As a sportbike rider, my foremost concern is selecting a frame style that allows an unobstructed view when in the head-down full-tuck position—what I call peering through the eyebrows! Another important factor is the frame and temple/earpiece must comfortably slip into your particular full-face helmet and not lift or rattle around when experiencing helmet buffet at speed. The crux is that not all helmet interiors are similar, so a frame that fits well within one model helmet may experience interference if worn within another lid. Try before you buy. SportRx will send a selection of frame styles for you to try with your helmet, providing a full refund upon the return of those that don’t fit, and free shipping is offered.