Halafast 20inch Wheel Frame

FBM Steadfast Frame

The FBM Halafast --
Dialed For Modern Trail Riding -- Designed For Younger Riders

Lukas Halahan with his FBM Bike

A 74.25 degree head tube angle, 13.5" chain stays (slammed), and a 9" stand over height keep the bike stable yet still nimble to whip.

The Halafast 20inch is based on the Steadfast, but scaled down for younger riders with input from Lukas Halahan.

We recommend a 28 or 30 tooth sprocket.

Handcrafted in the FBM Machine Shop in Ithaca, New York, USA
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Colors Clear, Gloss Black, Satin Trans Blue
Lukas Halahan
Top Tube Lengths 19-3/4"
Head Tube Angle 74.25 degrees
Head Tube Height 120mm
Bottom Bracket Height 11-5/8"
Seat Tube Angle 71 degrees
Standover Height 9"
Rear End Length 13-1/2" (slammed)
Dropout Spacing 110mm
FBM Halafast Frame - Mid Section
FBM Halafast Frame - Double Bend Chain Stays
FBM Halafast Frame - Dropouts
Head Tube Integrated - Externally Machined
4130 Chromoly
Top Tube 1-1/4" O.D. Double Butted
4130 Chromoly
Top Tube Gusset 3D Laser Cut
4130 Chromoly
Down Tube 1-3/8" O.D. Double Butted
4130 Chromoly
Down Tube Gusset 3D Laser Cut
4130 Chromoly
Bottom Bracket Mid - Internally machined
4130 Chromoly
Seat Tube Internally Butted
4130 Chromoly
Seat Post Clamp A Seat Clamp is Required
Seat Stays 3/4” O. D. x 0.035" Wall tapered to 5/8" OD
4130 Chromoly
Chain Stays Double Bend
3/4” O. D. x 0.049" Wall tapered to 5/8" OD
4130 Chromoly
Seat Stay Bridge 5/8" OD Tube
4130 Chromoly
Chain Stay Bridge 3/4" OD Tube
4130 Chromoly
Capped Stays Yes
Dropouts For 14mm axles
Heat Treated 3/16" Thick 4130 Chromoly
Brake Position Chain Stay
Brake Type Welded 990
Cable Stop Threaded and Slotted
Cable Guide Dual Slotted Tube
Rear axle positions (with new chains)
  • 13-5/8" with a half link - 28/9, 30/11, 33/12
  • 13-3/4" without a half link - 25/9, 28/10
  • 13-3/4" with a half link - 30/10
  • 13-7/8" without a half link - 28/9, 30/11, 33/12