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Brother Cycles Big Bro Frameset

Finance options available with:

Availability & Ordering
We list all framesets currently available from Brother Cycles as “in stock.” While we have a few on hand, most orders will be fulfilled via special order with approximately 14-day delivery.

To confirm ETA or any other questions, get in touch:
shop@bicyclejunction.co.nz | 04 385 2362

Brother Cycles Big Bro Frameset

Tough, versatile, and up for anything.

The Big Bro is Brother’s go-anywhere, carry-everything, ride-forever adventure frame. Whether you're strapping on lightweight bikepacking gear, loading up front and rear panniers for a world tour, or keeping it simple for weekend trail thrashing—the Big Bro is built to handle it.

Constructed from ED-coated 4130 chromoly steel and paired with a 100mm suspension-corrected steel fork, the Big Bro is tested and trusted on everything from the Scottish Highlands to the Silk Road Mountain Race.

Now with Boost spacing, it fits 27.5 x 3.0” or 29 x 2.6” tyres. Add in stealth dropper routing, triple mounts galore, sliding dropouts, and Rohloff compatibility—and you’ve got one seriously capable rig.

Frame Features

  • Material: 4130 double-butted chromoly steel (ED coated)

  • Fork: Chromoly unicrown fork, suspension-corrected (ED coated)

  • Tyre Clearance: Up to 29 x 2.6” or 27.5 x 3.0”

  • Dropouts: Sliding Boost 12x148mm (included) – geared or singlespeed

  • Rohloff compatible: Optional dropout set available

  • Brake Mounts: IS 51mm, 180mm max rotor

  • Bottom Bracket: 73mm ISO threaded

  • Seatpost Diameter: 30.9mm

  • Seat Clamp: 33.1mm (included)

  • Front Derailleur: 34.9mm high direct mount (adapter required)

  • Headset: 44mm ZS44/EC44 (not included)

  • Cable Routing: Full-length for brakes and derailleurs

  • Mounts:

    • 3x bottle cage (including under downtube)

    • Triple mounts on fork legs

    • Rear rack and fender mounts

Chainring Clearance

  • 1x: up to 38t

  • 2x: up to 44/30t

  • 3x: up to 48/36/26t

Weight

  • Frame (M/18"): 2.60kg

  • Fork (uncut, 300mm steerer): 1.37kg

Adventure-tested and expedition-approved.
From backcountry escapes to continent-crossing endurance rides, the Big Bro is the steel workhorse that keeps going—no matter what.

About Us

Though we’re a bike shop that sells, builds and fixes bicycles, they’re really just the means to an end; albeit a beautifully designed means to an idyllic end. Our job most importantly is to encourage as many people as we can to get out and ride for transport and enjoyment. We'd love to make riding a bike as commonplace as your morning cup of coffee, which by the way is our other obsession.

Contact Us

Bicycle Junction is situated at 1 Marion St, Te Aro, Wellington.

Call us on (04) 385 2362 OR send us a message.