What the hell was Nakano doing in the first heat? He passes Singo on the right, then looks over his right shoulder and moves down. He had him beaten anyway.
The crash in final race was Singleton's fault though. Too many people blame Nakano for that crash just because Singleton comes off worst out of it.
That must have been just about the only world championship ever won on a Suntour Superbe Pro equipped bike. (But not the only major race - the 1984 Olympic road race was won by Alexi Grewal on a Suntour equipped Pinarello).
Nakanos bike was:
Frame/fork: Nagasawa
Headset: Hatta (I believe)
Rims: Araya Super Aero
Spokes: 36 hole 3x (Hoshi?)
Hubs: Suntour Superbe Pro
Cranks, chainring, bb: Suntour Superbe Pro
Seatpost: Nitto
Bars/stem: Nitto
Toe clips: MKS
Seat: Kashimax Gold Star
Tyres: 20mm. Not Soyos. Maybe Panaracer?