Brother Cycles Big Bro 1x12

Versatile adventure frame for bikepacking, world tours and trails

Model 2025

Colour and sizes : black S,M,L,XL

Colour and sizes : green metallic S,M,L,XL

The Big Bro is a robust, versatile frame for 29 and 27.5 tyres, perfect for bikepacking adventures, long tours and demanding trails.

Specification : Modifications are possible

🛠️ Brother Cycles - Complete bike "A la Carte"

- Delivery time after order: approx. up to 20 days

- Gearing: Shimano Deore XT, 1x11-speed

🧱 Frame & fork

- Frame: 100 % Brother Cycles chromoly steel

- Fork: 100 % Brother Cycles chromoly steel

🔩 Components

- Headset: Ritchey Comp

- Brakes: Magura MT Trail Sport (optional)

- Brake lever: Magura MT Trail Sport

- Brake discs: 180 mm front / 160 mm rear

- Shift lever: Shimano Deore XT 11-speed

- Stem: Procraft 6°, 60-70 mm

- Handlebars: Ergotec M Bar M, 31.8 mm

- Grips: Black

- Saddle: SQlab MTB / Gravel

- Seatpost: Procraft, 30.9 × 400 mm

⚙️ Drivetrain

- Crankset: Shimano Deore, 32 teeth

- Bottom bracket: Shimano Hollowtech II

- Front derailleur: Not available

- Rear derailleur: Shimano Deore XT, 11-speed

- Cassette: Shimano Deore, 11-51 teeth

- Chain: Shimano HG

🛞 Wheels & tyres

- Rims: RYDE 622 × 30 mm (system weight up to 150 kg)

- Tyres: Schwalbe Marathon Efficiency 55-622

- Particularly low rolling resistance thanks to ADDIX Race rubber compound and Super Race carcass - ideal for long distances

- Front wheel hub: SON hub dynamo (optional)

📐 Frameset - Technical data

- Tubeset: 4130 heat-treated chromoly steel, double butted, ED-coated

- Brake mount: 51 mm IS disc mount, max. rotor size 180 mm

- Dropouts: Boost 12 × 148 mm thru axle (incl.)

- Derailleur hanger: SRAM UDH type, fully mountable

- Seatpost: 30.9 mm

- Seat clamp: 33.1 mm (incl.)

- Headset: 44 mm, SHIS ZS44/28.6 top, EC44/40 bottom (not included)

- Front derailleur mount: 34.9 mm, top-pull or high direct mount (adapter available separately)

- Bottom bracket shell: 73 mm ISO thread

- Tyre clearance: up to 29" × 2.6" or 27.5" × 3.0"

- Fork: 4130 chromoly, tapered, unicrown design, ED-coated, 15 × 110 mm

- Chainring compatibility: Triple (48-36-26t), Double (44-30t), Single (38t)

- Weight: Frame (size M/18") approx. 2.60 kg, fork (300 mm head tube) approx. 1.37 kg

- Standard: Tested according to ISO 4210 MTB standard