Shimano 'Zen' Olympic chain ring 144pcd 54T

Super wide 144pcd, Olympic/World Championship track chainrings from Shimano.
These rare Dura Ace rings are very hard to find, even in Japan, and are the correct 3mm thickness, to suit 1/8 track chains.
I was lucky to come across a stash of NOS rings earlier in 2009 from a source linked to the UCI. These are not even available from Shimano in Japan.
46,47,48,49,50,51,52,53,54 and 55T in stock. Once these are sold, they will be very tough to find anywhere! They are much lighter than the shape suggests, due to cavities milled out of the back side.
Fits 144 track crank sets, such as Sugino 75, Grand Mighty and Aero Mighty, Suntour Superbe track, Dura Ace 7600, 7710, and Campagnolo pista.