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Schwinn ISO vs JIS

Old 07-07-06, 10:01 AM
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thewhitestripe
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Schwinn ISO vs JIS

Did Schwinn outsource to Japan at any point in time? I have an unidentified cro-moly 1430 Schwinn frame with the serial number on the left drop out. What are the chances this is not ISO?

The emblem on the head tube says "Chicago."

Thanks so much for your help!
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Old 07-07-06, 10:08 AM
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If it is a JIS headset, and not a keirin bike, then the bike is best used for dockjumping, and doesn;t deserve a new headset.
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Old 07-07-06, 10:08 AM
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therefore, it is likely to be an ISO headtube
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Old 07-07-06, 11:14 AM
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Schwinn did outsource at least some frame construction to Giant in the late 70's.
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Old 07-07-06, 11:27 AM
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Yes, Schwinn outsourced to Japan on some models, from around '74, starting with the Le Tour (although some le tours were also made later in Chicago for a year or two, and then in Greenville, Mississippi later still), thru maybe the early nineties. The Japanese sources were Panasonic mostly, and Bridgestone some. Your Chicago headbadge means only that Schwinn's corporate headquarters were in Chicago at the time your bike was made, and that was the case thru the early nineties, I believe. They put "Chicago" badges on some models long after the Chicago manufacturing plant shut down, in late '83. Another USA plant, in Greenville, Missisippi, operated from '81 thru '91. During this time, various Schwinns were also made in Japan, China (China Bicycle), and Taiwan (Giant)..............I think what you'll probably find on your Schwinn in regard to the headset is that it will have an odd sized quill stem diameter, and a matching odd size on the inside diamter of the steerer tube. The dimension will probably be 21.15mm (usually marked .833" on the stem), instead of the more common 22.2mm used on 1" threaded fork assemblies. The headset cups, the threads on the fork, etc., will all be ISO, but the stem, inside diameter of the steerer, and the inside diameter of the top locking nut on the headset assembly will be .833". I've taken headsets off of Schwinns and used them on other bikes with 1" threaded forks, but I've had to sand out the inside diameter of the locking nut to allow the 22.2mm quill stem to slide through and down into the steerer. Hope this makes sense-

Last edited by well biked; 07-07-06 at 11:50 AM.
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Old 07-07-06, 03:54 PM
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Originally Posted by genericbikedude
If it is a JIS headset, and not a keirin bike, then the bike is best used for dockjumping, and doesn;t deserve a new headset.
i think the paramount road bikes used a JIS headset. those are definitely NOT worthless. hell, the pelotons are pretty snazzy too.
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Old 07-07-06, 05:02 PM
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most x-mart bikes use JIS headsets. the only good bikes with JIS headsets are fancy track bikes.
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Old 07-07-06, 05:54 PM
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Originally Posted by genericbikedude
most x-mart bikes use JIS headsets. the only good bikes with JIS headsets are fancy track bikes.
You hurt my ca. 77 Fuji Professional's feelings...
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Old 07-07-06, 08:02 PM
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Anyone know a source of a good quality JIS headset? I have an old 70's bike that I truly love to ride but the chip seal is eating the cheap Tange-Seiki headsets that seem to be the only available choice in the QBP catalog. I'm getting about 3 months out of a new headset before the dreaded index steering effect become unacceptable.

And yes, I am adjusting the headset correctly. I believe the crown race is just not hard enough to withstand the beating from brevet riding on Texas chip seal.
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Old 07-08-06, 04:53 AM
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Originally Posted by supcom
Anyone know a source of a good quality JIS headset? I have an old 70's bike that I truly love to ride but the chip seal is eating the cheap Tange-Seiki headsets that seem to be the only available choice in the QBP catalog. I'm getting about 3 months out of a new headset before the dreaded index steering effect become unacceptable.
And yes, I am adjusting the headset correctly. I believe the crown race is just not hard enough to withstand the beating from brevet riding on Texas chip seal.
Try www.harriscyclery.com

Ebay is also a good source

Or take it to a reputable bike shop and have the JIS crown race machined down to the ISO standard. You'll end up with more choices on headsets that way.....such as sealed bearings...Chris King's...etc....
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Old 07-08-06, 06:01 AM
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Generic, in this case you're showing an ungrounded bias. (Well, grounded in that nearly all non-Keirin bikes with JIS headsets are X-Mart pieces of *%&$.) But some late-70's and early-80's 27-in-wheeled road bikes are not bad machines, and take JIS headsets. I've got a couple of them myself, and they're nice (although not particularly light) frames. But some frames of that era were light as well.

Pretty much the only option you've got for replacement headsets are cheap (~$20 or less) steel JIS headsets. However, these are about what was used at the time, and are solid quality, and will work fine. Sheldon has some, and I see lots of eBay, although most of the time the sellers don't know what JIS and ISO standards are. So, you may have to keep replacing with the Tange...

