Big Bro

£499.00 £374.25

The Big Bro has been designed with versatility in mind, as after all, no two adventures are the same. So 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 cro-mo tubing and comes with 80mm suspension corrected forks – spacing easily allows up to 2.4 inch tyres for when the going gets tough. It features 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. Both the fork and frame also allow the use of a fender and pannier rack. S-bend chainstays with replaceable alloy sliding dropouts allow for geared or singlespeed setups.

Like all Brother products the Big Bro was rigorously tested. We took prototypes across the South Downs, through Snowdonia National Park and up to the Scottish Highlands. Most impressively a Big Bro also completed the 2016 Tour Divide – a 2,700 mile mountain bike race from Canada to New Mexico.

Features

Frame Specs

FAQs

Features

Tubing: - 4130 Chromoly steel - double-butted main triangle
Brake compatibility; 51mm IS disc brake mount, 180mm max rotor size
Dropouts: Vertical, 135mm O.L.D sliding dropouts
Seat post diameter: 27.2mm
Seat clamp diameter: 30mm
Headset: 1 1/8˝ threadless steerer/headset
Front derailleur clamp diameter: 28.6 mm
Bottom bracket shell: 73mm bottom bracket, ISO threaded
Maximum tyre clearance: 29" x 2.4"
Fork : 4130 Chromoly unicrown fork, disc only
Full-length cable housing guides for derailleurs and brakes
Chainring clearance: Triple 26/36/48t
Frame weight: 16" = 2.25kg
Fork weight: Uncut = 1.25kg

Big Bro technical drawing
SizeSmall (16)Medium (18)Large (20)xLarge (22)
Seat Tube (C-T)406mm457mm508mm559mm
Top Tube (C-C)554mm570mm590mm609mm
Top Tube (Effective)575mm595mm615mm630mm
Head Tube95mm100mm110mm125mm
Head Angle70.57171.571.5
Seat Angle73737373
BB Drop60mm60mm60mm60mm
Min Chainstay445mm445mm445mm445mm
Fork Length (A-C)468mm468mm468mm468mm
Fork Rake46mm46mm46mm46mm
Stack584mm591mm602mm617mm
Reach396mm414mm431mm442mm
Standover (mid top tube)776mm804mm834mm865mm

Are your frames guaranteed?

Our frames are fully guaranteed against manufacturing and materials faults or defects for 12 months 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 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.