Its custom from its frame geometry up. Specifically if you've ever tried to ride a velodrome optimized track bike with steep angles, short wheelbase and a high centre bracket on a flat dirt track you'd understand why. Stability is king racing on flat dirt tracks. It was 50yrs ago. All of the attributes assigned to a good velodrome frame serve to destabilize you racing on dirt.
If you'd actually read the text on the link you'd already know this.
Its custom from its frame geometry up. Specifically if you've ever tried to ride a velodrome optimized track bike with steep angles, short wheelbase and a high centre bracket on a flat dirt track you'd understand why. Stability is king racing on flat dirt tracks. It was 50yrs ago. All of the attributes assigned to a good velodrome frame serve to destabilize you racing on dirt.
If you'd actually read the text on the link you'd already know this.