![]() Some frames in this period have a leading 'A' before the 6 digit number.The 58 or 60 refer to the angle between the seattube and the downtube. ![]() This designation is not part of the serial number but is a model number of the shell. The new bottom bracket shell is typically marked with 58TSI (or more rarely, 60TSI). Isaac designed new lugs and a new bottom bracket shell for Trek.
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