Mountain biking in Negril

Hello! Heading to Negril today for the first time ever! So excited. Came across some blurbs about mountain biking on the Internet but couldn't find any real information. I am from Colorado and love mountain biking. I was wondering if anyone has leads on wear to rent half way decent bikes and find some single track? My research kind of lead me in circles around a guy named Rusty who used to have an operation in Negril but has since left.

Would love to hear any feedback about mountain biking in Jamaica or any other fun activities :)