The Brother Stroma is their new Reynolds 725 steel all-road frame – a versatile, year round road bike suited to the ever changing weather and road surfaces of the UK. The bike is fast, responsive and most importantly fun to ride and designed it to accommodate large volume road tyres meaning you won’t need a different bike for every season.
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.
The Stroma is 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. This is matched with the Brother full carbon road fork up front giving you a lightweight and responsive front end with optimum power transfer. The frame and fork have fitted eyelets for full mudguards and clearance for up to 33mm tyres or 30mm with mudguards
Other features include thru-axle flat-mount dropouts, replaceable dropout inserts, 2 x bottle cage and rear rack mounts, and Di2 routing.
Features
Frame tubing: Reynolds 725 heat treated chromoly double-butted main triangle, ED coated
Brake compatibility: flat mount, 160mm max rotor size
Rear Dropouts: 12x142mm TA (included)
Seat post diameter: 27.2mm
Seat clamp diameter: 30mm (included)
Headset: 44mm, ZS44/28.6 upper, EC44/40 lower (not included)
Front derailleur clamp diameter: 28.6mm
Bottom bracket shell: 68mm bottom bracket, ISO threaded
Maximum tyre clearance: up to 700c x 33mm (30mm with mudguards)
Fork: 1.5″ – 1.1/8″ tapered steerer carbon monocoque disc fork, mudguard mounts. 12x100mm TA (included)
2 sets bottle cage mounts on all sizes
Rear rack and mudguard mounts
Di2 cable ports
Chainring clearance: up to 53-39t double
Frame weight (medium): 2.0kg
Fork weight (uncut steerer): 0.5kg
| Size | xSmall | Small | Medium | Large | xLarge |
| Seat Tube (C-T) | 500mm | 520mm | 540mm | 560mm | 580mm |
| Top Tube (C-C) | 510mm | 526mm | 542mm | 557mm | 572mm |
| Top Tube (Effective) | 522mm | 540mm | 557mm | 572mm | 587mm |
| Head Tube | 110mm | 125mm | 140mm | 160mm | 180mm |
| Head Angle | 71 | 72 | 72.5 | 72.5 | 72.5 |
| Seat Angle | 74 | 73.5 | 73 | 73 | 73 |
| BB Drop | 70mm | 70mm | 70mm | 70mm | 70mm |
| Chainstay | 420mm | 420mm | 420mm | 420mm | 420mm |
| Fork Length (A-C) | 381mm | 381mm | 381mm | 381mm | 381mm |
| Fork Rake | 45mm | 45mm | 45mm | 45mm | 45mm |
| Stack | 532mm | 550m | 563mm | 585mm | 604mm |
| Reach | 369mm | 377mm | 385mm | 393mm | 402mm |
| Wheelbase | 990mm | 995mm | 1002mm | 1017mm | 1032mm |
FAQ
Are your frames guaranteed?
Brother frames bought through authorised dealers (that's us!) are fully guaranteed against manufacturing and materials faults or defects for a period of three years from date of purchase. This guarantee does not cover items which are damaged through accident, misuse, wear and tear, neglect or those which have been repaired or altered by any other firm. Paintwork is not covered by this warranty, nor is any damage that happens to you or your other components as a result of any failure of one of our products.
This guarantee is only valid to the original customer and is non-transferable. Brother reserve the right to an independent opinion on whether the goods qualify for a refund. A dated proof of purchase must be provided before a warranty claim will be considered.
Where are Brother frames made?
Brother frames are made in Taiwan. They are handmade using traditional brazing and welding techniques with the highest quality materials by a team of frame builders who have over 2 decades of experience. Each frame undergoes extensive quality and safety checks before it is shipped to us in the UK. Although built overseas,frames are carefully designed in London and are exclusive to Brother Cycles.
Can you build me a custom bike?
Yes! Get in touch to discuss build specs with our team of qualified mechanics
