one chain loop
Oh you mean like this thunderbolt? 1988 model frame, 1" headtube (oy vey), u-brake in the back, fillet-brazed prestige chromoly tubing. Nothing's original other than the frame on this one.
Or my 1991 Stratos whose only original parts are the frame and the DX derailleurs.
Or a nicely restored 1991 Rocky Mountain Hammer (which is for sale btw).