I will try to keep this short, sorry! "Willie G."Davidson, the grandson of the original "Davidson" came to work for the factory in 1968. This Super Glide project was his very first design project for the company. He went out to see what everyone was doing in the custom world. Stripping bikes down to a bare minimum...not a bad concept as far as I'm concerned. He took a 74 inch "Bagger" or an "Old Man's" bike and tore off all the touring garbage, Fairing, saddle bags, 5 gallon tanks and of course the FL {wide} fork and front wheel. He then took the complete fork assy. off a Sportster {a narrow one}, fender and wheel, which explains the mismatch on the early 71 rims. He put a set of 3 1/2 gal. tanks, still using the FL dash and then designed a fiberglass tail section using a tailight from a 1965 Chevy Impala, probably a pretty radical idea for HD. So now you have a big motor {74 cu in} in a lighter so called performance bike, just like a "Chopper". I repainted it in it's original "Sparkling America" red, white and blue theme. The bike did come in many different colors but this one got all the attention. 5700 of the FX Super Glides were made in 71 and this was the only year that they used the "Boat Tail" rear section officially in production, 72 they went to a Sporty style rear fender. The bike performs pretty good , by 1971 standards anyway... The brakes are terrible, anyone who's ridden one of these will agree. But all in all its a Cool bike. At least once each time I ride someone will croud me at a stop sign and and say "What The Hell Is That", I just laugh and ride off.