Big Bro

£549.00 Inc VAT

(Price for non-EU customers £457.50)

The 2018 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 100mm suspension corrected forks. There’s now clearance for big 3 inch tyres on 27.5+ wheels or up to 2.4 inch tyres if you’d prefer a 29er. 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 first-generation 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 Quick Release dropouts (optional 12x142mm Thru Axle plates available separately)
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"
Fork : 4130 Chromoly tapered unicrown fork, disc only, 100mm suspension corrected
Full-length cable housing guides for derailleurs and brakes
3 sets bottle cage mounts on all sizes
Chainring clearance: up to double 42-28t, single 38t

Big Bro technical drawing
SizeSmall (16)Medium (18)Large (20)xLarge (22)
Seat Tube (C-T)406mm457mm508mm559mm
Top Tube (C-C)556mm571mm590mm607mm
Top Tube (Effective)575mm595mm615mm630mm
Head Tube95mm100mm110mm125mm
Head Angle69.57070.570.5
Seat Angle73737373
BB Drop60mm60mm60mm60mm
Min Chainstay445mm445mm445mm445mm
Fork Length (A-C)483mm483mm483mm483mm
Fork Rake46mm46mm46mm46mm
Stack598mm605mm616mm630mm
Reach392mm410mm427mm437mm
Standover (mid top tube)782mm810mm840mm871mm

Are your frames guaranteed?

Our frames and bikes 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.