hell cat

Earlier this month, the board displayed samples marked “BMW,” “Tom Brady” and “Hell Cat” — every one having tested positive for fentanyl and xylazine.

It was almost finished, but it would probably be a while before the bike hits the dirt, and even longer before anyone else gets their hands on a Hell Cat.

Sitting in his Williamsburg workshop earlier this week amid a slew of half-finished bike frames, motorcycles in various states of repair, surfboards and metalworking equipment dating back to the 1940s, Mr. Callahan worked on the details of the Hell Cat.

Mountain biking is not a cheap sport — a top-of-the-line Cannondale can cost more than $7,000 — and for those hoping to get a Hell Cat of their own, it will take some money as well as patience.

The frame — named the Hell Cat in honor of his pet tabby, Charles — may look like any of the dozens of others sitting in apartments or chained to street signs around the city, but there are subtle differences that Mr. Callahan says make all the difference.