To me, EVERY bike is an adventure bike. I’ll never buy a GS type bike, because I have a 28 inch inseam. (Also, the sameness of all those boxy panniers and price-of-a-decent-bike rain suits puts me off.) But I rode my Yamaha CS5 up Sandia Peak in New Mexico a few years ago on a ribbed front and K70-clone rear, on the…