CWC Seatpost Questions

[Krakatoa]

Does anyone know about what year CWC changed to a straight solid 5/8" inch post as opposed to a Lucky 7?

In a related question does anyone know about what year they dropped the two shims and just had a standard 5/8" opening in the seat clamp?

I'm guessing it happened late pre-war but I'm not positive, looking for more definitive information.

Thanks in advance,

Nate VT
401-548-9082

 

[fordmike65]

Guessing '41? This '41 had a straight 5/8" seatpost sans shims.

 

[saladshooter]

Very confusing topic for sure in regards to the no shim question. I can't stand the shims!!!!

Here is a 38 standard model with a SN of D14XXX WithOut shims

Here is a 38 Supreme model with a SN of D37XXX With shims..

 

[Krakatoa]

Good data to so far guys thank you. Let's get some more.

 

[saladshooter]

I have a FXXXXX DBR withOut shims

Also a GXXXXX "3Gill" style frame withOut shims.

 

[dogdart]

I have a D4xxxx ladies "A" model with shims an straight seat post, and a D5xxxx boys 3 gill without

 

[dogdart]

Adding to the confusion, I have a couple of Double Bar Roadsters with serials C71xxx and D15xxx both without shims.
So I don't think that the change can be defined by a date or serial number

 

[Krakatoa]

Actually I think this helps and everybody's input is worthwhile. I'm just looking at what's coming so far and you can too with the serial number chart. I'll try to compile some observations and post them once I've had a chance to study.

I guess what we'd be looking for would be the earliest examples of a shim less bike. Also if shim less and shimmed bikes existed in the same model year. It's very possible there was an overlap. And is there a year or time point after which shim type bikes cease to show up?

It may be more difficult to determine and likely less important when the straight seat post came into play but interesting nonetheless. Since it's an independent part we'd probably want to rely on data from the most original examples.

 

[ozzie]

My ‘39 4 gill had a lucky 7 post and shims. I can’t remember if the ‘53 (which I got from you) has shims but can check if
you like

 

[Oilit]

I picked this up last weekend, no shims.