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Headset question

Old 03-31-09, 02:29 PM
  #1  
jcrouse
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Headset question

I need to replace the original headset on my 1984 Raleigh Super Course. There are a number of nices ones on the market but I've seen some with the option of a 26.4 or 27.0 mm crown race diameter. Doesn anyone have any idea what I'd need for my Super Course? Also, why aren't these options listed for all 1" threaded headsets that I've seen? That seems a little odd to me.

Thanks!
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Old 03-31-09, 02:40 PM
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The only sure way to know what you'll need is to take your bike apart and make good measurements.

Next most certain is to buy a set taken off another identical bike.

Might check into Sheldon Brown's site, or if possible a Sutherland's manual.

As far as your last question, I'm not sure I understand it. Why do you need to see all options listed, if it wouldn't help you get what you need?
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Old 03-31-09, 02:52 PM
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I'm unfortunately not able to measure the crown race at this time so hopefully someone has some experience with this. As far as my second question, I was just curious. I just thought it would be strange to buy a headset that may or may not fit. There are apparently at least two different crown race diameters so it would be nice to know which one you were purchasing. I'd sure like to know what size I'm getting before I made a purchase. Maybe one of the two sizes I mentioned is pretty much the "standard" so most are only offered in one size. Just a guess though as I have no idea at all
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Old 03-31-09, 03:33 PM
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it could just be a difference in the size of bearings you put in em.... but i'm not sure.
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Old 03-31-09, 03:40 PM
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It's not random. I may have been misleading. Headsets are marked on their boxes when sold. I have a boxed NOS Tange Levin in front of me, and it has several numbers on the box: 1" x 24 BSC (defines the threads as English), and 26.4 x 30.2. The 26.4 is the diameter of the crown race seat. I think the 30.2 is the diameter of the fixed cup (upper and lower ones) section that presses into the head tube. It could also be the stack height; the Levin is a very short headset.

But this doesn't tell you what you need. If you know what you need, it lets you assess whether this Levin is usable.
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Old 03-31-09, 03:42 PM
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Originally Posted by deez View Post
it could just be a difference in the size of bearings you put in em.... but i'm not sure.
I'm pretty sure it's not the bearings. The expectation is that you'll use either the original bearings or equivalent, i.e. same size.
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Old 03-31-09, 05:37 PM
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Originally Posted by jcrouse View Post
There are apparently at least two different crown race diameters
That is correct.
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Old 03-31-09, 07:32 PM
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Originally Posted by jcrouse View Post
I've seen some with the option of a 26.4 or 27.0 mm crown race diameter.
Your options are the ISO spec 26.4 x 30.2 (crown race x cup diameter), or JIS spec 27.0 x 30.0. There are also some mongrel 27.0 x 30.2 headsets. JIS is Japanese so it mostly shows up on cheap Asian built bikes.

Originally Posted by jcrouse View Post
Doesn anyone have any idea what I'd need for my Super Course?
Measure. The crown race size is distinctly different.

Originally Posted by jcrouse View Post
Also, why aren't these options listed for all 1" threaded headsets that I've seen? That seems a little odd to me.
If you're looking on eBay, it is because many sellers don't know what they have.
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Old 03-31-09, 08:57 PM
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Originally Posted by laura* View Post
JIS is Japanese so it mostly shows up on cheap Asian built bikes.
I disagree that it is cheap Asian bikes in particular. Many pretty damn nice Japanese bikes have a 27.0 crown race.

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Old 03-31-09, 09:32 PM
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Originally Posted by laura* View Post


If you're looking on eBay, it is because many sellers don't know what they have.
Excellent point!!!!
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Old 04-01-09, 01:56 AM
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Thanks for the replies. I'll go ahead and measure it when I'm able and post the info so maybe it will be helpful to somebody else in the future. I noticed the lack of crown race diameter info. on a number of online bike websites.

Last edited by jcrouse; 04-01-09 at 02:00 AM.
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