The Brother Cycles Stroma frame set is the ideal foundation for a customized and sporty bicycle build. The high-quality frame impresses with its modern design, balanced geometry, and agile handling. It’s perfect for anyone looking to configure their bike with premium components according to their own preferences.
The Stroma is Brother Cycles' versatile, year-round road bike designed for the unpredictable weather and road conditions found in the United Kingdom and beyond. Whether for all-road riding, fast gravel, or long distances, the Stroma offers speed, responsiveness, and comfort over long journeys, no matter how rough the terrain may become.
The Stroma is named after a remote island off the northeast coast of Scotland, known for its severe weather and nearly impassable tides.
The frame is made from Reynolds 725 steel—a heat-treated tubing material that offers an excellent balance of strength, weight, and ride quality, making it particularly suitable for a bike intended for year-round use. At the front, our full-carbon fork ensures a lightweight and responsive ride, with internal dynamo routing that further enhances the Stroma's long-distance capabilities.
There is room for tires up to 38 mm wide or 32 mm with full fenders, thanks to mounted eyelets on the frame and fork.
Additional features include thru-axles and flat-mount dropouts, interchangeable dropout inserts, two bottle cage mounting options, rack and fender mounts, and Di2 routing—serving also as compact internal routing for a dynamo rear light.
Details:
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Brand: Brother Cycles
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Product: "Stroma 2026" Frame Set
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Color/Version: Black
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Intended Use: Road/Gravel Bike
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Material (Frame/Fork): Reynolds 725 heat-treated ChrMo steel/Carbon
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Available Sizes: XS (50cm), S (52cm), M (54cm), L (56cm), or XL (58cm)
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Frame Weight (M): approx. 1.97 kg
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Fork Weight (uncut): 0.50 kg
Technical Features:
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Frame: Reynolds 725 heat-treated ChrMo steel, double-butted, ED-coated. Custom-shaped rear triangle made from Reynolds 520/500.
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Brake Compatibility: Flat Mount, max rotor size 160 mm
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Rear Dropouts: 12x142 mm TA (included)
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Seat Post Diameter: 27.2 mm
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Seat Clamp Diameter: 30 mm (included)
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Headset: 44 mm, ZS44/28.6 top, EC44/40 bottom (not included)
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Front Derailleur Clamp Diameter: 28.6 mm
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Bottom Bracket Shell: 68 mm bottom bracket, ISO thread
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Maximum Tire Clearance: up to 700C x 38 mm (32 mm with fenders)
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Fork: 1.5” – 1.1/8” tapered steerer, carbon monocoque disc fork, with fender mounts. 12x100 mm TA (included), dynamo routing
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2x bottle cage mounts in all sizes
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Rack and fender mounts
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Di2 cable outlets
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Chainring Clearance: up to 53-39t double, 50t single
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Frame Weight (M): 1.97 kg
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Fork Weight (without cut steerer): 0.50 kg
This frame set provides the foundation for your individual adventures, ensuring you can enjoy maximum riding pleasure and flexibility.
Product safety information
Manufacturer information:
Brother Cycles Limited
Brogdale Road Faversham
Kent, Vereinigtes Königreich, ME13 8XZ
info@brothercycles.com
https://www.brothercycles.com
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