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). If you know which mark was used by a particular craftsman, please let me know. 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. This was made by the individual framebuilder to mark his/her work. Many early Trek bottom bracket shells have a one or two letter code stamped separately from the serial number. Sales persons sometimes had difficulty reading the numbers. Note: The SN on your original sales receipt may not match the one on your bike. The other place Trek (or their subcontractors) stamped the SN is at the lower end of the seat tube. Just remove the plastic cable guide to see the number. In the case of some early 80s Treks, the number is under the plastic cable guide on the bottom of the shell. Trek Frame Serial Numbers|||| Serial Number Location Trek frame serial numbers (SNs) are typically stamped into the bottom of the bottom bracket shell. It has Shimano brazed on cable guides on top of the BB flanking the seat. I don't know what's exactly model and year of this bike but i think it`d be on. I figured out all the serial numbers for Miyata Bicycles Made in Japan.
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