The -OS frame style seems to have been completely replaced by the more curvaceous -6 style by 1946. The DX style frames have a lower top-tube (for lack of a better name) that curves ever so slightly, however the chainstays on the Schwinn D97XE-OS (1939-41) run roughly parallel to the ground while the chainstays on the D97XE-6 (1941) and the D-13 (1953) droop slightly as they travel from the rear dropouts to the bottom bracket. 1948 1951 The DX frames were part of the Schwinn line by 1939. (CT = Cycletruck WZ, S-10 = Whizzer Tdm = Tandem.) Schwinn's built-in kickstand was introduced in 1946. We are in the process of collecting pre-1948 serial numbers in the hopes of rebuilding the date code system for this period. If you have a Schwinn from this era, please, PLEASE send us pictures of your bike and serial number ().ĭownload Lagu Pencinta Wanita. For pre-1948 Schwinns try taking out the crankset to check for a date code. All serial number records before were lost in a factory fire. From 1958 on, several different coding systems were used, from which the manufacture date (and often the assembly date) can be decifered. User Name: * Password: * Schwinn Serial Numbers and Date Codes Dates between 19 are available because Schwinn kept good records.