Just saw the problems that the F3 folk are have with Corbin seats. Sorry Guys. I have a BRP custom seat on my Ryker and I still get butt pain after about an hour and was thinking about a Corbin or Ultimate seat for my Ryker. My problem is if I go with Ultimate I will lose the custom saddle bag set up I built since it covers the max mount so I was leaning to a corbin. Any inputs on these seat on the Ryker?