FBM Berzerker Frame - Flat Black
Flat Black
FBM Berzerker Frame - Irock Blue
Irock Blue
Featuring:  SuperTherm top and down tubes, 3D laser cut 4130 chromoly top and down tube gussets, a brazed on integrated seat post clamp, brazed on removable 990 mounts and cable stop, and tapered seat and chain stays.
FBM Berzerker Logo
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Berzerker Head Tube Close Up

Berzerker Rear End Close Up

Berzerker Flat Black Close Up

Berzerker Irock Blue Close Up
Anthem x Steadfast
Colors Flat Black, Irock Blue
Top Tube Lengths 20-1/2", 20-3/4", 21"
Head Tube Angle 75 degrees
Bottom Bracket Height 11-7/8"
Seat Tube Angle 71 degrees
Standover Height 7-3/4"
Rear End Length 13-3/8" (slammed)
With Brake Hardware
4 pounds 8 ounces (4.5 pounds)

Without Brake Hardware
4 pounds 6.5 ounces (4.4 pounds)
Head Tube Integrated - Externally machined 4130 Chromoly
Top Tube 1-1/4" O.D.
Double Butted SuperTherm
Top Tube Gusset 3D laser cut 4130 Chromoly
Down Tube 1-3/8" O.D.
Double Butted SuperTherm
Down Tube Gusset 3D laser cut 4130 Chromoly
Bottom Bracket Mid - Internally machined 4130 Chromoly
Seat Tube Externally Machined 4130 Chromoly
Seat Post Clamp Brazed on wrap around integrated clamp with a captured nut
Seat Stays 3/4” O.D.x 0.035" Wall tapered to 1/2" OD
4130 Chromoly
Chain Stays 3/4” O.D.x 0.049" Wall tapered to 5/8" OD
4130 Chromoly
Bridges 5/8" OD tube bridges 4130 chromoly
Capped Stays Yes
Dropouts Heat treated 3/16" thick 4130 Chromoly for 14mm axles
Brake Position Seat stay
Brake Type Brazed on removable 990's
Cable Stop Brazed on removable
SuperTherm from True Temper is a proprietary superthermophillic (heat-loving) alloy, developed in partnership with the U.S. Steel Alliance. The composition of Chromium, Molybdenum, and Vanadium with an unprecedented 217 ksi ultimate tensile strength makes this alloy actually gain strength through a metallurgical transformation in the heat-affected zone as a result of welding or brazing. SuperTherm is highly temper-resistant, resulting in an 11% increase in fatigue life and a 20% increase in impact strength heat treated 4130. The increased mechanical properties of SuperTherm allow for incredibly strong, yet lightweight frame designs with that legendary feel of steel ride quality.