Set Currency:
Your Basket - 0 Items - £0.00 Checkout
CBOOBDSX
On-One Big Dog SX On-One Big Dog SRAM SX Mountain Bike
  • On-One Big Dog SRAM SX Mountain Bike
  • On-One Big Dog SRAM SX Mountain Bike
  • On-One Big Dog SRAM SX Mountain Bike
  • On-One Big Dog SRAM SX Mountain Bike
  • On-One Big Dog SRAM SX Mountain Bike
  • On-One Big Dog SRAM SX Mountain Bike
  • On-One Big Dog SRAM SX Mountain Bike
  • On-One Big Dog SRAM SX Mountain Bike
  • On-One Big Dog SRAM SX Mountain Bike
In stock
Bikes showing as in stock we aim to build on Wednesday 29th of January.
Don't forget to choose your custom options, and look at the amazing deals on wheels too!

Pre-ordered bikes will take a little longer, but we'll keep you in the loop.
From £999.99
In stock

The BigDog is our progressive 29er steel hardtail. Designed for British conditions, big days out, sessions in the woods, and everything in between..

Buy Now
Finance Brought to you by V12 Retail Finance
Finance Options Available - Spread the cost of this bike over 10 months with Interest-Free Credit or Spread the cost over 12, 24 or 36 months.
Find Out More

Description

On-One invented the hardcore hardtail with the Inbred and 456 models that launched the brand - doing things differently 20 years ago. The Big Dog is a perfect progression of that packing 29in wheels into a chromoly hand welded frame that give up to date handling at an incredible price.

Triple and double butted 4130 tubing, hand TIG welded into a contemporary chassis, with routing for 1x drivetrain and stealth dropper post.

The 44mm headtube takes tapered forks and keeps things tidy and easily upgradeable. A threaded BSA bottom bracket shell means no creaks or weird workshop confusion. A 12mm though axle rear dropout sits at Boost 148 spacing to get the best tyre clearance and wheel strength and stay bang up to date.

A tough chainstay plate means great tyre and chainring clearance and extra durability too.

Gussetted top and down tubes keep the front of the frame strong, and let us use optimised main tubes for better handling.

The Big Dog 29 comes in four sizes with contemporary reach dimensions for riders looking for that long, low feel with a short stem. It's set to be a classic.

Paint finish includes a Phosphate and Laquer version which will rust in use, but we love it. If you're disturbed by less than perfect finishes, it's best you avoid this.

Fork - Rock Shox 35 Gold has same size stanchions as a Lyrik so it tracks super-well in the rough. 130mm is spot on for 29in wheels so the front end doesn't get too high.

Groupset: SRAM SX Eagle 1x12. SRAM's entry level Eagle groupset packs in 12 gears, a huge gear ratio and the best chain retention and gear shifting that you simply won't believe how good these new groupsets have got.

Wheelset: BOOST spaced wheelset, built for some fun, rough and tumble and mile after mile longevity. 29ers roll a little faster, offer more stability and gobble up the trails.

  • Weight: 14.4kg (med)

      NOTE: Please make sure you check the size guide to order the correct size of this frame. If you are unsure please contact our Customer Service Department

Full Spec

Custom options available
On components showing this spanner
Brake Setup UK Brake Lever Setup Rear Brake Left
Grips On-One Half Bob Lock-On Foam Grips / Black
Handlebar On-One Enduro6 Riser Handlebar / 780mm / 31.8mm / Black
Saddle San Marco Monza Start Saddle / Black / Carbon Steel
Seatpost On-One Twelfty V2 6061 Alloy Seatpost / 31.6mm / 400mm / Black
Stem On-One Hot Box V2 Stem / 60mm / 7 Degree / 31.8mm
Tyres Panaracer FireSport 29" Wire Bead Tyre / 2.35"
Inner Tube Panaracer Inner Tube / 29 inch / 1.75-2.35 inch / Presta 48mm  
Brake spare SRAM Hydraulic Hose Fitting Kit Includes Barb And Olive / Single Olive  
Brake spare SRAM Hydraulic Hose Fitting Kit Includes Barb And Olive / Single Barb  
Head Set Planet X Headset Spacer Set / 1 1/8" / 15mm + 10mm + 5mm / Black  
Seat Clamp On-One Forged Alloy Bolt Up Seatclamp V2 / 34.9mm / 15mm / Black  
Brake spare Jagwire Vortex Vento 6 Bolt 180mm Disc Rotor  
Brake spare Jagwire Vortex Vento 6 Bolt 160mm Disc Rotor (Rever Branded)  
Bottom Bracket SRAM DUB BSA Bottom Bracket / 73mm  
Brake SRAM Level Hydraulic Disc Brake / Front / 900mm / Post Mount 20mm Spacers  
Brake SRAM Level Hydraulic Disc Brake / Rear / 1600mm / 20 Post to IS  
Chain SRAM SX Eagle 12 Speed Chain / 126 Link  
Head Set Selcof Semi-Integrated Cup Cartridge Bearing Headset For Tapered 1 1/8th 1.5 Fork Steerer  
Gear Levers SRAM SX Eagle Trigger Shifter / 12 Speed Right  
Crank Set SRAM SX Eagle DUB Crankset / 170mm / 32 Tooth / BOOST  
Cassette SRAM PG-1210 Eagle 12 Speed Cassette / 11-50  
Rear Mech SRAM SX Eagle Rear Mech / 12 Speed  
Wheel Pair Alex Volar 3.0 29er Boost 6 Bolt Wheelset / Shimano 11 Speed  
Fork RockShox 35 Gold RL DebonAir 29" BOOST Fork / 130mm / 15x110mm / Gloss Black / Crown Adjust  

