotor / 160mm 6 Bolt
Avid Centreline Disc Brake Rotor / 180mm 6 Bolt
Avid MMX Matchmaker Clamp Black / Left
SRAM Powerpack For AXS / 1 Battery
SRAM Hydraulic Hose Fitting Kit Includes Barb And Olive / Single Barb
SRAM Hydraulic Hose Fitting Kit Includes Barb And Olive / Single Olive

Finance with Newpay and Planet X

You could enjoy a credit limit of up to £5000, and once you’ve bought something, you can choose a payment plan to suit you. It’s super-easy to apply and we’ll even do a no-risk check first to see if you're eligible

Easy Assembly

Assembling your new bike couldn't be easier. Every bike comes expertly packed at least 95% pre assembled, with step by step instructions to get the bike ready to roll. 

So you can get out on that first ride without delay! 

Hand Built in South Yorkshire

All Planet X, On One, Holdsworth and Titus Bikes are expertly hand built to order in South Yorkshire.

Every bike is comprehensively inspected before shipping to ensure your bike is perfect when it arrives at your door.

Not sure on your size? Get Fitted!

Get fitted to your bike at Planet X Headquarters by one of our trained fitters. 

With our Mini Bike Fit, we can advise on sizing, optimise your ride for maximum comfort and efficiency and help you make the right component choices. all for a refundable deposit of £25.

Customer Reviews

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