Brother Cycles Big Bro 1x12

Lightweight, sturdy and perfect for long rides: your bespoke Big Bro fitted with a SON dynamo, an extremely durable DT Swiss Hybrid wheel and the most efficient Marathon tyres for maximum range and comfort.

Sizes: S (2026) black

The Brother Cycles Big Bro 2027 is a versatile, extremely robust 29er/27.5+ adventure frame, designed for demanding bikepacking tours, off-road adventures and long journeys far off the beaten track.
Whether with a lightweight bikepacking setup, fully loaded front and rear racks for a round-the-world trip, or a minimalist setup for fast forest and gravel trails – the Big Bro reliably masters every challenge.

New colours for 2027

• Light blue
• Khaki brown

The branding has been updated, whilst the technical specifications remain unchanged – proven quality, maximum load-bearing capacity and the typical Brother Cycles durability. 👍

The photo is for illustrative purposes only; we’ll upload the latest images as soon as we receive them.

PRE-ORDER: new colours, delivery November/December 2026

Specifications – Brother Cycles Big Bro

Complete bike with luggage rack, excluding accessories – built to your specifications

Frame

Brother Cycles Big Bro
Steel frame for adventure/bikepacking, compatible with 27.5" and 29" wheels. Ideal for long tours, luggage, hub dynamos, wide tyres and high stability.

Cockpit & Contact Points

• Stem: Procraft 6°, 60–70 mm
• Headset: Ritchey Comp
• Handlebar: Ergotec M-Bar M, 31.8 mm

The Ergotec M-Bar offers a relaxed, ergonomic hand position
great control and noticeably greater comfort on long rides.

• Grips: SQlab 702 2.0
• These grips are ideal for long rides and relaxed trekking.
  
• Saddle: SQlab MTB / Gravel

The SQlab 602 Ergolux active 2.1 is a particularly comfortable trekking saddle for long rides and a slightly upright riding position.

• Seatpost: Procraft 30.6 × 400 mm

→Comfortable, sturdy and reliable components for long tours and bikepacking.

Brakes

• Shimano SLX M7120 – 4-piston
• Brake discs 180 / 180 mm
  → High braking power and reliability, even when loaded with luggage and on long descents

Drivetrain 1×12

• Crankset: SRAM GX, 170 mm, 32 teeth
• Cassette: 11–51
• Shift lever: SRAM GX
• Rear derailleur: SRAM GX
  → very low gear ratio for steep climbs with luggage

Wheels

• Rim: DT Swiss M 502, 27.5", 30 mm
• Hub: SON hub dynamo (15×110 Boost)
  → maximum reliability, perfect lighting without a battery

Rear wheel

• DT Swiss HX 1700 Spline Hybrid, 27.5", 30 mm
• Boost 12×148
  → extremely sturdy, designed for heavy loads (hybrid/e-MTB standard) → ideal for bikepacking and expeditions

Tyres

Schwalbe Marathon Efficiency 27.5" x 2.35

• Very low rolling resistance
• ADDIX Race rubber compound
• Super Race carcass
  → ideal for long distances, fast tarmac and gravel sections

or

Vittoria Mezcal 27.5 × 2.35

• for those wanting more grip off-road
• often rides on forest tracks, trails, over roots and loose stones
• is looking for a versatile MTB tyre
• prioritises comfort and traction over speed

Advantages:

• very good grip
• high traction when climbing
• stable in corners
• robust and tubeless-compatible

Accessories: NG Sports Masalah luggage rack, HR, 26–29–4.0", folding mechanism (included in price) (here)
Light: Optional

Pedals: Optional

USB port: USB port, b&m option
Stable 5V output for USB devices

_------------------------------------_

The new Brother Cycles Big Bro is a comfortable, stable and highly versatile adventure/bikepacking bike, perfect for long tours, mountain rides and trips with luggage.
The build combines very light mountain gearing, powerful 4-piston brakes, high-quality wheels and comfortable contact points.

The front wheel, fitted with a SON hub dynamo, provides reliable lighting without the need for a battery, whilst the extremely sturdy DT Swiss HX 1700 Hybrid rear wheel offers maximum safety under heavy loads.
The Schwalbe Marathon Efficiency tyres roll particularly smoothly and are ideal for long distances on tarmac and gravel.

All in all, you get a very reliable, comfortable and travel-ready complete bike that performs well on both long tours and in everyday use.