FRAME SPECS

4130 Chromoly. Triple-butted walls. Orbital TIG joints purged with argon. Every dimension pulled from the bedrock beneath Garwin, Iowa.

Wall thickness: 0.8mm butted to 1.2mm. Weight budget: 7.2kg ± 0.3. Stiffness target: 12% above baseline Tama County geometry.

ENTER THE SPEC SHEET →

RIDER PROFILE

The frame is static until a mass moves upon it. Define the human variable: center of gravity, saddle setback, acoustic signature. Where the rider meets the steel.

Mass range: 70–95 kg. CG vertical: 850–950mm from BB. Delta threshold: 3.2dB. The rider is the sensor.

LOAD THE PROFILE →

BUTT SCHEDULE CALCULATOR

Input your target stiffness-to-weight ratio. Output: triple-butted wall thickness profile solved via polar moment of inertia optimization.

Grounded in alloy-steel (Q1070521) and bicycle-frame (Q167130) ontologies. Machine-readable spec sheet included.

RUN THE SOLVER →

FIRST SLIP

Every welder has a story about the joint that didn't hold. Mine involved a melted torch tip, a puddle that ran wild, and a lesson burned into my retinas.

This is where I learned that precision isn't about perfection—it's about knowing exactly where the error lives, and how to fix it.

READ THE SCAR →