dirt bike builds

Hello everyone Just joined today as I am finally putting my love of motorcross bikes and mounts bike together. I need to buy a rear disc sprocket adapter and was wonder what the best amount of teeth should I use as I'm riding it on a 24"

Hello I'm still new here but have been reading threw threads for months and have gotten tons of great info. I'm interested in building a dirt bike style motorized bike out of a good mountain bike frame. Has anyone tried this? Had success or failure? Why would it be or not be a...