Check out this early prototype pursuit track bike designed and built by Brent Trimble. This bike was a predecessor to his famous Kestrel 4000. Brent fabricated this in the early 1980’s in Anchorage, Alaska. #redhookcrit #trimbleracing redhookcrit 8 years ago Check out this early prototype pursuit track bike designed and built by Brent Trimble. This bike was a predecessor to his famous Kestrel 4000. Brent fabricated this in the early 1980’s in Anchorage, Alaska.