Preorder: We’ve been out of stock of Stromas, particularly in certain sizes, for quite some time and we know there are plenty of customers waiting to get hold of one! So here is your possibility to secure one while making a good preorder deal! Frames are expected to arrive here middle to end of September.
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 Ltd,
Brogdale Farm, Brogdale Rd
Faversham, Vereinigtes Königreich, ME13 8XZ
info@brothercycles.com
https://www.brothercycles.com
| 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 |