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Brother Cycles Big Bro 2025 Swamp Thing - Frameset
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The Big Bro is a frame designed for tough adventures, for those who take bikepacking seriously. Made from CrMo steel to survive multiple trips around the world. This model has completed two of the world’s toughest endurance races - the 441.8-mile Tour Divide from Canada to Mexico and the 171-mile Silk Road Mountain Race in Kyrgyzstan.
New for 2025, the Big Bro is now an even more capable adventure frame - heat-treated 4130 CrMo main triangle, a new sliding dropout configuration for a stronger and more reliable rear end, UDH full-mount-compatible derailleur hanger, top tube mounts, and additional front rack mounts.
The frame is now made from extra-durable, heat-treated 4130 double-butted cro-mo tubing and comes with a 100 mm suspension-corrected fork, both with corrosion-resistant ED coating. The Big Bro has Boost spacing, which means there’s room for large 27.5 x 3″ tires or 29 x 2.6″ tires if you prefer a 29-inch setup. It has internal dropper routing, multiple rack and bag mounts, a bottle mount on the seat tube, and triple mounts on and under the down tube for extra bottles and storage. The Big Bro fork also has triple mounts for additional bottle cages or Anything Cages.
The rear triangle has S-bent chainstays with replaceable aluminum thru-axles for geared or singlespeed setups. These were redesigned for 2025 and now feature a rail system for extra strength and reliability.
We’re pleased that Brother Cycles has made a frame with Boost spacing that you can ride geared or single speed! You can also choose between 27.5" and 29" tires, depending on the terrain the bike needs to handle.
From experience, we can tell you that a maximum tire volume of 3" requires a single chainring up front; with a double, the chain will rub against the tire.
New for 2025, the Big Bro is now an even more capable adventure frame - heat-treated 4130 CrMo main triangle, a new sliding dropout configuration for a stronger and more reliable rear end, UDH full-mount-compatible derailleur hanger, top tube mounts, and additional front rack mounts.
The frame is now made from extra-durable, heat-treated 4130 double-butted cro-mo tubing and comes with a 100 mm suspension-corrected fork, both with corrosion-resistant ED coating. The Big Bro has Boost spacing, which means there’s room for large 27.5 x 3″ tires or 29 x 2.6″ tires if you prefer a 29-inch setup. It has internal dropper routing, multiple rack and bag mounts, a bottle mount on the seat tube, and triple mounts on and under the down tube for extra bottles and storage. The Big Bro fork also has triple mounts for additional bottle cages or Anything Cages.
The rear triangle has S-bent chainstays with replaceable aluminum thru-axles for geared or singlespeed setups. These were redesigned for 2025 and now feature a rail system for extra strength and reliability.
We’re pleased that Brother Cycles has made a frame with Boost spacing that you can ride geared or single speed! You can also choose between 27.5" and 29" tires, depending on the terrain the bike needs to handle.
From experience, we can tell you that a maximum tire volume of 3" requires a single chainring up front; with a double, the chain will rub against the tire.
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