Need Help 1920's Hawthorne BB cup size

[Motoman]

Greetings sure could use some help with a Hawthorne early 1920's bicycle BB race cup sizing. Did Hawthorne use pre-war Schwinn cups? Mine has Schwinn crank, cones and bearings 10 x5/16 Would like to replace worn race cups. Any info much appreciated

 

[J-wagon]

I might have BB cups that mate to your bearings. Are bearings #66 or equivalent? If no stamping, what is retainer outer diameter?
There also another 10 ball 5/16" retainer that smaller outer diameter vs 66. Both have 10 ball 5/16 but different diameter so cups not interchangeable

 

[Archie Sturmer]

There is information in the Paper Archive and about ball bearings around page 6:

Paper Archive: Catalogs, Instructions, Schematics. Non-Discussion Thread | General Discussion About Old Bicycles

A couple of bearing charts showing what each maker used. First from Chicago Cycle Supply 1938. Second from 1950 catalog.

thecabe.com

Perhaps post a picture of the 1920’s Wards Hawthorne so that members might be better able to help; (by better understanding the maker of the bicycle).

 

[Motoman]

OD 50.3mm ID 40.4mm -28 tpi SA crank, Hartford #66 bearings, cones are Schwinn. Cups not sure of no markings Thanks for all the help

 

[Motoman]

Chain ring not original to bicycle old skip tooth Schwinn 26t sweet heart teeth were worn so replaced with a NOS prewar Wald.

 

[J-wagon]

Schwinn crank stuff on non schwinn can be confusing. Schwinn BB bearings depending on years we're either 10 ball (66) or 9 ball (64), here some approx dates:
Post in thread 'Schwinn BB bearings 64 to 66' https://thecabe.com/forum/threads/schwinn-bb-bearings-64-to-66.202693/post-1398255

If you have 66 bearings, hopefully your current crankarm / fixed and adjusting cones are corresponding for proper seating fit. Crankarm cones for 64 will not sit correctly on 66 bearings, vice versa.

Assuming your bearings and crankarm cones match, here are some measurements for 66 BB cups. Cups for 66 bearings are abundant.

 

[J-wagon]

For reference, here are 9 ball bearing retainer measurements, some schwinn crankarm/cones used 9 ball. The 9 ball BB cup has a small diameter at seating depth.

 

[Motoman]

Thank you so much for the great pictures on where to measure and all the informative information about bearings and cups. This is so educational