Most professionals when they ride their motorcycle on a track, measure several data items; amongst others the lean angle (or better know as inclination), the G-force encountered, acceleration, etc. Although some modern sportsbike are able to measure some of this data on their own, there's a gadget for those that can not, and want to....More Here: http://news.motorbiker.org/blogs.nsf/dx/find-out-what-your-lean-angles-are-on-the-track-like-a-pro.htm