BROTHER STROMA
Highly Refined All-Season Road Bike
The Brother Stroma is Brother Cycles’ latest Reynolds 725 steel all-season road frame – a versatile, year round road bike suited to the ever changing weather and road conditions of the UK.
The Stroma is fast, responsive and most importantly fun to ride. And it has been designed it to accommodate large volume road tyres; meaning you won’t need a different bike for every season or even for every type of road surface.
New Colour for 2026-7: Black
The Stroma truly lives up to its namesake; a remote island off the rough north east coast of Scotland, battered by ferocious weather and near impenetrable tides. Constructed out of Reynolds 725 steel; a heat treated tubing famed for its strength and weight saving properties and an ideal material for the challenges posed by year round road cycling. It is then ED electrocoated to prevent rust both inside and outside the frame tubing. Matched with the Brother full carbon road fork up front gives you a lightweight and responsive front end with optimum power transfer.
The frame and fork have proper eyelets for full mudguards and clearance for up to 38mm tyres or 32mm with mudguards in the latest version.
Other features include thru-axle flat-mount dropouts, replaceable dropout inserts, 2 x bottle cage and rear rack mounts, Di2 routing, and (new) internal dynamo routing. The frame is also compatible with ultra reliable British Standard bottom brackets, and has a deep hard-wearing powder coated finish, designed to cope with the worst of British weather. All in all we believe you will be hard pressed to find a more beautifully designed, engineered and finished bike for taking on whatever type of ‘road’ you fancy…including those with nothing remotely resembling a properly paved surface!
Frame tubing: Reynolds 725 heat treated chromoly double-butted main triangle, ED coated. Reynolds 520/500 custom formed rear triangle.
Brake compatibility: flat mount, 160mm max rotor size
Rear Dropouts: 12x142mm TA
Seat post diameter: 27.2mm
Seat clamp diameter: 30mm
Headset: 44mm, ZS44/28.6 upper, EC44/40 lower
Front derailleur clamp diameter: 28.6mm
Bottom bracket shell: 68mm bottom bracket, ISO threaded
Maximum tyre clearance: up to 700c x 38mm (32mm with mudguards)
Fork: 1.5″ – 1.1/8″ tapered steerer carbon monocoque disc fork, mudguard mounts. 12x100mm TA
2 sets bottle cage mounts on all sizes
Rear rack and mudguard mounts
Di2 cable ports
Internal dynamo routing
Chainring clearance: up to 53-39t double
Frame weight (medium): 1.97kg
Fork weight (uncut steerer): 0.50kg
New Colour for 2026-7: Light Grey
The Brother Stroma comes to us as a frameset in new Black and Light Grey colourways, which can then be built up into a complete bike in our workshop using components of your choice. And with a huge variety of build options the Stroma can be tuned to suit any kind of road+ riding you like.
“This is the kind of modern steel road bike that will be just as happy attacking summertime road rides, as it will churning wet base miles with full-coverage fenders and fat tires all winter long.” BikeRumour
BROTHER STROMA
All Brother Stromas start out as a bare frameset initially, for building up into a complete bike with suitable components of your choice. Below is a sample custom build that we can offer ‘off the peg’ or use as a start point for further customisation.
