I recently changed my XR600 sprockets to 15:45 from 15:48 (stock is 14:48). I use my bike for dual-sporting and the bike is much nicer to ride on the street now. I would like to keep the 45 tooth rear and switch to a 13 or 14 tooth frontsprocket when I do serious off-road stuff. What is the recommended chain length (108 or 110 links)for this setup? Someone here on TT originally suggested this idea to me years ago. Mike.