RockyMounts Fattie - Fat Bike Adapter

RockyMounts has come out with a Fat Bike adapter for their more and more popular BrassKnuckles Up-Right style bike rack. This easy to use adapter kit allows you to change out the smaller chock (for normal tire sizes) for a much fatter version. It only takes a couple of minutes to make the change and includes extenders for the wheel straps to fit the fatter tire size. This is really the only option for Fat bikes to be mounted on a roof mounted bike rack. Don't go on a diet, get the Fattie and ride the weight away!

Availability: In stock

Rocky Mounts



  • Transform your new RockyMounts BrassKnuckles bike rack to fit your Fat Bike
  • Includes a fatter wheel chock for your fat tires
  • Simple installation with easy to follow instructions
  • Includes 2 ratchet strap extenders for both the front and back fat tires
  • Only Up-Right style bike rack with Fat Bike option


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Installation Instructions PDF
RockyMounts Fattie - Fat Bike Adapter

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