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Your Bike, Built Your Way
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
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1 Review
From £999.99
FINANCE From £32.02/mth* More info
In stock Bikes in stock built within 10 - 12 working days.

Due to unprecedented demand these bikes cannot be built until week commencing 27th July

Sweet spot handling with a classic steel sprung vibe, Big Dog is your 29er trail best friend. Big Dog blends modern 29er geometry with a classic steel ride character to create a smooth rolling, sweetly sprung all rounder with tons of character. Hand welded triple butted steel frame with 130mm of fork travel and a big tyre compatible back end guarantee all day comfortable control. Dropper post routing and rack fixtures make Big Dog your top value backcountry epic or bike to work best friend.

Full description and spec

Size guide and geometry
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Description

Hand welded triple butted, gusset reinforced steel main tubes with custom tapered, curved and plated back end for a trail smoothing character with bombproof strength. Balanced 29er handling in four sizes. Stable and confident without being crazy stretched and slack. You want Hello Dave for that.

Threaded BB shell, big clearance chain stay plate Boost bolt through axle and replaceable gear hanger for crash/transport survival.External cable routing for the smooth, simple operation. Stealth dropper post routing and rear rack mounts for enduro or exploro. Lacquered raw finish for naked build detail appreciation (with eventual cosmetic rat bike rust) or genuinely dayglo paint for ultimate pop.Custom upgrades let you build your ultimate trail best friend for a crazy low cost.

Rockshox Judy Silver TK 29" Boost Fork for uncompromised control at an affordable price.130mm of super smooth travel for attacking the trail without unbalancing the handling. Full size legs for accurate handling and smooth stroke however hard you ride. Adjustable DebonAir spring and Motion Control damping are easy to adjust for every ride and rider.

SX Eagle is SRAM's entry level Eagle groupset. Positive, 12 speed sequential shifting up to a 50 tooth wall climbing winch. Clutch rear mech and X-Sync2 tech for quiet chain security however rowdy you get. Ultra durable steel chainring with DUB axle to power up climbs and laugh off big landings. SRAM Level hydraulic disc brakes for effective, lightweight all weather control.

29er wheels roll smoother and faster however rough it gets. Tough, wide tubeless ready Alex rims for extra grip and support Hand finished 32 spoke build for durable strength and sweet ride feel. Quality sealed bearing Boost axle disc hubs. Panaracer FireSport 29 x 2.35in tyres are a classic all rounder tread for UK riding.

Dropper post is not included

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 Grips / Black
Handlebar Controltech CLS Alloy Flat Bar / 800mm / Red & White
Saddle San Marco Monza Start Saddle / Black / Carbon Steel
Seat Clamp On-One 6061T6 Forged Alloy Seatclamp Bolt Up / 34.9 mm
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"
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  
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 EXR30 29er on Formula Boost 6 Bolt Wheelset / Shimano 11 Speed  
Fork Rockshox Judy Silver TK 29" Boost Fork / 130mm / 15x110mm / Gloss Black / Crown Adjust  
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  
Inner Tube Impac SV29 29" Inner Tube UNBOXED / 1.5-2.35 / Presta 40mm  
Head Set Planet X Headset Spacer Set / 1 1/8" / 15mm + 10mm + 5mm / Black  
Brake spare Shimano SM-HB20 Centrelock Lockring  
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  
Head Set Selcof Semi-Integrated Cup Cartridge Bearing Headset For Tapered 1 1/8th 1.5 Fork Steerer  

Frame Details

Frame Material4130 DB
Frame Weight, Approx, (med) (g)2.7kg (Medium)
Fork 120-130mm
Fork Weight, Approx (g)TBC
FR Axle (mm)TBC
RR Axle (mm)148 BOOST
Seatpost Size (mm)31.6
Seat Clamp Size (mm)34.9
Front Mech TypeNA
Wheels29" or 650B
Max Tyre2.6" (29) 2.8" (650b)
Mudguard mountsNA
Rack MountsREAR
Bottle Cage Bosses1
Brake TypeChainstay Mount
Bottom Bracket73mm BSA
Headset Type44mm
Fork Length (mm)TBD
Cable RoutingEXT
Dropper Compatible

Max Chainring

Max Rear Rotor		Yes, Stealth

32t

160mm

Key features

Yorkshire Born and Bred
All our bikes are designed and tested around the hills, moors and Dales of Yorkshire. We also hand assemble them here when you order, so we can deliver your ideal bike direct to you at an incredible price.
SRAM SX Eagle Groupset
SRAM SX Eagle 1x12. SRAM's entry level Eagle groupset delivers 12 super wide ratio gears with silent chain retention, slick gear shifting and a super durable steel chainring.
On-One Big Dob MTB frame
Smooth steel, aggro angle, big wheel trail crusher.
Triple butted, tapered stay day ride smooth steel
Confidence boosting 65º head angle geometry.
Dropper post, rack and 29x2.5in tyre compatible.

Testimonials

Buying a bike from Planet X?

Why are prices so low?
We sell direct to the customer. With Planet X you get unrivalled value for money as we cut out the middleman. By designing and building everything ourselves, we provide excellent service, and make sure you get exactly what you pay for. This means we deliver first-class bikes, components, and accessories at the best prices in our industry.

How it works
You order your bike your way. Simply select the frame size and colour you want and choose from the range of customisation options with components to fit your needs. Your bike will be passed to one of our expert mechanics to build your bike exactly the way you want it.