Key features

Finance Available
Spread the cost of this bike over 10 months with Interest-Free Credit or Spread the cost over 12, 24 or 36 months. Subject to Status
FIND OUT MORE
Customise your bike
We hand build our bikes, so you can customise your bike how you like it. Choose your frame size then select from the array of choices so your bike is just how you like it.
Direct To Customer
At Planet X we supply everything we make direct to customer, there's no middle men or wholesalers adding anything to the cost. That's why we're able to offer you unmatched value for money- straight from our warehouse to your door
Yorkshire Born and Bred
Our bikes are designed, tested and assembled in Yorkshire. Every model is put through its paces across the toughest road or off-road routes that the Peak District has to offer. Just like us, they are Yorkshire Born and Bred

Geometry

Geometry

Size & Specs

Bike frame geometry
  SMALL MED LRGXLG
AHead Angle (degrees)65.065.065.065.0
B Head Tube (mm)100110120135
C Top Tube Effective(mm)580615630655
D Seat Tube Angle (degrees)75757575
E Seat Tube C-T Actual (mm)380420460500
F Chainstays (mm)444444444444
G BB Drop (mm)58585858
I Stack (mm)609619628641
J Reach (mm)415446460480
K Front Centre (mm)725762779807
M Fork Offset (mm)51515151
O Wheelbase (mm)1169120612231251
P Standover (mm)XXXX

Buying a bike from Planet X?

Why are prices so low?
Our prices are lower than the competition because we sell direct to you the customer; there are no middlemen to take a slice of the price you pay. We design and build everything ourselves so you get exactly what you pay for and that includes amazing service and unrivalled value for money.

How it works
You can order online via our website,  If you would like advice on sizing and specifications then you can email our customer service dept. You can also contact us via Live Chat

Buying online in confidence
Simply select your frame size and colour below and choose from the range of customisable options. Your bike will then be passed to one of our expert mechanics to build YOUR bike exactly the way YOU want it.

Buy in confidence

Crash replacement policy

2 year warranty

Custom built to your specifications

Built to order in the UK
Built to order in the UK

We design and assemble every bike we sell right here in Yorskhire. We work with the leading component vendors and fabrication facilities  to create bikes of unrivalled performance and value for money.

Can't see the upgrades you want on your bike? Give us a call today and we can build the custom bike of your dreams.

Buy Now

Need help? E-Mail our technical experts

https://www.planetx.co.uk/contactus

Custom build option available
add to basket and customise
Build your bike in 3 simple steps.
Step 1: Select bike size and colour (by choosing a frame)
Frame View size guide Stock
Gloss Orange Large Gloss Orange Large £999.99 Sold Out
Gloss Orange Medium Gloss Orange Medium £999.99 In Stock
Gloss Orange Small Gloss Orange Small £999.99 In Stock
Gloss Orange X-Large Gloss Orange X-Large £999.99 Sold Out
Raw Phosphate Medium Raw Phosphate Medium £999.99 In Stock
Raw Phosphate Small Raw Phosphate Small £999.99 In Stock
Step 2: Choose your options

Need help?

