1. Schwinn bicycle serial numbers are located on the underside of the bike, on the opposite side of the location of the service sticker. This is the metal space that connects the pedals. Schwinn serial numbers begin with 'IBD' or 'SN,' followed by 11 alphanumeric characters.
2. It mostly was Schwinn, who relied on Armstrong cranks for even their best bicycles until the late 1970's. If you saw a 3 piece crank on a Schwinn, it was most likely a Paramount, a truly fine product. All the grocery store and hardware store and department store bicycles had Armstrong cranks as well.
3. Bikes catalogs parts history serial numbers # Vintage Schwinn Bikes Most models of Schwinn bikes have years of images and information via old catalogs, advertisements and Schwinn documentation. 1955 Original Chicago Schwinn Starlet - vintage Schwinn bicycle for sale. Specifications FRAME- Schwinn girls balloon. FORK- Forged, chrome truss rods.
4. The bike has a head badge that says Shwinn Chicago. It is a Cruiser 5. The serial number is BV 10052. I can not locate BV serial numbers and for all purposes the lists stop at 1982.

Print, copy, or post anywhere you like.

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But it is worth remembering this peculiar little chapter in the story ofInformation for this article came from interviews with members of the Schwinn Bicycle Company (conducted in 1989), Schwinn Consumer Relations, the Schwinn History Center in Chicago, several Schwinn Bicycle Shops, Schwinn catalogs, and Mr. Robert Evans.

Serial numbers are now on the lower left of the head tube, by the Schwinn badge on front of the frame

————————————————————————————————————–

Numbering system:

The first letter is the month, the second letter is the year.
I and O are skipped so as to avoid confusion with 1 and 0.Examples:
AF***** = Jan. 1970,….. (“A” = Jan., “F” = 1970)
GL***** = July. 1975,….. (“G” = July., “L” = 1975)
MR***** = Dec. 1980,….. (“M” = Dec., “R” = 1980), etc.
—————————————————————————————————————

JANUARY, —————————- AF*****
FEBRUARY, ————————– BF*****
MARCH, ——————————- CF*****
APRIL, ——————————— DF*****
MAY, ———————————– EF*****
JUNE, ———————————- FF*****
JULY, ———————————- GF*****
AUGUST, —————————– HF*****
SEPTEMBER, ————————- JF*****
OCTOBER, ————————— KF*****
NOVEMBER, ————————- LF*****
DECEMBER, ————————- MF*****

JANUARY, —————————- AG*****
FEBRUARY, ————————– BG*****
MARCH, ——————————- CG*****
APRIL, ——————————— DG*****
MAY, ———————————– EG*****
JUNE, ———————————- FG*****
JULY, ———————————- GG*****
AUGUST, —————————– HG*****
SEPTEMBER, ————————- JG*****
OCTOBER, ————————— KG*****
NOVEMBER, ————————- LG*****
DECEMBER, ————————- MG*****

JANUARY, —————————- AH*****
FEBRUARY, ————————– BH*****
MARCH, ——————————- CH*****
APRIL, ——————————— DH*****
MAY, ———————————– EH*****
JUNE, ———————————- FH*****
JULY, ———————————- GH*****
AUGUST, —————————– HH*****
SEPTEMBER, ————————- JH*****
OCTOBER, ————————— KH*****
NOVEMBER, ————————- LH*****
DECEMBER, ————————- MH*****

JANUARY, —————————- AJ*****
FEBRUARY, ————————– BJ*****
MARCH, ——————————- CJ*****
APRIL, ——————————— DJ*****
MAY, ———————————– EJ*****
JUNE, ———————————- FJ*****
JULY, ———————————- GJ*****
AUGUST, —————————– HJ*****
SEPTEMBER, ————————- JJ*****
OCTOBER, ————————— KJ*****
NOVEMBER, ————————- LJ*****
DECEMBER, ————————- MJ*****

JANUARY, —————————- AK*****
FEBRUARY, ————————– BK*****
MARCH, ——————————- CK*****
APRIL, ——————————— DK*****
MAY, ———————————– EK*****
JUNE, ———————————- FK*****
JULY, ———————————- GK*****
AUGUST, —————————– HK*****
SEPTEMBER, ————————- JK*****
OCTOBER, ————————— KK*****
NOVEMBER, ————————- LK*****
DECEMBER, ————————- MK*****

