Schwinn Serial Number Reference

[GTs58]

What does that mean?

The crank is the part that the pedals are attached to. If that's a 1976 or later there will be a four digit stamping on the Schwinn badge at the front of the bike, stamped next to the letter I. It will give you the day and last digit of the year the bike was built. DDDY.

 

[bloo]

What does that mean?

August 30, 1976.

The days are numbered from 1 through 365 in a normal year and 1 through 366 in a leap year. It's called a "Julian Calendar" or "Julian Day Table" in manufacturing, but then there is also a historical calender form called a "Julian Calendar" that won't help you, as well a "Julian Day" used in astronomy. They're all different things making this not an obvious Google.

1976 was a leap year.

Leap Years Here: https://pages.mtu.edu/~gbluth/Teaching/julian.leap.html

Normal Years Here: https://pages.mtu.edu/~gbluth/Teaching/julian.noleap.html

 

[mrg]

Pretty simple, 1976 model!

 

[SuperMirage]

I have what I believe is a Schwinn New World 194(?)x bicycle that I delivered newspapers on as a boy ~45 years ago after my parents purchased it from a neighborhood yard sale. In doing some research, what is a little different about this bicycle are the gears and the "CORNELL" on the rear fender.
Serial Number: D73017.

 

[GTs58]

I have what I believe is a Schwinn New World 194(?)x bicycle that I delivered newspapers on as a boy ~45 years ago after my parents purchased it from a neighborhood yard sale. In doing some research, what is a little different about this bicycle are the gears and the "CORNELL" on the rear fender.
Serial Number: D73017.


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Your work bike is a 1940 New World.

 

[Kickstand3]

Thought s
On year
Found both these cranks where I found this ride

 

[Raiders7566]

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

I just found a Arnold schwinn balloon tire bicycle I cant fUK and any information about it serial numbers start with an I HAS THE WORLD BADGE just dont know where to look if anyone's wants pictures let me know thanks

 

[bloo]

Post pictures and we can make a good guess..... post a pic of the serial number too.

 

[oimakoi]

Recently got this dx yesterday. Bottom bracket serial starts with an R.
R56228 or R66228 or R86228
What year might this be?
Here’s my post yesterday https://thecabe.com/forum/threads/crusty-dx-freshly-picked.211821/

 

[GTs58]

that's a lot of pages. is there a list somewhere of the accepted truth? one prewar list ended before this number came up ..

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No picture of the seat post clamp. Is it welded on, I have to assume so? The I series is 1942 and believe it or not, Schwinn started the electo-forging of the BB shells with the 1942 I series numbers. This is the first non-lightweight that I've seen with that detail! And a low SN, most of the New Worlds that had the EF shell had a 30000 number.