The Schwinns are as well biked described them though, not usually JIS.
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Old 07-08-06, 08:29 AM
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Yep, I've got the remnants of one of the earliest Shogun PrairieBreaker mountain bikes in my basement, full chromoly Tange MTB tubing, wonderful lugwork, and the fork (also of Tange MTB chromoly) is about as cool as it gets, with a double-plate crown. Oh, and it takes a JIS headset.
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Old 07-08-06, 08:35 AM
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Originally Posted by genericbikedude
most x-mart bikes use JIS headsets. the only good bikes with JIS headsets are fancy track bikes.
Total nonsense.
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Old 07-08-06, 08:36 AM
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Originally Posted by supcom
Anyone know a source of a good quality JIS headset? I have an old 70's bike that I truly love to ride but the chip seal is eating the cheap Tange-Seiki headsets that seem to be the only available choice in the QBP catalog. I'm getting about 3 months out of a new headset before the dreaded index steering effect become unacceptable.

And yes, I am adjusting the headset correctly. I believe the crown race is just not hard enough to withstand the beating from brevet riding on Texas chip seal.
Get your head tube faced. If you're going through headsets that fast, something's not perfectly parallel...
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Old 07-08-06, 10:16 AM
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Originally Posted by brokenrobot
Originally Posted by genericbikedude
most x-mart bikes use JIS headsets. the only good bikes with JIS headsets are fancy track bikes.
Total nonsense.
No, not *total* nonsense. Nowadays the only good bikes that come with JIS headsets are Keirin bikes. Unless you have other examples, in which case it would have made your post worthwhile if you'd mentioned those examples.
As I noted above, in the late 70's and early 80's there *were* relatively nice road bikes that came with JIS headsets, so back then Generic's statement would have been total nonsense.

Originally Posted by brokenrobot
Get your head tube faced. If you're going through headsets that fast, something's not perfectly parallel...
I think you're right on this one. A cheap steel headset should still last a lot longer than three months. It's possible that the fork's crown race fitting needs to be faced, or that the head tube needs to be faced. [i]Of course, if you're going to get the fork and head tube faced, you may as well get them ground down from JIS to ISO standard, which is larger on the head tube and smaller on the crown race, so you can get from JIS to ISO by removing metal.

The other possible problem is that you get dirt into your lower headset race, and it grinds down the bearings and kills the crown race. Lizard Skins neoprane headset protector is useful to wrap around the lower race as a seal.
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Old 07-08-06, 10:23 AM
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Originally Posted by timcupery
No, not *total* nonsense. Nowadays the only good bikes that come with JIS headsets are Keirin bikes. Unless you have other examples, in which case it would have made your post worthwhile if you'd mentioned those examples.
As I noted above, in the late 70's and early 80's there *were* relatively nice road bikes that came with JIS headsets, so back then Generic's statement would have been total nonsense.
And I agree with your post above. You're just giving genericbikedude way more credit than I am. Unfortunately, he didn't say "the only current-manufacture bikes with JIS headsets are fancy Keirin bikes and xmart bikes" - he said those were the ONLY BIKES with JIS full stop, and there are TONS of very nice older bikes out there with JIS headsets. Nit-picking, I know - but the thread is about an older bike, and genericbikedude started off by proposing that any older Schwinn with a JIS headset was only good for "dockjumping" which you KNOW is total nonsense; many older Schwinns with JIS headsets are world-class rides even by comparison to modern bikes.
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Old 07-08-06, 10:36 AM
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Originally Posted by brokenrobot
And I agree with your post above. You're just giving genericbikedude way more credit than I am. Unfortunately, he didn't say "the only current-manufacture bikes with JIS headsets are fancy Keirin bikes and xmart bikes" - he said those were the ONLY BIKES with JIS full stop, and there are TONS of very nice older bikes out there with JIS headsets. Nit-picking, I know - but the thread is about an older bike, and genericbikedude started off by proposing that any older Schwinn with a JIS headset was only good for "dockjumping" which you KNOW is total nonsense; many older Schwinns with JIS headsets are world-class rides even by comparison to modern bikes.
Okay, gotcha. I agree.
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Old 07-08-06, 11:24 AM
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This 1987 Schwinn Super Sport is definitely not a "Dockjumper". It has an ISO headtube and a JIS crown race seat (Tange fork). I used a Tange Levin 30.2/27.0mm headset from Bicycle Parts Etc. If it wears out sooner than I think a $20 headset should, I will probably have the steerer tube machined and install a better headset. Having to deal with non standard parts is not a good enough reason to turn your back on these older bikes. This Columbus Tenax frame was manufactured in 1987 but never built up. I gladly paid $150.00 for it. There is no way you can get that quality in a new manufactured frame at that price today.



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