Please note, it is very common for older bikes to use components from a year or two (sometimes) more prior to the actual build year, so always use this as a rough guide. The code system was in place from 1976 to 2003 and usually consists of two letters, the first relating to the year & the second to the month of manufacturer. If you have a full Shimano groupset you should be able to find a two letter date code on at least one of the parts.įront mechs do not always have a date stamp, but this lucky Shimano 105 does These almost always have codes etched in, but unfortunately they don't always have them. The best parts to look for date codes of the Shimano parts are the crank arms, rear derailleur & hub bodies. After that you can use other factors such as frame details & colour scheme to narrow it down even further, we'll cover frame details in another post, so for now you can use this table below to help you get started. Using components to date a vintage bike is a good way to put you in the right era. This alone, however, is not concrete evidence that your bike is from a certain year, but it's an excellent starting place. If you're lucky enough to have Shimano parts on your classic bicycle, it's actually very easy to get pretty close. HH date code on a Shimano rear derailleur means it was manufactured in August 1983 There are other ways to try and narrow it down (retro catalogue scans, frame detail, decals & tubing stickers etc.) but again they can be quite vague and inconclusive.
There are many examples of frame-builders using frame numbers that do make sense, but chances are if you're reading this then you are not that fortunate.
Your first port of call should always be the frame serial number, but that's not always an option as many frames don't have frame numbers stamped on them, and if they do they are often impossible to decipher. Dating a classic bike can be very tricky.
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