An Experience in Moments: Callahan’s in the big ring. Posted on July 9, 2012 by Qamuuqin Griffo and I rode out to the Old Siskiyou Hwy. and up to mile post 6, where the construction is, before cruising back down. Grif was on his fixie, so I put my RB-1 in a similar gear and we both ground our way up the climb. Fun times. Full slideshow after the jump.