Update December 2021: We have 1 large black left in stock as a fully built bike (pictured above), and then that’s it for a while! The spec is:
– Big Bro, Large, Black
– Alex Rims x Chosen 29″ wheels – qualit selaed bearing hubs, 30mm wide rims – perfect
– Shimano Deore 1 x 10 Groupset
– Deda Finising kit
– Schwalbe Smart Sam 29 x 2.6 tan wall tyres. Teravail 29 x 2.6 available instead if you prefer
– Madison Flux saddle and lock on grips
Our all purpose, tough as nails 29er/27.5+ adventure frame; designed to take you well off the beaten track and beyond. Whether you’re running a lightweight bikepacking setup, stripped back to thrash some forest trails or even front and rear panniers for a ’round-the-world’ tour the Big Bro can handle it.
The frame is made out of tough 4130 double butted cro-mo tubing and comes with a 100mm suspension corrected fork, both with corrosion resistant ED coating applied. There’s clearance for big 29 x 2.4″ tyres or up to 3 inch tyres if you’d prefer to go 27.5+. It features stealth dropper routing, rack mounts, bottle mounts on the seat tube, down tube and under the down tube for an extra bottle or storage. The forks also feature triple bottle mounts to fit further bottle cages or Anything Cages. S-bend chainstays with replaceable alloy thru axle sliding dropouts allow for geared or singlespeed setups.
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.
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 (included)
Seat post diameter: 30.9mm
Seat clamp diameter: 33.1mm (included)
Headset: 44mm, SHIS ZS44/28.6 upper, EC44/40 lower (not included)
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 2.4", 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 (included)
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 2.60kg, 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|
|Fork Length (A-C)||483mm||483mm||483mm||483mm|
|Standover (mid top tube)||782mm||810mm||840mm||871mm|
Are your frames guaranteed?
Brother frames bought through authorised dealers (that's us!) 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. Brother 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.
Where are Brother frames made?
Brother 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,frames are carefully designed in London and are exclusive to Brother Cycles.
Can you build me a custom bike?
Yes! Get in touch to discuss build specs with our team of qualified mechanics