Thanks. That is what I suspected. The change in the top tube length for whatever reason was offset by other factors to keep the handling similar to the original. I have been riding the 71 for about 4-5 months. I have enough of everything except garage space to build up the 74 also. f anything the top tube and reach of the 71 has felt a bit long for some reason although certain measurements like seat to handlbars are identical to my 75 Professional, which is a perfect fit.