It still may be that this is a 1980(s) bike, but was fitted with parts from the previous year or two (not an uncommon practice). The frame design indicates a mid-late 70's bike, and components more late 70s. The Sun Tour components also have date codes of two letters (year/month). These cranks are more likely to be found on an entry level sport/recreational or touring bikes this is also typified by the dual eyelets at the front and rear dropouts for mounting fenders and racks. The crankset is of a low end quality the ring "fixing bolts" are not flush to the ring/spider, and the large ring integrated with the spider is low end design there were many versions of "APEX 5" cranksets of higher quality.
The "SR"/Sakae Ringyo (crankset) should have a date code on the inside of the arm generally a two digit number (year) followed by a letter (month). Personally, I would check the components for date codes on them. You may be able to research that number, but it is usually a hit or miss endeavor. The "G" may also be a date code itself or in combination with the numbers. It may very well be that that first or last "80" is a date code however it could also be that the first "8" is a date code of the last digit in a year (ex. I don't know how Bridgestone serialized their bikes. Does the 80 at the end mean the bike is from 1980? (06-03-2020, 12:34 PM)MotorCit圜obra Wrote: Spotted the serial number after cleaning the bike. What year is this bike from, and is it handmade? I think its from the late 70s.Īnother issue/question: when i push down the left gear shitfer, the chain on the bike comes off. It is a Suntour Power gearsystem/shifters and on the bike it says "Tested Finest Bicycle With Precision Mechanism". Today i bought myself a vintage Bridgestone for about 200$.
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