Brother Stroma 105 12s – £2,549
Specification
FRAMESET: Brother Stroma Reynolds 725 frame, full carbon fork
HEADSET: M:Part
BOTTOM BRACKET: Shimano RS500
SHIFT/BRAKE LEVERS: Shimano 105, 12-speed
BRAKES: Shimano 105 Hydraulic Disc, RT64 160mm rotors
FRONT DERAILLEUR: Shimano 105 12s
REAR DERAILLEUR: Shimano 105 12s
CRANKSET: Shimano 105 50/34T
CASSETTE: Shimano 105 (choice of ratios)
CHAIN: Shimano 105, 12-speed
HANDLEBAR: PRO LT
STEM: PRO LT
SEATPOST: PRO LT
SADDLE: Fabric Scoop Sport Radius
WHEELS: New DT Swiss E 1800 Spline
TYRES: Continental Grand Prix TR – choice of widths
PEDALS: Half price pedals of your choice from leading brands, including Shimano, Look and Crank Brothers, available with every new bike order
COLOURS: Black or Light Grey
EXAMPLE WHEEL OPTIONS:
- Hope 20FIVE-Pro 5 – add £159
- Scope S4.A 45 carbon – add £449
- ZIPP 404 S – add £519
Brother Stroma 105 Di2 – £2,999
Specification
FRAMESET: Brother Stroma Reynolds 725 frame, full carbon fork, 100/142×12 thru-axles
HEADSET: M:Part
BOTTOM BRACKET: Shimano RS500
LEVERS: Shimano 105 Di2 12s hydraulic
BRAKES: Shimano 105 Di2 12s hydraulic disc, CL700 160mm rotors
FRONT DERAILLEUR: Shimano 105 Di2 12s
REAR DERAILLEUR: Shimano 105 Di2 12s
CRANKSET: Shimano Shimano 105 50/34T
CASSETTE: Shimano Shimano 105 11-34T or 11-36T
CHAIN: Shimano 105, 12-speed
HANDLEBAR: PRO LT
STEM: PRO LT
SEATPOST: PRO LT
SADDLE: Fabric Scoop Sport Radius
WHEELS: New DT Swiss E 1800 Spline
TYRES: Continental Grand Prix TR – choice of widths
PEDALS: Half price pedals of your choice from leading brands, including Shimano, Look and Crank Brothers, available with every new bike order
COLOURS: Black or Light Grey
EXAMPLE WHEEL OPTIONS:
- Hope 20FIVE-Pro 5 – add £159
- Scope S4.A 45 carbon – add £449
- ZIPP 404 S – add £519
Brother Stroma Ultegra Di2 – £3,529
Specification
FRAMESET: Brother Stroma Reynolds 725 frame, full carbon fork, 100/142×12 thru-axles
HEADSET: M:Part
BOTTOM BRACKET: Shimano RS500
SHIFT/BRAKE LEVERS: Shimano Ultegra Di2
BRAKES: Shimano Ultegra Hydraulic Disc, CL800 160mm rotors
FRONT DERAILLEUR: Shimano Ultegra Di2
REAR DERAILLEUR: Shimano Ultegra Di2 12-speed
CRANKSET: Shimano Ultegra 50/34T 12s
CASSETTE: Shimano Ultegra 11/34T
CHAIN: Shimano Ultegra, 12-speed
HANDLEBAR: PRO PLT Compact
STEM: PRO PLT
SEATPOST: PRO PLT
SADDLE: Ergon SR Allroad
WHEELS: Hope 20FIVE
TYRES: Continental Grand Prix TR – choice of widths
PEDALS: Half price pedals of your choice from leading brands, including Shimano, Look and Crank Brothers, available with every new bike order
COLOURS: Black or Light Grey
EXAMPLE WHEEL OPTIONS:
- New DT Swiss E 1800 Spline – deduct £159
- Scope S4.A 45 carbon – add £289
- ZIPP 404 S – add £359
Brother Stroma Rival AXS – £3,579
Specification
FRAMESET: Brother Stroma Reynolds 725 frame, full carbon fork, 100/142×12 thru-axles
HEADSET: M:Part
BOTTOM BRACKET: SRAM DUB
SHIFT/BRAKE LEVERS: SRAM Rival eTap AXS E1, 12-speed
BRAKES: SRAM Rival Hydraulic Disc, Paceline CL 160mm rotors
FRONT DERAILLEUR: SRAM Rival AXS E1
REAR DERAILLEUR: SRAM Rival AXS E1
CRANKSET: SRAM Rival AXS 12s (choice of 46/33T or 48/35T)
CASSETTE: SRAM Rival AXS 12s (choice of 10-30T or 10-36T)
CHAIN: SRAM Rival AXS
HANDLEBAR: PRO PLT Compact
STEM: PRO PLT
SEATPOST: PRO PLT
SADDLE: Ergon SR Allroad
WHEELS: Hope 20FIVE
TYRES: Continental Grand Prix TR – choice of widths
PEDALS: Half price pedals of your choice from leading brands, including Shimano, Look and Crank Brothers, available with every new bike order
COLOURS: Black or Light Grey
EXAMPLE WHEEL OPTIONS:
- New DT Swiss E 1800 Spline – deduct £159
- Scope S4.A 45 carbon – add £289
- ZIPP 404 S – add £359