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Open the door today's Advent calendar deal
On-One Big Dog SX On-One Big Dog SRAM SX Mountain Bike
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3 Reviews
From £999.99
FINANCE From £32.02/mth* More info
In stock Bikes in stock built within 12 - 15 working days

Sweet spot handling with a classic steel sprung vibe, the On-One 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, guaranteed all day comfortable control. Dropper post routing and rack fixtures make the Big Dog your top value backcountry epic or bike to work best friend.

Full description and spec

Size guide and geometry

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 SRAMs' 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.

Pedals not included? Why not?

Pedal choice is a personal thing. Most higher end bikes are expected to be ridden with clipless pedals. These are matched to cleats on the underside of your cycling shoes. There are a few standards of these, and most cyclists tend to stick with one standard across all their bikes. So, you don't need to buy multiple pairs of shoes! Thats why Planet X don't sell bikes with pedals included. If you wish to add pedals to your order, simply select an option from the drop-down menu.

NOTE: Please make sure you check the size guide to order the correct size of this frame.

Full Spec

Custom options available
On components showing this spanner
Brake Setup UK Brake Lever Setup Rear Brake Left
Fork Rockshox Judy Silver TK 29" Boost Fork / 130mm / 15x110mm / Gloss Black / Crown Adjust
Grips On-One Knurl Grip / Black
Handlebar On-One Enduro6 Riser Handlebar / 780mm / 31.8mm / Black
Saddle San Marco Monza Start Saddle / Black / Carbon Steel
Seat Clamp On-One Forged Alloy Bolt Up Seatclamp V2 / 34.9mm / 13mm / Black
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"
Bottle cage Steel Bottle Cage Bolt M5x16mm / Single  
Chain SRAM SX Eagle 12 Speed Chain / 126 Link  
Brake SRAM Level Hydraulic Disc Brake / Rear / 1600mm / 20 Post to IS  
Brake SRAM Level Hydraulic Disc Brake / Front / 900mm / Post Mount 20mm Spacers  
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  
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 Panaracer Inner Tube / 29 inch / 1.75-2.35 inch / Presta 48mm  
Brake spare Clarks CL Rotors / Silver / 160mm  
Head Set Planet X Headset Spacer Set / 1 1/8" / 15mm + 10mm + 5mm / Black  
Brake spare Clarks CL Rotors / Silver / 180mm  
Bottom Bracket SRAM DUB BSA Bottom Bracket / 73mm  
Head Set Selcof Semi-Integrated Cup Cartridge Bearing Headset  

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 Dog 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.

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

Size

Geometry

Sizing Guide

Rider HeightSuggested 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

Sizing Notes

All frame size recommendations are approximate. A good fit will also depend on the correct choice of stem length, correct bike set-up for the rider and riding style.

Correct frame size choice can vary greatly with riders' torso length. If you have longer legs and a shorter torso, go for a slightly shorter stem. If you think you are borderline between sizes, and you have longer legs and a shorter torso, go for the smaller frame size. If you have shorter legs and a longer torso, go for the larger frame size to get the extra top tube length.

As the frame sizes increase, so does the length of the head tube. If you are inflexible or perhaps have a history of back problems, consider going for a larger frame size. This will increase the relative height of the handlebars making the position less “extreme”. The larger frame will also have a longer top tube, so you’ll need to compensate for this with a shorter stem.

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 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 Small Gloss Orange Small £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
Fork
Select
Rockshox Judy Silver TK 29" Boost Fork130mm | 15x110mm | Gloss Black | Crown Adjust  FREE i
Select
RockShox 35 Gold RL DebonAir 29" BOOST Fork130mm | 15x110mm | Gloss Black | Crown Adjust £149.99 i
Frame
Select
On-One Big Dog 29" Mountain Bike FrameRaw Phosphate | Medium  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 FrameGloss Orange | Small  FREE i
Select
On-One Big Dog 29" Mountain Bike FrameED Black No Decal | Large  FREE i
Select
On-One Big Dog 29" Mountain Bike FrameRaw Phosphate | Small  FREE i
Select
On-One Big Dog 29" Mountain Bike FrameED Black No Decal | X-Large  FREE i
Grips
Select
On-One Knurl GripBlack  FREE i
Select
On-One Half Bob Lock-On Foam GripsBlack  FREE i
Handlebar Our standard build is usually perfect but you can choose a bar that suits your needs.
Select
On-One Oversize 600mm Flat Bar HandlebarPolished Black | MTB | 31.8mm Clamp £10.00 i
Select
On-One Enduro6 Riser Handlebar780mm | 31.8mm | Black  FREE i
Select
SB3 Raw Explicit HandlebarRed/Blue £15.00 i
Select
SB3 Unicolour TR740 HandlebarAbyss Blue £10.00 i
Select
SB3 Raw Explicit HandlebarWhite/Blue £15.00 i
Select
SB3 Unicolour TR740 HandlebarGore Red £10.00 i
Select
SB3 Unicolour AM740 HandlebarGore red | 20mm £15.00 i
Select
SB3 Unicolour AM740 HandlebarAbyss Blue | 20mm £15.00 i
Select
Controltech LYNX Alloy Flat Bar800mm | Grey & Black £29.98 i
Select
Controltech CLS Alloy Flat Bar800mm | Grey & Black £29.98 i
Select
Controltech LYNX Alloy Flat Bar800mm | Red & White £29.98 i
Select
SB3 Flowy EN740 HandlebarWhite/Black £20.00 i
Select
SB3 Flowy DH810 HandlebarWhite/Black £20.00 i
Select
Controltech CLS Alloy Flat Bar800mm | Red & White £10.00 i
Select
Controltech CLS Alloy Riser Bar800mm | Black/Grey £15.00 i
Select
Selcof Carbon Flat Handlebar740mm £25.00 i
Select
Selcof Carbon Riser Handlebar740mm £35.00 i
Saddle Have a preference on saddle design or simply want a lighter saddle? Upgrade now!
Select
San Marco Dirty ED SaddleChromo | Black £15.00 i
Select
San Marco Monza Start SaddleBlack | Carbon Steel  FREE i
Select
San Marco Monza Start Wide SaddleBlack | Carbon Steel  FREE i
Select
San Marco Dirty ED SaddleManganese | Black £30.00 i
Select
Planet X Exocet SaddleTi Rail | Black £24.98 i
Seat Clamp
Select
On-One Forged Alloy Bolt Up Seatclamp V234.9mm | 13mm | Black  FREE i
Select
On-One 6061T6 Forged Alloy Seatclamp Bolt Up34.9 mm  FREE i
Seatpost
Select
On-One Twelfty V2 6061 Alloy Seatpost31.6mm | 400mm | Black  FREE i
Select
Rockshox Reverb Stealth Dropper Seatpost31.6mm | 2000mm Left | 414mm | 150mm £200.00 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 Stem60mm | Grey  FREE i
Select
On-One Hot Box V2 Stem70mm | 7 Degree | 31.8mm £5.00 i
Select
El Guapo Stallion Stem50mm | Grey  FREE 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

