Santa Rosa - and all of NorCal for that matter - has a rich history with frame builders. From Eisentraut to Salsa, Sycip, and Retrotec, the names and faces of this little realm within the cycling industry have such great stories to tell. While I'm working on a few more posts from my recent trip to Santa Rosa, I thought I'd share this unique build with you. High in the rafters at Trail House hangs this 1990's Kostrikin rigid single speed mountain bike. These days, bikes like this are still rolling around, converted with "limp dick" stems, baskets and flat…