elusive S-4 Baloon tire

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rennfaron

Wore out three sets of tires already!
There was an S-4 for a short period in the 50s. It came on the welterweight and tandems (which is why the heavy duty spokes).

Either way the seller doesn't care because I messaged them and said that's not a "baloon" tire, it's specific to two models. No update to the listing.

Attached: "Rims: Schwinn built, tubular, chrome plated, S-4"
IMG_4070.jpg
 

rennfaron

Wore out three sets of tires already!
I thought they changed out at some point in the 50s. I looked at the '61 catalog and it still says S-4 for the tandem/T&C. I thought you would see more S-4 rims turn up, but I guess the tandems were still pretty low numbers in production compared to all others.
 

rustjunkie

. . . . . . .
Moderator
I messaged this guy to explain never was a S-4 and that he has a S-7 and he is looking at the 7 upside sown and the S is the start of the next Schwinn marking. Either doesn't know or doesn't care. Don't miss out on this one of a kind baloon tire hahahaha

looks like straight-gauge spokes and a 1950s new departure hub, the ad @rennfaron posted specs morrow, but nd was likely available as well
 

GTs58

I'm the Wiz, and nobody beats me!
I thought they changed out at some point in the 50s. I looked at the '61 catalog and it still says S-4 for the tandem/T&C. I thought you would see more S-4 rims turn up, but I guess the tandems were still pretty low numbers in production compared to all others.

The S-4 is on the 1948 Tandem specs and that was probably the first year for that rim. The highest T&C serial number that I've come across was a high 5K number. They used the tandems pre-stamped BB shells on many of the early post war lightweights so the actual number produced was nowhere near 5000.
 

coasterbrakejunkie1969

Riding a '38 Autocycle Deluxe
There was an S-4 for a short period in the 50s. It came on the welterweight and tandems (which is why the heavy duty spokes).

Either way the seller doesn't care because I messaged them and said that's not a "baloon" tire, it's specific to two models. No update to the listing.

Attached: "Rims: Schwinn built, tubular, chrome plated, S-4"
View attachment 1668915
I did not know that, I'm learning. Did the S-4 have knurling like that? What is the difference between S-4 and S-7? Did the S-4 use a standard tire or Schwinn specific?
 

rustjunkie

. . . . . . .
Moderator
The S-4 is on the 1948 Tandem specs and that was probably the first year for that rim. The highest T&C serial number that I've come across was a high 5K number. They used the tandems pre-stamped BB shells on many of the early post war lightweights so the actual number produced was nowhere near 5000.

what hub was typically on the tandems?
 

rennfaron

Wore out three sets of tires already!
I did not know that, I'm learning. Did the S-4 have knurling like that? What is the difference between S-4 and S-7? Did the S-4 use a standard tire or Schwinn specific?
Yep they had knurling like shown in that ebay link you posted. There are some early 50s S-6 rims that have that same knurling pattern.

No idea on difference because I don't collect any bikes with S-7s. @GTs58 I am sure knows.

At the time these are the tires you got on them. Hard to find.
 
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