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  Cleaners, Degreasers and Lubricationin Kyrgyzstan.

FEATURESTubeless

Tubing: - 4130 Chromoly steel - double-butted main triangle, ED coated
Brake compatibility; 51mm IS disc brake mount, 180mm max rotor sizeTools & Maintenance
Dropouts: Boost 12x148mm 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)Clothing and Protection
Front derailleur clamp diameter: 34.9 mm high direct-mount (adapter available separately)See More
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. 15x110mm Boost thru axle (included)
Full-length cable housing guides for derailleurs and brakesProjektRide Merchandise
3 sets bottle cage mounts on all sizes
Chainring clearance: 44-30t double, 38t single
Weight: medium (18") frame 2.60kg, fork (300mm steerer) 1.37kgHelmets
Tested to ISO 4210 MTB standard