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Dia-Compe cantilever brakes don't appear to have a date code, but supposedly the 981, 983, 986 brakes were first introduced in 1981, 1983, 1986, etc.

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.

For example, the back of cranks are usually marked with crank arm length in mm, typically in the range of 165 to 185.

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Feel free to quote small parts of the information on this page, but copyright law requires be listed as the source of the information.

In this website, we credit the people involved in the understanding of these codes. (Naturally, for information provided by others, such as for the Campagnolo and Williams codes, the original source should be cited.)Ben writes: "Brakes and brake levers often have date codes on them.

Especially useful, and challenging to sort out and verify, was the Shimano code.

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

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

Other manufacturers of bicycle components have date marks on their pieces.)Most early Treks (1976 through about 1980) were sold as framesets.The components were added by the local bike shop or by the buyer. Components also could be swapped from an existing ride to the new frameset.Weinmann and Dia-Compe calipers usually have codes on the back of a caliper arm.This can be simple like "0784" (month 07, 1984) or a clock-type, with year in the middle and a ring of numbers with a tickmark pointing to the month.""Dia-Compe road levers usually have a code stamped _inside_ the lever.The rear derailleur freewheel/cassette and chainwheels are probably the first to be changed on a bike.

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