Hi, Josh- No 'I's (or 'O's) were ever used in Schwinn SNs, I don't think, due to their similarity to 1 and 0. All the Schwinn SNs with which I'm familiar are on the head tube (or head badge) or on the right drop out. So I'm thinking that what you're looking at is a part ID number. Look in the other spots and see if you find anything. If that is a Serial Number, it could be a Japanese-made frame--then the letter could be J or L, as Pastor Bob says. In that case, J=September and L=November, and the second digit would be the last digit of the year (in the 1970s, I presume). That would make your bike 1977. Edit: According to a post on the Schwinn Forums by Scooper from 2006. I think that some bikes before the 1960s had SNs elsewhere, but I'm not for sure. Edit: 1951 and before, according to 'bunchobikes'--but weren't those mostly middleweight and heavyweight, with ashtabula crank? I have an early 80s Japanese Schwinn, and it's SN, if I recall, is on the dropout. Good quality, closeup pics of the frame (i.e., lugs, dropouts, etc.) and of the original components, if any, would help a lot. OHHHH, the Greenville-built Schwinns. Well, yes, of course they're different! This free PC program was developed to work on Windows XP, Windows Vista, Windows 7, Windows 8 or Windows 10 and can function on 32 or 64-bit systems. Microsoft Visual Basic is categorized as Development Tools. The Microsoft Visual Basic installer is commonly called VB6.EXE, VB5.EXE. Aug 16, 2012. A security issue has been identified that could allow an attacker to compromise your Windows-based system running Microsoft Visual Basic 6.0 Service Pack 6. Microsoft Visual Basic, free and safe download. Microsoft Visual Basic latest version: New version of the well-known programming environment. Microsoft Visual Basic Express allows us to develop applications for Windows and compile them vis. Visual basic 6 for windows 7 64 bit. Er, actually, if they are, I didn't know that. Oh, but of course, for me, Schwinn time ends in 1980, since the SLDB ends in 1980. So, what's the formula for post 1980 Schwinn SNs, and what year does it stop being reliable? At least as far as the Schwinn le tour models go, the serial numbers weren't on the bottom bracket shell until 1984; my 1983 has the serial number on the dropout, but the '84 has it on bb shell. Schwinn Bike Serial Number ListGene from genesbmx.com web site provided this great info on figuring out your old trusty Schwinn; Schwinn Bike Dating After 1965, Schwinn serial number sequences, while appearing to be confusing on first sight, follow several general rules. If the first letter is a 'A' through 'M' it refers to production month. All serial number records before 8/18/1948 were lost in a factory fire. For pre-1948 Schwinns try taking out the crankset to check for a date code. If you have a Schwinn from this era, please, PLEASE send us pictures of your bike and serial number ([email protected]). We are in the process of collecting pre-1948 serial. A serial number on the underside of a bottom bracket. Another serial number beneath the bottom bracket, aligned parallel to the frame. Some Schwinn bicycles have the unique identifying number on their head tube (which is on the front of the bike). A serial number located on a rear drop out.
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