G e dating

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.Swaps can take place early in the life of a bike as the proud new owner upgrades to new or used components of higher quality.Since several models can share one chassis type (for example, the early brown 5G7 Bandmaster, 5G5 Pro and 5G12 Concert), this kind of interpretation is inaccurate.Instead, there were approximately 2000 of these chasses produced, which then ended up as one of the three models in question.For old Treks, 27.2 is the most common, but for other bikes the diameters can range from 25mm to 33mm.

Links to Shows Beginning with: , which also includes instructions on how to send us e-mail for corrections to menus or general show info.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 rear derailleur freewheel/cassette and chainwheels are probably the first to be changed on a bike.On a vintage bike in excellent condition (that apparently had a lonely existence in a garage) all of the components likely are original.This clearly is when the component was made and not when the bike was made, but unless the component or bike manufacturer had lots of stock lying around in inventory, the date should be a fairly good indication of the year of the bike.At least it would be the earliest date that the bike could have been made.This makes dating the components an interesting archeological investigation, but one not necessarily related to the date of the bike. Trek owner Larry Osborn made this observation, and suggested this as a supplementary way of dating a Trek (and other bikes as well).Fueled by this first realization, and with the help of other bike folks, Larry and I have sorted out other codes (a project still ongoing).For Treks, the SR date markings are especially important.Virtually all of the Treks not equipped with Campagnolo or Shimano Dura-Ace components, started life with some grade of SR seatpost and may also have SR stems, bars or cranks.

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