Prewar schwinn seatpost binder bolts....

[Bendix]

so, some prewar schwinn frames have the extended seat tube with a welded on clamp for the seatpost binder bolt and others have holes through the seatstays and a nearly flush seat tube/top tube. any rhyme or reason to when or what model these show up on? seems pretty random to me......(?)

here's what i'm talking about...

just wondering....

 

[matthotch]

from my experience they had the "through frame" pinch up until 35. 36 up they started the weld on. not 100% but pretty sure

 

[island schwinn]

matt,from my experience,you're right on the money.is this matt from hotmatch?

 

[Bendix]

huh. i saw in the 'american bicycle' book there was a pinch bolt equipped bike id'd as a '37 autocycle, the maroon bike in the photo is a '42 schwinn built bfg. i know there are some misidentified bikes in that book, but the bfg is definitely the late prewar frame style with both the curved downtube and slightly curved middle bar.......

 

[Xcelsior]

It sometimes depended on the frame size or length of the seat tube on those. Shorter seat tube would call for a "pinched" clamp. They could've been any year prewar really.

 

[matthotch]

Ya it's me. I got hooked on these damn bikes.

 

[prewarkid]

hole through seat stay is what catalogues refer to as the 16" Frame , post with clamp is the 18" Frame and the tall frame bikes is the 20" frame.. I have seen these shorter frames with the hole through the seat stay as late as 39. Hope this helps.

 

[Bendix]

now you've seen as late as '42!

i'll have to compare some dimensions of mine with the clamp type and see if anything changes other than the seat tube length. i have a copy of a detailed joe breeze frame geometry sketch to compare to...