The Stroma is a versatile, year-round road bike suited to the ever-changing weather and road surfaces of the UK. It's a fast all-road and gravel endurance bike. However you want to classify it, the Stroma is a highly capable machine - designed to be fast, responsive and supremely comfortable over the distance, no matter how bumpy the road gets.
The Stroma really lives up to its namesake: a remote island off the rugged north-east coast of Scotland, plagued by wild weather and nearly impenetrable tides.
The frame is made from Reynolds 725 steel; a heat-treated tube known for its strength and weight-saving properties, making it an ideal material for the challenges of year-round road cycling. The Brother full carbon road fork gives you a light and responsive front end with optimal power transfer - this has also been updated for 2025 and now includes internal dynamo routing - further improving the Stroma's endurance characteristics. The frame and fork have eyelets for full mudguards and can accommodate tires up to 38mm or 32mm with mudguards.
Other features include flat-mount thru-axle dropouts, replaceable dropout inserts, 2 bottle cage and rack mounts, and Di2 routing - which is also suitable as an internal guide for a dynamo rear light.
- Frame: Main frame made of Reynolds 725, heat treated, double butted, ED coated for rust protection, rear frame triangle made of Reynolds 500/520
- Brake mount: Flat Mount, 160mm max
- Rear installation width: 12x142mm thru axle (incl.)
- Seat post diameter: 27.2mm
- Seat clamp diameter: 30mm (incl.)
- Head tube: 44mm, ZS44/28.6 upper, EC44/40 lower (headset not included!)
- Front derailleur clamp diameter: 28.6mm
- Terracotta bearing thread: 68mm BSA
- Maximum tire clearance: 700c x 35mm (30mm with mudguards)
- Fork: 1.5" – 1.1/8" tapered full carbon fork with 12x100mm thru axle (incl.)
- Di2 cable ports
- 2x bottle holder eyelets
- Mudguard eyelets front and rear
- Luggage rack mount rear
- Chainring clearance: 53-39 double
- Frame weight: (medium): 1.97 kg
- Fork weight: (uncut steerer): 0.5 kg
Product safety information
Manufacturer information:
Brother Cycles
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| Größe /Size |
XS |
S |
M |
L |
XL |
| Sitzrohr /Seat Tube (C-T) |
500 mm |
520 mm |
540 mm |
560 mm |
580 mm |
| Oberrohr /Top Tube (C-C) |
510 mm |
526 mm |
542 mm |
557 mm |
572 mm |
| Oberrohr effektiv /Top Tube (Effective) |
522 mm |
540 mm |
557 mm |
572 mm |
587 mm |
| Steuerrohr / Head Tube |
110 mm |
125 mm |
140 mm |
160 mm |
180 mm |
| Steuerrohrwinkel / Head Angle |
71° |
72° |
72.5° |
72.5° |
72.5° |
| Sitzwinkel/ Seat Angle |
74° |
73.5° |
73° |
73° |
73° |
| BB Drop |
70 mm |
70 mm |
70 mm |
70 mm |
70 mm |
| Kettenstreben / Chainstay |
420 mm |
420 mm |
420 mm |
420 mm |
420 mm |
| Gabellänge / Fork Length (A-C) |
381 mm |
381 mm |
381 mm |
381 mm |
381 mm |
| Fork Rake |
45 mm |
45 mm |
45 mm |
45 mm |
45 mm |
| Stack |
532 mm |
550 mm |
563 mm |
585 mm |
604 mm |
| Reach |
369 mm |
377 mm |
385 mm |
393 mm |
402 mm |
| Radstand /Wheelbase |
990 mm |
995 mm |
1002 mm |
1017 mm |
1032 mm |