Contact our technical experts

Choose Components

Brake Setup Choose your braking setup.
Select
 UK Brake Lever Setup Rear Brake Left  FREE i
Select
 EURO - USA Hydraulic Disc Brake Lever Setup Rear Brake Right + £50.00 i
Frame
Select
 On-One Big Dog 29" Mountain Bike FrameRaw Phosphate | Small  FREE i
Select
 On-One Big Dog 29" Mountain Bike FrameGloss Orange | Medium  FREE i
Select
 On-One Big Dog 29" Mountain Bike FrameRaw Phosphate | Medium  FREE i
Select
 On-One Big Dog 29" Mountain Bike FrameGloss Orange | Small  FREE i
Grips
Select
 On-One Knurl GripBlack + £2.98 i
Select
 On-One Half Bob Lock-On Foam GripsBlack  FREE i
Select
 On-One Half Bob Lock-On GripsBlack + £4.98 i
Handlebar Our standard build is usually perfect but you can choose a bar that suits your needs.
Select
 On-One Oversize Flat Bar HandlebarPolished Black | MTB | 31.8mm Clamp + £9.98 i
Select
 On-One Enduro6 Riser Handlebar780mm | 31.8mm | Black  FREE i
Select
 On-One Knuckleball Carbon HandlebarHard | Black | 777mm + £45.00 i
Select
 On-One Knuckleball Carbon HandlebarHard | Black | 747mm + £45.00 i
Saddle Have a preference on saddle design or simply want a lighter saddle? Upgrade now!
Select
 San Marco Monza Start SaddleBlack | Carbon Steel  FREE i
Select
 San Marco Bioaktive Sportive Fusion Large Saddle + £7.50 i
Select
 Selle Italia X3 BOOST SaddleBlack | Alloy + £14.98 i
Select
 Selle Royal Tec Reactor Tm Saddle Black Steel Rail83816844 + £7.99 i
Select
 San Marco Aspide Open Start Up SaddleMagnesium | Black + £19.99 i
Select
 Selle Royal Sport Performa Seta S1 SaddleBlack + £29.98 i
Select
 San Marco Concor Open Fit Racing SaddleXsilite | Black + £49.98 i
Stem Our standard build is normally great, but you can change the geometry of your ride and get the right fit - choose the stem length that's right for you.
Select
 El Guapo Stallion Stem60mm | Grey + £5.00 i
Select
 On-One Hot Box V2 Stem70mm | 7 Degree | 31.8mm + £5.00 i
Select
 El Guapo Stallion Stem50mm | Grey + £5.00 i
Select
 On-One Hot Box V2 Stem60mm | 7 Degree | 31.8mm  FREE i
Select
 On-One Hot Box V2 Stem50mm | 7 Degree | 31.8mm + £5.00 i
Tyres
Select
 Vittoria Goma 29 Inch Folding Tyre2.4 inch | Black + £15.00 i
Select
 Panaracer FireSport 29" Wire Bead Tyre2.35"  FREE i
Select
 Continental Trail King 29" Folding Tyre2.4" + £20.00 i
Select
 On-One Smorgasbord 29"x2.25" Tyre Trail Extreme Folding Bead Dual 60/42a Black + £30.00 i
Select
 Continental Mountain King II Protection Black Chilli Folding Tyre29" | 2.4" | Black + £35.00 i
Select
 Maxxis Aggressor EXO TLR 29 Folding Tyre29" | 2.3" + £30.00 i

Optional Accessories

Bottle Cage We're famous for our bottle cages, don't miss out and treat your yourself to a bottle cage for your new bike.
Select
 NO THANKS  FREE
Select
 Planet X Alloy Bottle CageSIlver + £2.99 i
Select
 Planet X Alloy Bottle CageBlack + £2.99 i
Select
 Planet X Ambi Plastic Bottle CageBlack + £4.99 i
Select
 Planet X Nightwolf Plastic Bottle CageBlack + £4.99 i
Select
 Planet X Bi Plastic Bottle CageBlack + £4.99 i
Select
 Planet X Fang Plastic Bottle CageBlack + £4.99 i
Select
 Planet X Stainless Steel Bottle CageBrushed + £7.99 i
Select
 Planet X Mantis Alloy Bottle CageBlack + £9.99 i
Select
 Selcof Carbon BottlecageBlack + £14.99 i
Select
 Planet X Pro Carbon Bottle CageBlack | Gloss + £14.99 i
Select
 Planet X Pro Carbon EVO Bottle CageMatt Black + £14.99 i
Select
 Planet X SL Carbon CageGloss 3K Black + £14.99 i
Select
 Selcof Carbon BottlecageBlack and Silver + £14.99 i
Select
 Planet X Pro Carbon EVO Bottle CageGloss Black + £14.99 i
Select
 Planet X SL Carbon CageGloss UD Black + £14.99 i
Select
 Planet X Pro Carbon Bottle CageBlack | Matt + £14.99 i
Select
 Planet X SL Carbon CageMatte 3K Black + £14.99 i
Select
 Planet X Titanium Bottle CageBrushed + £24.99 i
Pedals New bike? Get some new pedals!
Select
 NO THANKS  FREE
Select
 VP-531 Aluminium Flat Platform PedalsBlack + £17.99 i
Select
 Jobsworth SPD Compatible Pedals Black With Cleat + £17.99 i
Select
 Jobsworth Dual Sided MTB Pedal Black With Cleat + £19.99 i
Select
 El Guapo Toro Flat PedalBlack + £19.99 i

Rest of range

Subscribe to our newsletter

Be the first to hear about new products, competitions and vip discounts