Schwinn Serial Number Reference


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GTs58

Riding a '38 Autocycle Deluxe
Sep 2, 2012
7,892
5,277
Central Arizona
Your probably right Pete. And they probably used and recorded the serial number instead of stamping a new set of numbers.
 

Freqman1

Riding a '37 Dayton Super Streamline
Jul 14, 2009
15,090
14,819
Evans, GA
The bike is a '52. Post in the motorized section and you will get more answers regarding the Whizzer. V/r Shawn
 

Walking71214

On Training Wheels
Oct 27, 2016
1
0
47
Pomona CA.
image.jpeg
Could anyone help with decoding my serial number? Please thx. On the left of the schwinn plate it reads DU510512 and on the bottom of the cranks it has another serial #006 (sideways) 2 G . I've been looking and don't see any DU, and when I look it up its saying 1958. Thanks
 

Metacortex

Wore out three sets of tires already!
Sep 22, 2012
830
453
The Matrix
View attachment 648259 Could anyone help with decoding my serial number? Please thx. On the left of the schwinn plate it reads DU510512 and on the bottom of the cranks it has another serial #006 (sideways) 2 G . I've been looking and don't see any DU, and when I look it up its saying 1958. Thanks
The most important number is the 4-digit stamp on the headbadge (assuming it is original), which indicates the day the bike was built (please post close-up pics). The frame serial number indicates a head tube stamped in April 1983. Since that happened before the frames or bikes were built that could indicate a bike built right before the Chicago plants closed or one that was built by Murray for Schwinn in Lawrenceburg TN. Besides the head badge stamp, post pics of the bottom bracket housing, which will indicate whether this is a Chicago or Lawrenceburg bike.
 
Likes: Walking71214

GTs58

Riding a '38 Autocycle Deluxe
Sep 2, 2012
7,892
5,277
Central Arizona
Can anyone date the X00000 bottom bracket stamped post war Serial Numbers?

Thanks in advance.
 

Thonyv1974_

Wore out three sets of tires already!
Jun 11, 2016
685
1,375
Chicago, IL
1946 series Hxxxxx Ixxxxx Jxxxxx A0xxxx (small type face) Bxxxxx
Cxxxxx (low number)

Cxxxxx is probably a cusp number between 46 and 47. More on the 47 side.



1947 series Cxxxxx/Dxxxxx

1948 series Dxxxxx ect...

Identifying features:

Skinny drop outs (1946)
Razor edge fenders
Shortie rear fender(early 1946 rare)
light cover has deep rear screw hole
Raised or de bossed style AS clamp(rare)
Non scripted light lens
Tapered pencil kick stand
Canti frames have more of a hump to the top tube. (Early)
Straight bars ie "fat bars" have same dia bottom tubing. (This feature also was found on later years and is not solely indicative of a 1946)
Rack clamp is a one piece flat band aid shaped plate.
Rear top stay fender bracket is sometimes tubular on early frames. (I've only seen this on dx models). My 46 rear fender stay mount is taller and more boxy then late 40s 50s style.
Early 46 tanks have been seen with tapped brackets ie left over snap style prewar tanks.
Big outtie delta horn button and tank hole (prewar size).
Chain guard front frame mount tab is thinner with bigger hole.
Grips will be oval with one tail coming off N without double back crossover(late prewar style)
Rear chevron will be shorter on 46.
Drop center rims or sometimes Lobdell flat profile rims.
1946 bikes have been found with 1941 stamped dogleg cranks
skinny truss rods.
Springer pivot bolt rumored to be chrome on early 46?
Pivot clip was prewar style half clip.(early)
Springer fenders sported diamond and tombstone reinforcement tabs
Granted stuff got replaced or got carried over ie pencil stand.
Note; (A) serial started again in 51 but in regular larger print.
What I have gathered doing research and asking experts is that the I J and K serials would have been left over prewar BB shells and or frames that had already been stamped prior. A being the first true postwar serial. Hope this helps. Pm me if you have any further questions or would like to add something to the list. Thank you
Very helpful.
 

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