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
Zefal Aluplast 124 Bottle CageWhite £3.99 i
Select
Zefal Spring Bottle CageWhite £3.99 i
Select
Planet X Alloy Bottle CageSIlver £3.99 i
Select
Zefal Aluplast 124 Bottle CageBlue £3.99 i
Select
Zefal Aluplast 124 Bottle CageYellow £3.99 i
Select
Planet X Alloy Bottle CageBlack £3.99 i
Select
Planet X Bi Plastic Bottle CageBlack £4.99 i
Select
Zefal Aluplast 122 Bottle CageRed £4.99 i
Select
Zefal Aluplast 122 Bottle CageWhite £4.99 i
Select
Planet X Ambi Plastic Bottle CageBlack £4.99 i
Select
Zefal Aluplast 122 Bottle CageBlue £4.99 i
Select
Zefal Aluplast 124 Bottle CageSilver £4.99 i
Select
Zefal Spring Bottle CageBlack £4.99 i
Select
Zefal Aluplast 122 Bottle CageTi-Grey £4.99 i
Select
Zefal Aluplast 122 Bottle CageBlack £4.99 i
Select
Planet X Nightwolf Plastic Bottle CageBlack £4.99 i
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Zefal Aluplast 122 Bottle CageSilver £4.99 i
Select
Zefal Aluplast 124 Bottle CageBlack £4.99 i
Select
Planet X Fang Plastic Bottle CageBlack £5.99 i
Select
Selcof Carbon BottlecageBlack and Silver £10.00 i
Select
Planet X SL Carbon CageGloss UD Black £10.00 i
Select
Planet X SL Carbon CageGloss 3K Black £10.00 i
Select
Zefal Pulse B2 Bottle CageWhite £12.99 i
Select
Zefal Pulse B2 Bottle CageNeon Yellow £12.99 i
Select
Zefal Pulse B2 Bottle CageBlue £12.99 i
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Zefal Pulse B2 Bottle CageRed £12.99 i
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Zefal Pulse B2 Bottle CageGrey £12.99 i
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Zefal Pulse B2 Bottle CageBlack £12.99 i
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Zefal Pulse B2 Bottle CagePink £12.99 i
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Zefal Pulse B2 Bottle CageGreen £12.99 i
Select
Zefal Pulse B2 Bottle CageOrange £12.99 i
Select
Zefal Pulse B2 Bottle CageCyan Blue £12.99 i
Select
Planet X Stainless Steel Bottle CageBrushed £14.99 i
Select
Planet X SL Carbon CageMatte 3K Black £14.99 i
Select
Zefal Pulse L2 Bottle CageBlack £16.99 i
Select
Planet X Pro Carbon Bottle CageBlack | Matt £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
Exustar 87x94 Flat PedalSilver £9.99 i
Select
VP-531 Aluminium Flat Platform PedalsBlack £24.99 i
Select
Superstar El Plastique Flat PedalWhite £24.99 i
Select
Jobsworth SPD Compatible Pedals Black With Cleat £24.99 i
Select
El Guapo Toro Flat PedalBlack £29.99 i
Select
M-Wave MTB Clipless Pedals £29.99 i
Select
Barbieri Shimano SPD MTB PedalsBlack £30.99 i
Select
Exustar E-PM86 MTB Single Sided SPD/Platform Pedals With Sealed BearingBlack £39.99 i
Select
Barbieri Shimano Compatible MTB PedalsBlack/Silver £43.49 i
Select
RSP Engage MTB DH/Trail PedalsBlack £49.99 i
Select
Exustar E-PB525 Flat PedalBlack £59.99 i
Select
Exustar Light Flat PedalBlack £69.99 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

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