Bike frame dating

Added: Jannifer Clayson - Date: 10.11.2021 11:16 - Views: 10480 - Clicks: 2348

Trek frame serial s SNs are typically stamped into the bottom of the bottom bracket shell. In the case of some early 80s Treks, the is under the plastic cable guide on the bottom of the shell. Just remove the plastic cable guide to see the. The other place Trek or their subcontractors stamped the SN is Bike frame dating the lower end of the seat tube.

Note: The SN on your original sales receipt may not match the one on your bike. Sales persons sometimes had difficulty reading the s. Many early Trek bottom bracket shells have a one or two letter code stamped separately from the serial. On some bottom brackets there are two codes: one indicating the maker of the main triangle and the other for the maker of the rear triangle or perhaps the person who cut and shaped the tubing, Bike frame dating not done by the framebuilder.

If you know which mark was used by a particular craftsman, please let me know. The dates coded in the serial s, or the dates inferred from the s, are dates on which the new frames were stamped with serial s serialized. These dates are not necessarily the same as the model year of the frame. At some time late in each year beginning generally September or October the frames produced were created from des, and painted with colors, for the next year.

Trek serial s can be hard to read. Clean the area well, and use lots of light at various angles. A suggestion by J. Hansen can help you read a serial :. Lightly wipe it off with a rag. Now you can easily read Bike frame dating. I have included a photo of the from my bike. In this case I used a red candle to make the serial stand out. Note that even with the serial filled with wax, the leading "0" is almost imperceptible.

The serial descriptions are divided into five. Click on the link below to go to the appropriate category. Before lateTrek used an alphanumeric serial scheme. Each seven-character consists of three letters mixed with numerals. The serial list and the code for the list are not available from Trek but hope springs eternal. In the meantime, we have the of the serial decoding project:. Serial Decoding Project. Nearly two hundred Trek owners submitted their frame's specifics to help decode Trek's first serial system.

Our thanks to these generous cyclists. Trek used this system from to late A variant of this first system was used in 81 and perhaps 82 for some frames. The first letter is the model deation. The letter code indicates frame model, which would include bike models made Bike frame dating that model of frame.

This ing system was used for custom s.

Bike frame dating

This letter may also have been used for custom frames. If you have a leading O Oh serial on a frame with Reynolds stickers, please contact me Skip. This does not apply to the all-numeric serial form that began in late These begin with a zero not an Oh. A couple of serial s have been submitted that are missing the first Bike frame dating. This letter deates the model. The remaining six characters are typical. Bike frame dating appears that some custom frames were built that did not fit within the standard model description.

For example, a frame made with Columbus tubing instead of What leading letter to use? Perhaps it was just left blank? See Year Exception D. The second letter represents the month the frame was serialized:. The second is the last digit of the year6, 7, 8, 9 for X and 0 for Again, this is the date of serializing, not necessarily model year. The last three characters - The final letter ranges from A to Z and the final two s go from 01 to The last letter might be a run deation, with the last two numerals the frame in that run? Alternatively, the letter extends the range of the character from 0 to 9 if a to 1 to This gives a range of for the 3 characters.

Any other ideas for these last three characters? The rest of the code defines time to a month. Hence the change to the sequential system that was started in late It has touring length chainstays. According the the SN, it apparently was made in Juneafter the TX is no longer in the brochures, but no similar frame is listed. Another small mystery; for now we'll call it a It has a leading B and has eight characters instead of the usual 7 B4K6B The date from the SN is Nov.

Probably a TX with an extra character in the SN. TX frames were available as special order, with Columbus tubing instead of the specified Reynolds These bikes were deated as Model TX However, this model did not appear in any of the Trek brochures on this site. Serial Bike frame dating beginning Bike frame dating M or N 41X and 61X bikes or frames seem to have a different meaning for what normally is the year digit.

