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Our swingarm conversion kit will enable you to mount a 300 tire on your stock 2018-up Milwaukee Eight FLFBS Fat Boy’s and FXBRS Breakout’s without doing any modifications to the frame and keeping the original Harley belt! It can fit up to 10.5” wide rims. Thanks to this innovative swingarm kit you will be able to mount a super-wide rear tire on your Harley-Davidson Milwaukee 8 Fat Boy or Breakout.

Please note that in order to keep stock width belt, rear wheel will need to be offset to the right 0.4″ (or 10mm).

To allow room for the wider swingarm a shorter exhaust system must be used or the OEM exhaust manifold will need to be spaced out.

For the 300 tire you will need also a wider fender, since the stock Harley-Davidson one cannot fit.


Kit includes raw swingarm, axles and all necessary components for the primary offset.

NOTE: kit does not include wheels, rear pulley, rotors, tires or rear fender, which are sold separately. Swingarm comes in raw finish and needs to be painted.