réponse de DansHaro sur VintageBMX à propos de ce vélo (qui aurait existé uniquement en deux exemplaires, le blanc pour Dominguez, le chromé pour Sigur, et qui ne seraient même pas identiques..):
Yep it was a prototype, nothing more nothing less. I put out a challenge to anyone to come up with one. I am pretty sure the two (one chrome and one white) we have seen pics of didn't survive. I have talked to Bob about it and Mike D, and the verdict is that to be a true freestyle bike it needed a standing platform. The Sport was originally designed for Mike and as we all know he was a vert rider, but for saleability to the masses it needed to have that standing platform.
tiré de:
http://www.harobmxcollector.com/riders/name-here/
Interview de Rich Sigur, designer à priori du sport:
When you joined, you didn’t get on too well with the current Haro Freestyler as it was too short, so you continued to ride your Supergoose. Haro then decided to develop a bike for you with a longer wheelbase, and the picture of you on the chrome “single top tube” Sport prototype, shows a bike with an extended rear triangle. Do you recall how that frame came to you and what happened to it?
When I initially rec’d the twin tube Freestyler I rode it for a few months trying to get used to it. It rode really well and I had a lot of fun riding it on my back yard ramps dirt jumping etc. I did notice for me though I needed a little more space to keep my knees from banging against the bars even with a layback post. Being a lanky kid, a longer frame was more stable in the air for me and the longer front triangle helped center my weight in the air. Up until this point I wasn’t on contract with Haro at the time. I was on product sponsor from Haro and other companies as well such as Skyway and Mongoose. Russ Okawa from Mongoose sent me the Supergoose frames that I rode early on which you mentioned above.
Eventually, I asked Haro to design a longer frame specifically for skatepark duty only and the original Haro Sport prototype is what was produced from that conversation. It was based on the Haro Freestyler geometry only stretched out on the front and rear triangles. I rode the original prototype frame for several contests until it broke on one of the rear dropouts. I put it back in the box and gave it back to the factory so they could improve on the design. I’m not sure what happened to it after that.
tiré de:
http://www.harofreestyler.com/about.html
1984 Haro Sport
Also in 1984 Haro introduced a new model called the Sport. This bike was developed for Mike Dominguez for vertical trick riding. The Sport frame is an inch longer than the Master. The steering is slightly slower for more stability and improved handling at higher speeds.
There was a prototype model with a single top tube configuration made by Torker. There was a US Torker made version of the production Sport which the rear triangle was identical to the first generation US Master, this is referred to as a 1st generation ’84 Sport. The serial number is located on the inside of the right rear dropout and its format is as follows: T which stood for Torker followed by two letters which was a date code followed by the four digit production sequence followed by HS which stood for Haro Sport.

Je n'ai pas retrouvé la photo du sport sans plateforme réalisé par Chip, je crois, que l'on a aperçu lors de compte-rendus de réunions oldschool. Monsieur Théophile Ceday (TCD), pourrait certainement vous en dire plus.
Le Hang Five, c'est comme une boite de chocolat, on ne sait jamais sur quoi on va tomber... Le nez, les mains, les dents...