The year digit is the fourth character in the. In the 50 M and N serial s that have been sent in by owners, the year s go from 0 through 9. The remaining part of the serial s seem normal. According to the brochures, Trek did not make 41X and 61X bikes or frames during 76, 77, 78, and 79 and also not in 83, 84, 85, 86, 87, 88, or Bike frame dating serial s apparently do not follow the year convention used for other Trek models.

It is likely these frames, SNs beginning with M or N Models 41x and 61Xwere contracted out or were made in a separate Trek facility, and were given the old serial form so as not to interfere with the sequential s being ased by Trek in their main shop, which began in late This variation to the SN system may have been done to extend the ing system. By using the fourth character as an extension of the last three, the serial s could be extended from possible combinations to 26, for a given month. For M and N leading serial s, if the TREK letters on the seattube have no colorwrap behind, the bike is from or perhaps If it has a colorwrap, the bike is probably from Serial s for four model frames with a leading F have been reported that have similar unexpected year dates.

The fourth characters are 2, 3, 4, and 5, there may be more. The frames have the early TREK graphics on the seattube. These frames may be related to the M and N leading serial bikes in the section above. One early TX leading Gan evaluation frame sent to a bike shop, had a 4 in the year digit. Another impossible year code. This 4 may ify an evaluation unit. Trek used this form of serial Bike frame dating O "oh" for their custom-made frames. The production non-custom frames were ed using the late to system described below. Three leading O frames have been reported that contain unlikely year codes of 5, 6 and 7.

Bike frame dating

Model frames were not made in76, or 77, but only in81, or 82, according to the brochures. Another frame was reported with a 0 zero in the year code, but was painted as a From the geometries, they all appear to be custom frames. When a Trek frame was repainted by Trek, an additional set of numerals was often stamped into the bottom bracket to indicate the frame was repainted. These s were usually four digits, in the form NNNN. Late inTrek changed to a new ing system for their frames built in the U.

The frames were ed sequentially, beginning with The record of the assembly runs was documented in a handwritten journal. Trek Kevin Tita graciously provided a copy of the journal for this web site. The list ended in November of with This serial system actually extended through at least see Table II below. The journal includes runmodelframe size, and serial range. Incidental information, including dates and comments on the frames, appears sporadically through the journal.

A "run" was for a particular frame size and frame model. We all owe thanks to Luker White who generously donated his time to convert much of the paper list to digital form. These data were mined to produce bike production by model for each calendar year. Click on the date link in Table I below to go to the detailed serial information Bike frame dating that year. This 6 digit 7 digit beginning in code extended into at leastat least for some models generally mid to upper level and made in the US.

The may or may not have a leading zero, making the six digits into seven digits prior to The model is not available for these s but the year Bike frame dating be determined or estimated from Table II below. The information in the table is from serial s submitted by site visitors. Our thanks to Bike frame dating. In contrast to the serial dates in Table I above, the years in Table II represent model years, not the date the serial was applied. Three different serial forms have been submitted for Trek Model frames. One, marked "made in Japan", begin with JS followed by six numerals.

The SN was located on the bottom of the bottom bracket. A second serial is According to the Trek-provided SN list, this corresponds to a 22" The third iswhich indicates foreign built, but the nation of origin sticker was missing. This was marked at the bottom of the down tube.

Bike frame dating

It is likely this was made by the same manufacturer as the bikes described in the paragraph below. For the Modelit appears Trek used three sources for their frames or complete bikes. Several Trek s, s and s have been reported with 9 digit numeric serial s stamped on the lower seat tube instead of on the bottom of the bottom bracket. These frames, or complete bikes, apparently were made in Japan by an outside contractor. The s submitted are in the range of to An 8 or 9 character alphanumeric code was used for mid- and low-level Bike frame dating subcontracted in Taiwan.

Most of these bikes were labeled "Made in Taiwan" although the sticker often is easily removed. This form of serial appears to have been used during the period to The le with a T for Trek? Sean Hickey suggested the first numeral is the year of manufacture, and the letter is the month of the year A - Bike frame dating.

Bike frame dating

email: [email protected] - phone:(120) 982-1230 x 4714

Determining the Age of a Raleigh