Buying online in confidence
For advice on sizing and specifications, contact us via Live Chat and one of our in-house experts will be happy to assist with perfecting your bike. More information on building a bike is available on our dedicated bikes built to order page

Buy in confidence

Built in the UK

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 Yorkshire. Working with the leading component vendors and fabrication facilities, we create bikes with unrivalled performance and provide exceptional value for money.

Chat with one of our experts today and we will help put together the custom bike of your dreams.

Geometry

Geometry

Size

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
Buy Now

Need help? Contact our technical experts

Visit our Contact Us page

Custom build option available
add to basket and customise
Build your bike in 3 simple steps.
Step 1: Select size and colour (by choosing below)
Frame View size guide
ED Black No Decal Large ED Black No Decal Large £999.99
Customise
ED Black No Decal Medium ED Black No Decal Medium £999.99
Customise
ED Black No Decal Small ED Black No Decal Small £999.99
Customise
ED Black No Decal X-Large ED Black No Decal X-Large £999.99
Customise
Gloss Orange Large Gloss Orange Large £999.99
Customise
Gloss Orange Medium Gloss Orange Medium £999.99
Sold Out
Gloss Orange Small Gloss Orange Small £999.99
Customise
Gloss Orange X-Large Gloss Orange X-Large £999.99
Customise
Raw Phosphate Small Raw Phosphate Small £999.99
Customise
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 FrameED Black No Decal | Large  FREE i
Select
 On-One Big Dog 29" Mountain Bike FrameED Black No Decal | X-Large  FREE i
Select
 On-One Big Dog 29" Mountain Bike FrameED Black No Decal | Small  FREE i
Select
 On-One Big Dog 29" Mountain Bike FrameED Black No Decal | Medium  FREE i
Select
 On-One Big Dog 29" Mountain Bike FrameGloss Orange | Small  FREE i
Select
 On-One Big Dog 29" Mountain Bike FrameRaw Phosphate | Small  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 | Large  FREE i
Select
 On-One Big Dog 29" Mountain Bike FrameGloss Orange | X-Large  FREE i
Grips
Select
 On-One Half Bob Lock-On Foam GripsBlack + £5.00 i
Select
 On-One Half Bob Lock-On GripsBlack  FREE i
Handlebar Our standard build is usually perfect but you can choose a bar that suits your needs.
Select
 Controltech CLS Alloy Flat Bar800mm | Red & White  FREE i
Select
 Controltech LYNX Alloy Riser Bar800mm | Red/White  FREE i
Select
 Selcof Carbon Flat Handlebar740mm + £25.00 i
Saddle Have a preference on saddle design or simply want a lighter saddle? Upgrade now!
Select
 San Marco Dirty ED SaddleChromo | Black + £9.98 i
Select
 San Marco Monza Start SaddleBlack | Carbon Steel  FREE i
Select
 San Marco Monza Start Wide SaddleBlack | Carbon Steel + £14.98 i
Select
 San Marco Dirty ED SaddleManganese | Black + £14.98 i
Select
 San Marco Monza Start SaddleBlack Woven | Carbon Steel + £40.00 i
Select
 Planet X Exocet SaddleTi Rail | Black + £24.98 i
Select
 San Marco Shortfit Open SaddleXsilite | Narrow + £60.00 i
Select
 San Marco Shortfit Open SaddleXsilite | Wide + £60.00 i
Seatpost
Select
 On-One Twelfty V2 6061 Alloy Seatpost31.6mm | 400mm | Black  FREE i
Select
 Trans X Dropper Post JD-YSP12l Inc Remote31.6mm | 370mm | 100mm + £75.00 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 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
Select
 El Guapo Stallion Stem60mm | Grey + £5.00 i
Select
 On-One Hot Box V2 Stem70mm | 7 Degree | 31.8mm + £5.00 i
Tyres
Select
 Panaracer FireSport 29" Wire Bead Tyre2.35"  FREE i
Select
 Vittoria Goma 29 Inch Folding Tyre2.4 inch | Black  FREE 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 Ambi Plastic Bottle CageBlack + £4.99 i
Select
 Planet X Bi Plastic Bottle CageBlack + £4.99 i
Select
 Planet X SL Carbon CageGloss 3K Black + £14.99 i
Select
 Planet X SL Carbon CageGloss UD Black + £14.99 i
Select
 Planet X Stainless Steel Bottle CageBrushed + £14.99 i
Select
 Selcof Carbon BottlecageBlack + £19.99 i
Select
 Planet X Pro Carbon Bottle CageBlack | Matt + £19.99 i
Select
 Selcof Carbon BottlecageBlack and Silver + £19.99 i
Select
 Planet X Pro Carbon Bottle CageBlack | Gloss + £19.99 i
Select
 Planet X Pro Carbon EVO Bottle CageMatt Black + £19.99 i
Select
 Planet X Pro Carbon EVO Bottle CageGloss Black + £19.99 i
Pedals New bike? Get some new pedals!
Select
 NO THANKS  FREE
Select
 El Guapo Toro Flat PedalBlack + £29.99 i
Torque Wrench Set your bike up right and maintain it to manufacturers specifications with our torque wrench.
Select
 NO THANKS  FREE
Select
 Jobsworth Pro Torque Wrench Set + £34.99 i

Rest of range

Product Price

£999.99

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