Brother Cycles Big Bro Frameset

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  • Regular price £725.00
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Brother Cycles' 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, front and rear panniers for a fully loaded ’round-the-world’ tour or just stripped back to thrash some forest trails the Big Bro can handle it.

As of January 2023 Brother offer a Rohloff specific dropout set (available to purchase as an extra) which makes the Big Bro compatible with the Rohloff 135mm Speedhub with OEM axle plate. Please email us if you have any questions about this.


Tubing: - 4130 Chromoly steel - double-butted main triangle, ED coated
Brake compatibility; 51mm IS disc brake mount, 180mm max rotor size
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)
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. 15x110mm Boost thru axle (included)
Full-length cable housing guides for derailleurs and brakes
3 sets bottle cage mounts on all sizes
Chainring clearance: 44-30t double, 38t single
Weight: Medium (18") Frame 2.60kg, Fork (300mm steerer) 1.37kg
Tested to ISO 4210 MTB standard

Want a Hope headset fitted? – 15% off Black Hope headset when purchased with a frame and fitted for free!