Tire question

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Ernbar

Finally riding a big boys bike
Jul 12, 2019
363
66
Central Florida
I ordered some 27 X 1 1/14 tires for one of my 1980's Schwinns and the tires seem to be out of round making a thump or bump as they rotate. I contacted the seller and he told me those 27 X 1 1/14 tires do not fit older Schwinns, but need them to fit to fit S6 or K2 rims. As far as I know, 27 X 1 1/14 is a common size.
 

Gordon

I live for the CABE
May 22, 2006
1,978
Ottertail, MN
Pretty sure I have used that size tire on older Schwinn rims. Are the beads seated evenly? Some dish soap around the bead when mounting can make a big difference.
 
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GTs58

I'm the Wiz, and nobody beats me!
Sep 2, 2012
11,972
Central Arizona
So we are talking about S-6 tubulars? Are the tires marked ISO 32-650 ? I have never had the problem some have had with the China tires but there's always a first time. Beading the tire correctly is the key. Sometimes it takes a few shots of inflating deflating and massaging the tire to seat evenly. Having a clean rim with no rust on the sides also helps and I also use Windex to help with the beading.
 

Brutuskend

I live for the CABE
Apr 3, 2011
1,256
Eugene / Springfield Oregon
If you were trying to mount 27 1/4 tires on a s-6 rim they wouldn't even come close to fitting. If the rims are steel 27 inch rims, a lot of the time it is next to impossible to get them to seat evenly all the way around. First, make sure there is no rust on bead. Then use soap or they do make a product to help seat the tires. I have had better luck with dish soap. Most times, you have to inflate the tires above max pressure to get them to seat evenly. They also make a tool something like pliers to grab the tire and pull it up from the area the tire is seated too low in. Basically mounting tires on old school steel rims is a PITA. Good luck!

26740.jpg
 
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OldSkipTooth

Cruisin' on my Bluebird
Aug 6, 2015
3,553
Sebastopol, United States
This may or may not help, but I recently discovered that if you try to double up on spoke protectors it can push the tube and tire and cause to not seat correctly, and or have high low bumps.
 

GTs58

I'm the Wiz, and nobody beats me!
Sep 2, 2012
11,972
Central Arizona
If you were trying to mount 27 1/4 tires on a s-6 rim they wouldn't even come close to fitting. If the rims are steel 27 inch rims, a lot of the time it is next to impossible to get them to seat evenly all the way around. First, make sure there is no rust on bead. Then use soap or they do make a product to help seat the tires. I have had better luck with dish soap. Most times, you have to inflate the tires above max pressure to get them to seat evenly. They also make a tool something like pliers to grab the tire and pull it up from the area the tire is seated too low in. Basically mounting tires on old school steel rims is a PITA. Good luck!

26740.jpg
Say what!? I never had a problem and I have 5 or so Varsitys with S-6's and few Continentals. I have had problems with the cheap asp China inner tubes though. Those tubes are total junk and can easily cause a problem.

1964 Varsity Completed 001.jpg


1964 Varsity Completed 004 (Large).jpg


1964 Varsity Completed 012 (Large).jpg
 

Brutuskend

I live for the CABE
Apr 3, 2011
1,256
Eugene / Springfield Oregon
You mean rims strips?
Those things behind the free wheels are usually called spoke protectors. Or "pie tins"
 

Brutuskend

I live for the CABE
Apr 3, 2011
1,256
Eugene / Springfield Oregon
Say what!? I never had a problem and I have 5 or so Varsitys with S-6's and few Continentals. I have had problems with the cheap asp China inner tubes though. Those tubes are total junk and can easily cause a problem.

1964 Varsity Completed 001.jpg


1964 Varsity Completed 004 (Large).jpg


1964 Varsity Completed 012 (Large).jpg
Well when I usually see s-6 wheels they are the 26×1 3/8 size wheels. Though Schwinn made S-6 & S-5 / S-7 / S-2 Wheels in 16 20 24 and 26 inch wheels I have never seen, as far as I can remember, S-6 27 inch wheels. Though they may be out there. The ISO on 26 x 1 3/8 wheel is way smaller than a 27 inch wheel. 570 or 571 is the ISO for schwinn 26 inch s-6 rims I think. The English 26 x 1 3/8 is different than the Schwinn but I get them turned around in my head.
 

