Both actually! Typhoon was a "lower ticket" model, and had lower cost options i.e. painted wheels and fenders. But after about 68 or so, just about everything came with chrome wheels and fenders. As for different sized frames for different models, not so much. Cantilever frames came sized for 20", 24", and 26" wheels and the dimensions were all the same regardless of model distinction. The two possible differences that come to mind are, a middle weight frame and a heavy weight frame would have had different dimensions for tire clearance. And there was a "king size" frame that was a bit taller, but that was like a year or two, if memory serves correctly.