aloha, with over 20k on my bike it's almost time to replace my chain and sprockets. from the following sprocket sizes what would yall suggest? i know the popular change is 16/44 BUT i found a great price and a 44 rear is not an option. i have read a number of threads on this topic and don't plan on riding wheelie's for days or entering the daytona 200. the site claims 16/40 is stock? anyways these are the choices 15,16,17 front and 40,45 rear. what do you think? thanks in advance and ride safe.