Ernbar

Finally riding a big boys bike
Jul 12, 2019
363
66
Central Florida
Hey guys thanks for your input. I’m gonna try the soap thing and re mount to see what happens.

A couple of months back I put new Kenda 27x 1 1/4 tires on my 74 Le Tour and she rolls smooth as silk. These Are not Kendas so that may be the difference in lower quality Chinese junk. That is my bad.

Gt love that green Varsity!
 

GTs58

I'm the Wiz, and nobody beats me!
Sep 2, 2012
11,972
Central Arizona
Starting in 1963 the Varsity model was equipped with the 27" S-6 rim and used that rim for decades. The later Continentals also used that rim when Schwinn began counting beans.
 
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Brutuskend

I live for the CABE
Apr 3, 2011
1,256
Eugene / Springfield Oregon
Good to know. I have been working in shops for about 40 years and I don't think I have ever seen a 27 inch s stamped rim. But then I probably have and just forgot. Weed is legal here in Oregon....

Not that "I" ever used it mind you.

Since the vast majority of s-6 rims I see are 26 1 3/8 rims, that is where my mind automatically goes when I think s-6 rims. Sorry for the misunderstanding.
 

SKPC

I live for the CABE
Feb 2, 2018
1,464
63
Utah - United States
Yes, a sticky rim-to-tire interface can cause an out of round and not properly seated tire, especially if pressured up too fast. If not lubricated it will not cleanly seat. 1st, soap/water or silicone spray the tire bead both sides, then initially put 10-15 lbs of air pressure. Spin the tire to see how it looks. Rarely is the tire bad. If it is not running clean, then push/massage the tire into the rim deeper until it runs good. Then pressure it up.
 

Ernbar

Finally riding a big boys bike
Jul 12, 2019
363
66
Central Florida
Well the soap and re seat/massage thing didn't work. Fred Flintstone's car has a smoother ride than these tires..
 
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GTs58

I'm the Wiz, and nobody beats me!
Sep 2, 2012
11,972
Central Arizona
What tires are you dealing with? My Lime 64 has CST HP's and those actually slipped right on the first round and fit better than the Kenda's. When I put new Kenda tires on my 61 Continental I replaced the original tubes with the Kenda tubes. The original tubes were 3X thicker but the valve stems had a leaking issue at the base. I usually inflate a new tube with a few pounds before installing and I bout crapped my pants when these cheap tubes had 5 psi in them! They were all deformed and didn't even come close to fitting the rim. They were stamped 27" but these things would fit a 32" or larger rim! The originals fit the rim perfectly. Keeping these tubes from bunching up or getting pinched when inflating and seating the tire was a real PITA. So, are your tubes new cheapo's or good ole USA originals?
 

Ernbar

Finally riding a big boys bike
Jul 12, 2019
363
66
Central Florida
Ok great news......I took the tires off and used the old tubes I saved that were originally on the bike and are marked 28” and some other junk. I inflated the tubes to 95 psi and the tires are 98% better. The tubes included with the tires are too thin compared to the original ones on the bike. Took her out for a test run and it’s 98% better so close enough for me so thanks for all the suggestions.
Gt the tires are made by Duro in Thailand. I should have gone with Kendas or the CST ones but lesson learned. I couldn’t find any markings at all on my rims except for the multiple line pattern running along the center of the rim.
 

PCHiggin

Riding a '38 Autocycle Deluxe
Jan 22, 2008
4,032
Ryderwood, United States
Well when I usually see s-6 wheels they are the 26×1 3/8 size wheels. Though Schwinn made S-6 & S-5 / S-7 / S-2 Wheels in 16 20 24 and 26 inch wheels I have never seen, as far as I can remember, S-6 27 inch wheels. Though they may be out there. The ISO on 26 x 1 3/8 wheel is way smaller than a 27 inch wheel. 570 or 571 is the ISO for schwinn 26 inch s-6 rims I think. The English 26 x 1 3/8 is different than the Schwinn but I get them turned around in my head.
The 27" lightweight rim was a "NARROW" S-6........
1566818195128.jpeg
 

PCHiggin

Riding a '38 Autocycle Deluxe
Jan 22, 2008
4,032
Ryderwood, United States
Well,They cant be like #3 and be 27" ers? You probably had a narrow tube, not made for your rims. Follow the above steps for mounting and you'll figure it out. Good luck
 
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