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Loose Cycles

Brother Cycles Kepler Frameset


The Kepler has been a stalwart in the Brother lineup for 6 years now and keeps going strong into 2021. It was designed with versatility in mind, it’s a gravel grinder, super commuter, galactic tourer… ready to tackle whatever you throw at it. So if you need a bike that’s as happy on the daily commute as it is on a weekend bikepacking trip, look no further than the Kepler.

The Kepler can run either 700c or 650b wheels and has clearance for 700x45c or 650x48c 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. For 2021 the new Kepler now features flat mount thru axle dropouts with a replaceable derailleur hanger, s-shaped chainstays and a unicrown steel fork.


  • 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
  • Seat clamp diameter: 30mm (included)
  • 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 unicrown fork - 300mm steerer, 12x100mm TA (included)
  • Frame weight: 56cm = 2.25kg
  • Fork (with uncut steerer): 1.19kg
  • Tested to ISO 4210 standard

You can find more information about the Kepler HERE