Brother Cycles Stroma All-Road Frameset
Brother Cycles Stroma All-Road Frameset
- 4.9 from 782 Google reviews
- Independent Bike Dealer of the Year 2025, BikeBiz Awards
- UK delivery from £4.99, or free collection from our Bow shop at E3 3XS.
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A Reynolds 725 steel road frame for riding all year round, whatever the weather and the road surface.
The Stroma is named after a small island off the far north of Scotland, battered by weather and tides, and it is built for the same kind of punishment. Call it all-road, endurance or fast gravel: it is a quick, responsive road bike that stays comfortable over distance when the tarmac gets rough.
The main triangle is heat treated Reynolds 725, with a full carbon road fork up front to keep the steering sharp. Mudguard eyelets, rack mounts and dynamo routing mean you can ride it through a London winter and take it on an audax in the spring.
Why we chose this for our customers:
- Built for UK roads: fast and responsive, but with room for 38mm tyres when the lanes are broken up
- Year-round ready: full mudguard eyelets front and rear, still clears 32mm tyres with guards fitted
- Light for steel: under 2kg for a medium frame, paired with a 500g carbon fork
- Dynamo friendly: internal routing in the fork, and the Di2 ports double as routing for a rear dynamo light
- Serviceable: threaded bottom bracket and replaceable dropout inserts
Specification
- Frame: Reynolds 725 heat treated chromoly main triangle, Reynolds 520/500 rear triangle, ED coated
- Fork: full carbon, 1 1/8 to 1.5 inch tapered, mudguard mounts, internal dynamo routing, 12x100mm thru axle included
- Rear: 12x142mm thru axle included, replaceable dropout inserts
- Brakes: flat mount disc, 160mm max rotor
- Tyre clearance: 700c x 38mm, or 32mm with full mudguards
- Seatpost: 27.2mm, 30mm seat clamp included
- Headset: ZS44/28.6 upper, EC44/40 lower (not included)
- Bottom bracket: 68mm ISO threaded
- Chainrings: up to 53-39t double, 50t single
- Two bottle mounts, rear rack and mudguard mounts, Di2 ports
- Weight: 1.97kg frame (medium), 0.50kg fork uncut
- Three year frame guarantee from Brother Cycles
Geometry
| Size | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Seat tube (C-T) | 500 | 520 | 540 | 560 | 580 |
| Effective top tube | 522 | 540 | 557 | 572 | 587 |
| Head tube | 110 | 125 | 140 | 160 | 180 |
| Head angle | 71 | 72 | 72.5 | 72.5 | 72.5 |
| Seat angle | 74 | 73.5 | 73 | 73 | 73 |
| Chainstay | 420 | 420 | 420 | 420 | 420 |
| Stack | 532 | 550 | 563 | 585 | 604 |
| Reach | 369 | 377 | 385 | 393 | 402 |
| Wheelbase | 990 | 995 | 1002 | 1017 | 1032 |
All measurements in mm and degrees.
Ideal for: road riders who want one bike for winter training, sportives, audax and fast weekend rides.
Brother design their frames in London and we build them up on the bench in Bow, a few miles across East London. Bring us a parts list, a pile of components you already own, or just an idea, and we will spec, build and fit it for you. See the full Brother Cycles range, our other framesets, or book a build through our workshop.