JANUARY, —————————- AL*****
FEBRUARY, ————————– BL*****
MARCH, ——————————- CL*****
APRIL, ——————————— DL*****
MAY, ———————————– EL*****
JUNE, ———————————- FL*****
JULY, ———————————- GL*****
AUGUST, —————————– HL*****
SEPTEMBER, ————————- JL*****
OCTOBER, ————————— KL*****
NOVEMBER, ————————- LL*****
DECEMBER, ————————- ML*****

JANUARY, —————————- AM*****
FEBRUARY, ————————– BM*****
MARCH, ——————————- CM*****
APRIL, ——————————— DM*****
MAY, ———————————– EM*****
JUNE, ———————————- FM*****
JULY, ———————————- GM*****
AUGUST, —————————– HM*****
SEPTEMBER, ————————- JM*****
OCTOBER, ————————— KM*****
NOVEMBER, ————————- LM*****
DECEMBER, ————————- MM*****

JANUARY, —————————- AN*****
FEBRUARY, ————————– BN*****
MARCH, ——————————- CN*****
APRIL, ——————————— DN*****
MAY, ———————————– EN*****
JUNE, ———————————- FN*****
JULY, ———————————- GN*****
AUGUST, —————————– HN*****
SEPTEMBER, ————————- JN*****
OCTOBER, ————————— KN*****
NOVEMBER, ————————- LN*****
DECEMBER, ————————- MN*****

JANUARY, —————————- AP*****
FEBRUARY, ————————– BP*****
MARCH, ——————————- CP*****
APRIL, ——————————— DP*****
MAY, ———————————– EP*****
JUNE, ———————————- FP*****
JULY, ———————————- GP*****
AUGUST, —————————– HP*****
SEPTEMBER, ————————- JP*****
OCTOBER, ————————— KP*****
NOVEMBER, ————————- LP*****
DECEMBER, ————————- MP*****

JANUARY, —————————- AQ*****
FEBRUARY, ————————– BQ*****
MARCH, ——————————- CQ*****
APRIL, ——————————— DQ*****
MAY, ———————————– EQ*****
JUNE, ———————————- FQ*****
JULY, ———————————- GQ*****
AUGUST, —————————– HQ*****
SEPTEMBER, ————————- JQ*****
OCTOBER, ————————— KQ*****
NOVEMBER, ————————- LQ*****
DECEMBER, ————————- MQ*****

JANUARY, —————————- AR*****
FEBRUARY, ————————– BR*****
MARCH, ——————————- CR*****
APRIL, ——————————— DR*****
MAY, ———————————– ER*****
JUNE, ———————————- FR*****
JULY, ———————————- GR*****
AUGUST, —————————– HR*****
SEPTEMBER, ————————- JR*****
OCTOBER, ————————— KR*****
NOVEMBER, ————————- LR*****
DECEMBER, ————————- MR*****

Arnold Schwinn Bicycles Serial Numbers

JANUARY, —————————- AS*****
FEBRUARY, ————————– BS*****
MARCH, ——————————- CS*****
APRIL, ——————————— DS*****
MAY, ———————————– ES*****
JUNE, ———————————- FS*****
JULY, ———————————- GS*****
AUGUST, —————————– HS*****
SEPTEMBER, ————————- JS*****
OCTOBER, ————————— KS*****
NOVEMBER, ————————- LS*****
DECEMBER, ————————- MS*****

JANUARY, —————————- AT*****
FEBRUARY, ————————– BT*****
MARCH, ——————————- CT*****
APRIL, ——————————— DT*****
MAY, ———————————– ET*****
JUNE, ———————————- FT*****
JULY, ———————————- GT*****
AUGUST, —————————– HT*****
SEPTEMBER, ————————- JT*****
OCTOBER, ————————— KT*****
NOVEMBER, ————————- LT*****
DECEMBER, ————————- MT*****————————————————————————————————-

During the 1980s, Greenville used the old letter-digit
(e.g. F8 = June 1988) system which Chicago stopped using in 1965,
changing to the two-letter system.For newer bikes:
there’s a 4 digit serial number lightly stamped onto the headbadge.
The first three digits are the numerical day of the year,
and the last digit is the last digit of the year.

Schwinn Chicago Serial Numbers Online

Example:
3654 is 12/31/84 or 94 or (?).