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Newbie confused about headset and steerer tube sizes

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Newbie confused about headset and steerer tube sizes

Old 05-18-11, 11:06 PM
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PandaSPUR
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Newbie confused about headset and steerer tube sizes

Hey everyone, this is my first post but I've lurked around here for a little bit.

I'm planning on building my own bike and have most of the components I want figured out, but the headset and fork are giving me some confusion.

The frame I ordered lists 1-1/8" as the headset size it accepts.
(frame: https://www.nashbar.com/bikes/Produc...oductId=516649 )
So that answers what size headset I need, but what size steerer tube do I need?
Am I supposed to get 1" so it fits in the 1-1/8" headset? or do I get the same size (so a 1-1/8" steerer tube).

It seems like such a basic question, but I dont see it documented anywhere and I am a complete newbie when it comes to bike mechanics.
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Old 05-18-11, 11:49 PM
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laura*
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Originally Posted by PandaSPUR View Post
or do I get the same size (so a 1-1/8" steerer tube).
Get 1-1/8" parts all around (fork/steerer, headset, stem). The actual sizes may vary, but they'll be meant to work with a 1-1/8" steerer tube OD.
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Old 05-19-11, 05:22 AM
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Originally Posted by laura* View Post
Get 1-1/8" parts all around (fork/steerer, headset, stem). The actual sizes may vary, but they'll be meant to work with a 1-1/8" steerer tube OD.
Yes, the OP needs a 1-1/8" steerer to match the 1-1/8" frame and headset but, unusual for the bike industry, all 1-1/8" headsets and steerers have the same dimensions. Unlike 1" headsets and forks where there are ISO and JIS sizes that are close-but-no-cigar.
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Old 05-19-11, 10:43 AM
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Ah... i see
This was pretty damn confusing lol, thanks for the advice guys.
And just to make sure, the frame I ordered doesnt specify whether its a traditional, semi, or fully integrated headset, should I assume its traditional?

EDIT:

Oh and another thing, my friend told me its not worth it for me to go buy a steerer tube cutting guide since I'd only use it once. He said I could just cut it roughly and sand it down later. What do you guys think?

Last edited by PandaSPUR; 05-19-11 at 10:49 AM.
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Old 05-19-11, 12:54 PM
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Originally Posted by PandaSPUR View Post
And just to make sure, the frame I ordered doesnt specify whether its a traditional, semi, or fully integrated headset, should I assume its traditional?
Do they show a picture of it built up? If so, do you see headset cups? If so, then it has traditional external cups.

Originally Posted by PandaSPUR View Post
Oh and another thing, my friend told me its not worth it for me to go buy a steerer tube cutting guide since I'd only use it once. He said I could just cut it roughly and sand it down later.
Use a piece of tape as a guide to indicate squareness. Or the cardboard tube from a roll of toilet paper. Or, hmmm...

(grabs calipers and measures)

... a plastic SRAM cassette bobbin has an ID of 1-1/8" at the bottom! Slide that over the steerer.
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Old 05-19-11, 01:15 PM
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One of the other BF's had suggested using hose clamp as a guide. Also I don't normally cut a steer tube until after the bike is completely built and I have ridden it a while, so I know where I like the fit. I don't like the idea of cutting off too much steerer, I also like to keep an extra inch of steerer anticipating that I will raise the bars sometime.
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