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Following Ben's lead - I checked three sets of Dia-Compe G calipers and all have the four-digit date code on the back of one of the arms.

Two men who met on an online dating site fight over loans; after a domestic dispute turns physical, a man sues his ex-girlfriend for rent, bills and a flowered, purple bicycle; a woman sues her neighbor because a fire destroyed her trees.

[Atom] [Brooks] [Campagnolo] [Dia-Compe and Weinmann] [Huret] [Maillard] [Normandy] [Nitto] [SR (Sakae)] [Sachs-Huret] [Shimano] [Strong] [Sansin] [Sunshine] [Sun Tour (Maeda)] [Sugino] [Tange] [Williams] [Dancing Chain] [Saddles]The date of manufacture of a bicycle's components can often be used to determine the date of manufacture of the bike itself.

On a vintage bike in excellent condition (that apparently had a lonely existence in a garage) all of the components likely are original.

As the wear on a vintage bike increases, the greater the likelihood components are not original, either through replacement of worn parts or through component swaps.

The rear derailleur can often be dated to a year or two by referring to the book "The Dancing Chain - History and Development of the Derailleur Bicycle", by Frank Berto, 3rd edition 2009.

The Appendix gives dates of initial manufacture for the vast majority of derailleurs made from 1920 to 1999.

Seatposts are marked with outside diameter, also in mm.

For old Treks, 27.2 is the most common, but for other bikes the diameters can range from 25mm to 33mm.

Also gathered on this page are date codes decoded and generously provided by others.

For Treks, the SR date markings are especially important.

Other manufacturers of bicycle components have date marks on their pieces.