Diamond Back Senior Pro Specifications

Part	Details
Finish	Triple high-lustre chrome.
Frame	Diamond Back Pro Large, 4130 chrome-moly. (Koizumi) 1.9kg / 4lb 4oz
Fork	Diamond Back Pro Large 4130 chrome-moly. (Koizumi) 700g / 1lb 9oz
Handlebars	Diamond Back Pro, 4130 chrome-moly. (Koizumi)
Grips	Oakley II.
Headset
Stem	Diamond Back (by Sugino) aluminium alloy clamps with chrome-moly shaft.
Rims	Araya 7X with polished sides.
Spokes	Double-butted stainless steel with alloy nipples, 80/60.
Hubs	Sunshine Pro-Am track hubs.
Brake calipers	Dia-Compe 890 quick-adjust side pull rear callipers. Dia-Compe two-finger brake lever. Kool-Stop International air-cooled brake pads.
Brake levers	Dia-Compe.
Brake pads	Dia-Compe.
Cables	Dia-Compe.
Tires	Diamond Back Skinwall Knobbies (by IRC).
Pedals	Diamond Back BM10 (by MKS).
Cranks	Sugino one-piece chrome-moly, chromed, 175mm.
Bottom Bracket	Tange
Front Sprocket	44T, Diamond Back (by Sugino) chainwheel. Sugnio Spider.
Rear Sprocket	16T SunTour
Chain	Sedis Sport 3/32 inch
Seat	Diamond Back (by Kashimax).
Seat Post	7/8″ Fluted aluminium alloy.
Seat Post Clamp	SunTour, aluminium alloy.

Identifying characteristics

The Diamond Back Senior Pro is a Koizumi made Diamond Back frame and forks. It is part of the pro kit.

The production run was from mid 1981 until 1983. The senior pro was the base bike that developed into the legendary Harry Leary Turbo model.

Identifying characteristics/things to look out for include:

• A serial number beginning with either a 1 ,2 or 3 meaning 1981, 1982 oe 1983
• Loop tail