![]() ![]() Some early and mid 80s bottom brackets were marked with 58TSI or 60TSI.Some of these are presented in the 83, 84 link at the bottom of the table. Some of the Model 170 serial numbers are 6 digits but do not follow the numerical sequence.For example, a 1981 frame appearing on the list as a Model 610 could have been built into either a 613, 614, or 616 bike. For some years, the model number given may be the lowest number (or an X00 number) for a series of models that have the same frame. ![]() ![]() This may be a result of subcontracting some frame fabrication. The year designations in the table are approximate not all of the runs are sequential in time. This journal information is summarized by year in Table I. At some time late in each year (generally September or October) frames were built for (then painted with colors for) the next model year. Table I contains dates of frame serializing, and are not necessarily model year. ![]()
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