Brother Cycles Stroma all-road bike frame kit

The Stroma is a road bike frame made from Reynolds 725 steel for all seasons, it is a versatile frame, adapted to changing weather conditions and varied road surfaces. This bike is fast, responsive and above all, fun to ride. We designed it to accommodate high-volume road tires, meaning you won't need a different bike for each season.

The Stroma lives up to its name; it's a remote island off the north-east coast of Scotland, battered by fierce weather and almost impenetrable tides.

The Stroma is made from Reynolds 725 steel ; a heat-treated tube renowned for its strength and weight-saving properties, an ideal material for the challenges posed by year-round road cycling. We've paired it with the Brother full carbon road fork , giving you a light and responsive front end with optimal power transfer. The frame and fork feature mudguard eyelets and clearance for tires up to 35mm , or 30mm with mudguards.

Other features include thru-axle dropouts with flat mount, replaceable dropout inserts, 2 bottle cage mounts and rear rack mounts , and Di2 cable routing .

Technical characteristics :

• Frame Tubes: Reynolds 725 chromoly heat treated, double butted main triangle, ED coated. Reynolds 520/500 custom formed rear triangle.
• Brake Compatibility: Flat Mount, Maximum Rotor Size 160mm
• Rear dropouts: 12x142 mm TA (included)
• Seat tube diameter: 27.2 mm
• Seat clamp diameter: 30 mm (inclusive)
• Headset: 44mm, ZS44/28.6 upper, EC44/40 lower (not included)
• Front derailleur clamp diameter: 28.6 mm
• Bottom bracket: 68mm, ISO thread
• Maximum tire clearance: up to 700c x 35mm (30mm with mudguard)
• Fork: 1.5″ – 1.1/8″ tapered steerer carbon monocoque fork, mudguard mounts. 12x100 mm TA (included)
• 2 sets of bottle cage mounts on all sizes
• Rear rack and fender mounts
• Di2 cable passages
• Deck clearance: up to 53-39t double, 50t single
• Frame weight (medium size): 1.97 kg
• Fork weight (uncut pivot): 0.50 kg