CBOOBDGX
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 guarantee all day comfortable control.
Full description and spec
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 35 GOLD RL Debonair 130mm Fork - Featuring the highly tuneable Debonair spring, these forks offer a coil-like consistent feel throughout the travel, meeting the demands of modern trail riding head on fitting the Big Dog's boisterous attitude perfectly.
GX Eagle is the performance/price sweet spot in SRAM's MTB range.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. Super broad, forged crank arms with DUB axle power up climbs and laugh off big landings. SRAM Guide R hydraulic disc brakes for impeccable all weather control.
29er wheels roll smoother and faster however rough it gets. Tough, wide, tubeless ready WTB rims provide utmost durability at a reasonable weight. Proven on the toughest tracks of the Enduro World Series, depended on for daily trail rides, and trusted whilst bikepacking in remote regions of the world, the WTB I30 rims are a great fit for every usage and style of riding. 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.
Please Note: - Bike Specifications can and do change from time to time from the specification pictured above. Please check the Full bike specification cartefully before ordering
Upgrade prices - All of our customise and upgrade options are priced as upgrades. For example if you upgrade your Tyres or Handlebars we will swap them over for you. As the Upgrades are discounted we do not send out the original item as well as the upgrades
| 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 |
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.
| 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 |
| I | Stack (mm) | 609 | 619 | 628 | 641 |
| J | Reach (mm) | 415 | 446 | 460 | 480 |
| K | Front Centre (mm) | 725 | 762 | 779 | 807 |
| M | Fork Offset (mm) | 51 | 51 | 51 | 51 |
| O | Wheelbase (mm) | 1169 | 1206 | 1223 | 1251 |
| P | Standover (mm) | X | X | X | X |
Custom options available on components showing this spanner
| Brake Setup | UK Brake Lever Setup Rear Brake Left | ||
| Grips | On-One Knurl EVO Grip / Black | ||
| Handlebar | On-One Enduro6 Riser Handlebar / 780mm | ||
| 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 / 50mm / 7 Degree / 31.8mm | ||
| Chain | SRAM SX Eagle 12 Speed Chain / 126 Link | ||
| Gear Levers | SRAM GX Eagle Trigger Shifter (Lunar Colourway) / 12 Speed / Right Hand | ||
| Crank Set | SRAM GX Eagle DUB Crankset (Lunar Colourway) / 170mm / 32T / BOOST | ||
| Brake | SRAM Guide G2 R Hydraulic Disc Brake / Rear / 1800 / 20 Post to IS | ||
| Brake | SRAM Guide G2 R Hydraulic Disc Brake / Front / 900mm / Post mount (20mm bracket) 20P | ||
| Rear Mech | SRAM GX Eagle Rear Mech (Lunar Colourway) / 1 x 12 Speed | ||
| Wheels Built | WTB I30 29er Wheelset / Continental Ruban 29" 2.3 / SRAM PG1210 Cassette 11-50T / Avid Centreline Rotor 180mm Front/160mm Rear | ||
| Fork | RockShox 35 Gold RL DebonAir 29" BOOST Fork / 130mm / 15x110mm / Gloss Black / Crown Adjust |
| Frame Material | 4130 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 Type | NA |
| Wheels | 29" or 650B |
| Max Tyre | 2.35" (29) 2.6" (650b) |
| Mudguard mounts | NA |
| Rack Mounts | REAR |
| Bottle Cage Bosses | 1 |
| Brake Type | Chainstay Mount |
| Bottom Bracket | 73mm BSA |
| Headset Type | 44mm |
| Fork Length (mm) | TBD |
| Cable Routing | EXT |
| Dropper Compatible Max Chainring Max Rear Rotor | Yes, Stealth 32t 160mm |
| 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 |
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.
Build your bike in 3 simple steps
Rated 4.3 By You on Trustpilot
I love it! It's been a couple of months since new bike day and I've put in a few miles on the South Downs Way since. After dusting off the old aluminium 2012 MTB during lockdown it soon became clear that an update was required. I had a hankering to go back to steel, so after quite a bit of web surfing I happened across the On One Big Dog. A great looking bike with modern geometry and a great spec for the price. So I took the plunge and I can honestly say it was a great decision. The frame is supple and forgiving while giving plenty of feed back and is fast on the flat and a rocket down hill! All the feel you would expect from a great steel frame. I found that my old alu frame seemed to suck the momentum out me if you hit even the smallest rock on the trail, not with the Big Dog, it eats up the trail. I've taken it to Rogate bike park and it's more than happy over the table tops and drop offs. The Rockshox 35 fork is sublime, I used the Trailhead app to set it up and it's been a dream, more than capable. The SRAM GX groupset is great and for the price of the bike a real plus. The Guide brakes are some serious stoppers too. My only issue is the Clarks rotors, they give an uneven, juddery pulsing when braking which is annoying. I specced the Reverb dropper post and after a few teething troubles that's been good as well. All in all I would say this is a really good bike for a really good price and I would highly recommend it.