“Our all purpose, tough as nails, 29/27.5+ adventure bike – built to take you well off the beaten track and beyond.”
Big Bro Complete
£1,849.00 Inc VAT
SOLD OUT! Unfortunately we will not be offering the Big Bro as a complete bike in 2024. The spec below is for the 2019 model
Our all purpose, tough as nails, 29er adventure bike – built to take you well off the beaten track and beyond. Whether you’re running a lightweight bikepacking setup, front and rear panniers for a ’round-the-world’ tour or stripped back to thrash some forest trails the Big Bro can handle it.
The frame is made out of tough 4130 double butted cr-mo tubing with a 100mm suspension corrected fork, both with corrosion resistant ED coating applied. It comes equipped with the latest Sram NX Eagle 1×12 groupset – providing reliable shifting in the toughest of conditions. WTB Ranger 2.25″ tyres on WTB ST i25 29″ rims are a trail ready “bikepacker approved” wheelset that excels on longer rides. Last but not least the SRAM Level T hydro disc brakes give you confidence-boosting stopping power all day long.
Like all Brother products the Big Bro has been rigorously tested out in the real world – we took prototypes across the South Downs, through Snowdonia National Park and up to the Scottish Highlands. The Big Bro has since completed two of the worlds toughest bikepacking endurance races – the 4,418km Tour Divide from Canada to Mexico and the 1,710km Silk Road Mountain Race in Kyrgyzstan.
Build
Features
Frame Specs
FAQs
Drivetrain
Crankset: SRAM NX Eagle 30t
Bottom Bracket: SRAM DUB
Rear Derailleur: SRAM NX Eagle 1x12
Cassette: PG-1230 Eagle 11–50t, 12-speed
Chain: SRAM NX Eagle
Components
Headset: FSA Orbit ITA
Brakes/Rotors: SRAM Level T Hydro, front 180mm rear 160mm
Brake Levers: SRAM Level T
Shifters: SRAM NX Eagle
Stem: Promax DA-296 70mm
Handlebar: MJ 133EN 730mm
Saddle: WTB Volt Comp
Seatpost: Promax SP-2016
Wheels
Front Hub: Formula DC71 32h 100mm
Rear Hub: Formula DCL360 32h 142mm
Rims: WTB ST i25 TCS
Tires: WTB Ranger Comp 29x2.25
Weight
13.5kg (Medium)
Please note: Your bike will arrive 90% assembled. You will need to attach the pedals, front brake, front wheel, handlebars, seat and a few other minor parts as well as adjust, tighten and tune. It is possible to build with moderate bicycle knowledge, however we highly recommend that you have your bike put together and checked by a professional bike mechanic for safety and proper functioning. Shipping direct to your local bike store for assembly is possible.
Features
Tubing: - 4130 Chromoly steel - double-butted main triangle, ED coated
Brake compatibility; 51mm IS disc brake mount, 180mm max rotor size
Dropouts: 12x142mm thru axle
Seat post diameter: 30.9mm
Seat clamp diameter: 33.1mm
Headset: 44mm, SHIS ZS44/28.6 upper, EC44/40 lower
Front derailleur clamp diameter: 34.9 mm high direct-mount (adapter available separately)
Bottom bracket shell: 73mm bottom bracket, ISO threaded
Maximum tyre clearance: 29" x 2.6", 27.5" x 3.0" (note: not all drivetrains allow for these maximum tyre clearances)
Fork : 4130 Chromoly tapered unicrown fork, ED coated. 15x100mm thru axle
Full-length cable housing guides for derailleurs and brakes
3 sets bottle cage mounts on all sizes
Chainring clearance: up to 48-36-26t triple, 42-28t double, 38t single
Weight: medium (18") frame 2.6kg, fork (300mm steerer) 1.37kg
Tested to ISO 4210 MTB standard
| Frame Size | Small (16) | Medium (18) | Large (20) | xLarge (22) |
| Seat Tube (C-T) | 406mm | 457mm | 508mm | 559mm |
| Top Tube (C-C) | 556mm | 571mm | 595mm | 622mm |
| Top Tube (Effective) | 575mm | 595mm | 620mm | 645mm |
| Head Tube | 95mm | 100mm | 110mm | 125mm |
| Head Angle | 69.5 | 70 | 70.5 | 70.5 |
| Seat Angle | 73 | 73 | 73 | 73 |
| BB Drop | 60mm | 60mm | 60mm | 60mm |
| Min Chainstay | 445mm | 445mm | 445mm | 445mm |
| Fork Length (A-C) | 483mm | 483mm | 483mm | 483mm |
| Fork Rake | 46mm | 46mm | 46mm | 46mm |
| Stack | 598mm | 605mm | 616mm | 630mm |
| Reach | 392mm | 410mm | 432mm | 452mm |
| Standover (mid top tube) | 782mm | 810mm | 840mm | 871mm |
| Wheelbase | 1083mm | 1098mm | 1118mm | 1144mm |
Are your frames guaranteed?
Our frames are fully guaranteed against manufacturing and materials faults or defects for a period of three years from date of purchase. This guarantee does not cover items which are damaged through accident, misuse, wear and tear, neglect or those which have been repaired or altered by any other firm. Paintwork is not covered by this warranty, nor is any damage that happens to you or your other components as a result of any failure of one of our products.
This guarantee is only valid to the original customer and is non-transferable. We reserve the right to an independent opinion on whether the goods qualify for a refund. A dated proof of purchase must be provided before a warranty claim will be considered.
Can you build me a custom bike?
Sorry we don’t do custom builds, but you can contact one of our many stockists for assistance in building up a bike.
Where are your frames stocked?
You can see a list of shops where our frames are stocked here. If your LBS isn’t listed then ask them to get in touch with us about ordering a frame for you.
Where are your frames made?
Our frames are made in Taiwan. They are handmade using traditional brazing and welding techniques with the highest quality materials by a team of frame builders who have over 2 decades of experience. Each frame undergoes extensive quality and safety checks before it is shipped to us in the UK. Although built overseas our frames were carefully designed by us in London and are exclusive to Brother Cycles.