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Understanding Headset Specs

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Understanding Headset Specs

Old 03-11-18, 10:28 AM
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Quiglesnbits
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Understanding Headset Specs

Hello,

I am on a quest to understand headset nomenclature and specs, and I ran into a frame with a Headset spec listing that has me confused.

It says "1-1/8", tapered, IS 47/33". From reading a few articles, it seems like the IS47/33 is a lower bearing spec for a 1-1/4" tapered fork, but I am unsure how to know what upper bearing would work on this frame. Is 1-1/8" a pretty standard upper bearing size? Do I not need to know any other bore sizes, angles or anything else? To my untrained eye, this doesn't seem like enough information. Can you help me understand what I am missing?
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Old 03-11-18, 11:57 AM
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fietsbob 
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Pictures speak volumes..

integrated headsets are 1 type, those with press in bearing holders .. another..

1& 1/8th " typically is the fork steerer outside diameter.. it may be threadless or threaded.. those use separate headset types..

I have a bike with each style .. of the 3..



do you own a digital caliper yet? then you can measure things..


there are now tapered steerers ... bigger at the bottom than the top, and there are tapered roller bearings ..

Bene Sugg; pick up a book on bike mechanics.. Lennard Zinn wrote separate books for road & MTB bikes








...

Last edited by fietsbob; 03-11-18 at 12:04 PM.
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Old 03-11-18, 12:23 PM
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Originally Posted by Quiglesnbits View Post
Hello,

I am on a quest to understand headset nomenclature and specs, and I ran into a frame with a Headset spec listing that has me confused.

It says "1-1/8", tapered, IS 47/33". From reading a few articles, it seems like the IS47/33 is a lower bearing spec for a 1-1/4" tapered fork, but I am unsure how to know what upper bearing would work on this frame. Is 1-1/8" a pretty standard upper bearing size? Do I not need to know any other bore sizes, angles or anything else? To my untrained eye, this doesn't seem like enough information. Can you help me understand what I am missing?
That is not a complete headset spec - though it probably is such a common spec that it is used on quite a few bikes. But you would likely need to measure some things on the frame before you bought a headset.


This is a good tool to understand headsets:
https://blue.canecreek.com/headset-fit-finder


Do you need to know that spec? Usually framesets with integrated headset bearings come with all the parts.
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Old 03-11-18, 01:06 PM
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Quiglesnbits
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Originally Posted by Kontact View Post
Do you need to know that spec? Usually framesets with integrated headset bearings come with all the parts.
Thanks for the link, this is the bike in question: https://www.focus-bikes.com/de_de/42...ce-al-105.html

I was just sort of exploring today and it stood out to me as something that didn't seem like quite enough information to really know what the headset actually was.
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