Univega Serial Numbers
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Trek Frame Serial Numbers

Prior to Late 1980 | Late 1980 to Late 1986 | Late 1986 to 1999+
Foreign Built After 82 | Jazz by Trek | Missing Serial Numbers

Aug 22, 2019 Often (but not always) the last two digits of the model number indicated the number of available gears, e.g., 912 was a 9-series 12 speed and a 914 was a 9 series 14 speed. Univega Serial Number Year Code Chart. Miyata 9x: This was the bottom of the range, entry-level model. Triple butted tubing, Shimano/Suntour entry-level components. On the form, please state the serial number and item number of your Univega e-bike. Cat Dozer Serial Number Year Model The nine-digit sequence of numbers can be found on the underside of the crankset above the item number and can be recognised by the letters 'S/N'.

Serial Number Location

Trek frame serial numbers (SNs) are typically stamped into the bottom of the bottom bracket shell. In the case of some early 80s Treks, the number is under the plastic cable guide on the bottom of the shell. Just remove the plastic cable guide to see the number. The other place Trek (or their subcontractors) stamped the SN is at 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 numbers.

Many early Trek bottom bracket shells have a one or two letter code stamped separately from the serial number. This was made by the individual framebuilder to mark his/her work. 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, if not done by the framebuilder. If you know which mark was used by a particular craftsman, please let me know.

Serialization Date

The dates coded in the serial numbers, or the dates inferred from the numbers, are dates on which the new frames were stamped with serial numbers (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 designs, and painted with colors, for the next year.

Hard to read?

Trek serial numbers 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 number:

Serial Number highlighted with red wax. Click on image to see an enlarged version. (Photo by J. Hansen)

'Rub the area with candle wax of a color that contrasts with your paint. Lightly wipe it off with a rag. The wax stays in the indented area of the S/N. Now you can easily read the number. I have included a photo of the results from my bike. In this case I used a red candle to make the serial number stand out. Note that even with the serial number filled with wax, the leading '0' is almost imperceptible.'

Serial Number Descriptions

The serial number descriptions are divided into five categories. Click on the link below to go to the appropriate category.

Prior to Late 1980 | Late 1980 to Late 1986 | Late 1986 to 1999+
Foreign Built After 84 | Jazz by Trek | Missing Serial Numbers

PRIOR TO LATE 1980

Before late 1980, Trek used an alphanumeric serial number scheme. Each seven-character number consists of three letters mixed with numerals. The serial number list and the code for the list are not available from Trek (but hope springs eternal). In the meantime, we have the results of the serial number decoding project:

Serial Number Decoding Project

Nearly two hundred Trek owners submitted their frame's specifics to help decode Trek's first serial number system. Our thanks to these generous cyclists. Trek used this system from 1976 to late 1980.

A variant of this first system was used in 81 and perhaps 82 for some frames. See **** year exceptions below.

These serial numbers have seven characters, in the form L N L N L N N, where L is a letter and N is a number.

Here are the results:

The first letter is the model designation. The letter code indicates frame model, which would include bike models made from that model of frame.

A = 310 (see note * below)
B = TX200 (see note ** below),
C = TX300,
D = 530,
E = TX500,
F = 510 (****see year exception B below),
G = TX700 and TX770 (see note*** below),
H = 710,
I = 730,
J = TX900.
K = 910,
L = 930,
M = 412 and 414 (**** see year exception A below),
N = 610, 613, and 614 (****see year exception A below)
O = 950. (**** see year exception D below). This numbering system was used for custom 950s. This letter may also have been used for custom 750 frames. If you have a leading O (Oh) serial number on a frame with Reynolds 531 stickers, please contact me (Skip). This applies only to serial numbers in the form LNLNLNN where the first letter is an O (Oh). This does not apply to the all-numeric serial number form that began in late 1980. These begin with a zero not an Oh. For these all-numeric numbers with a leading zero, see LATE 1980 to LATE 1986 below.
A couple of serial numbers have been submitted that are missing the first letter. This letter designates the model. The remaining six characters are typical. It appears that some custom frames were built that did not fit within the standard model description. For example, a 710 frame made with Columbus tubing instead of 531. What leading letter to use? Perhaps it was just left blank?

The first number is the frame size, where

1 = 19.75',
2 = 21',
3 = 22.5',
4 = 24',
5 = 25.5',
6 = 57.5 cm (ctc) or indicates a custom size. (See Year Exception D.)
7 = 59 cm (ctc) or indicates a custom size. (See Year Exception D.)
9 = 63.5 cm (ctc) or indicates a custom size. (See Year Exception D.)

The second letter represents the month the frame was serialized:

B	D	F	H	J	L
Feb	Apr	Jun	Aug	Oct	Dec

The second number is the last digit of the year, 6, 7, 8, 9 (for 197X) and 0 for 1980. See note below,****, for year exceptions. Aga

Univega Serial Number Year Chart