Brother Cycles Kepler Frameset 2026

The Kepler has been a stalwart in our lineup for over decade and has undergone many updates to make to make it the stylish and versatile product it is today. The much-loved Kepler geometry remains the same, however, we’ve made functional and cosmetic changes to bring the product in-line with what we’re looking for from a functional steel frame such as the Kepler. Recent updates include:

- Lugged steel fork with dynamo routing and triple mounts
- Internal cable routing for rear brake
- Brazed seat collar
- 3 x bottle mount positions
- Oak Leaf metal head badge
- Updated hand-drawn branding for 2026

The Kepler can run either 700c or 650b wheels and has clearance for 700c x 45 or 650b x 48 tyres to keep you stable when the going gets tough. The frame is constructed from double butted 4130 chromoly steel, a functional tubing which provides the perfect balance of comfort and durability and we've applied an ED coating under the paint to protect against corrosion. It’s fully equipped to fit front and rear racks, mudguards and has three bottle mount positions if you’re loading up for a longer trip. To add to its bikepacking credentials the Kepler features triple cage mounts on each fork blade.

In the 10 years since it’s launch, we’ve sent Keplers to every corner of the globe, from the Australian outback to the hills of California, up to the Highlands of Scotland and along the coastal trails of Dorset. Whether taking part in a multi-day bikepacking race or simply tackling the daily commute, the Kepler gets you there in style and with a smile on your face.

Features

Tubing: 4130 Chromoly steel - double-butted main triangle, ED coated
Brake compatibility: flat mount, 160mm max rotor size
Rear Dropouts: 12x142mm TA (included)
Seat post diameter: 27.2mm
Headset: 1 1/8˝ threadless steerer/headset (not included)
Front derailleur clamp diameter: 28.6 mm
Chainring clearance: up to 52-39-30t triple, 50-34t double, 48t single
Bottom bracket shell: 68mm bottom bracket - ISO threaded
Tyre clearance: up to 700x45c or 650x48c
Fork: 4130 Chromoly lugged fork - 300mm steerer, 12x100mm TA (included)
Frame weight: 56cm = 2.25kg
Fork (with uncut steerer): 1.2kg
Tested to ISO 4210 standard