I think the mad prices are for the specific shimano track rings that came in a bigger chain size, 10mm.iirc. Y is 2000 and the wrong era?
https://velobase.com/ViewComponent.aspx?ID=1902059B-9843-4F96-A3E7-4E95E1699521&Enum=115&AbsPos=40
@midlife started
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I think the mad prices are for the specific shimano track rings that came in a bigger chain size, 10mm.iirc. Y is 2000 and the wrong era?
https://velobase.com/ViewComponent.aspx?ID=1902059B-9843-4F96-A3E7-4E95E1699521&Enum=115&AbsPos=40