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Old 08-26-08, 02:43 AM   #1
aznzero
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Determining proper headset size...

I may have phrased the thread name wrong- if so sorry. I'm quite new to the workings of a bike so I do not really know so much. A few weeks back I purchased a frame not knowing too many details of it(none were provided and the seller didn't answer the questions). So I received the frame hoping to build it up- but lacked some info. I didn't know what size fork/headset it required! Of course I did as much research and measuring as I could with the supplies I had(basically a ruler). At first I thought the frame took a 1 1/8" fork because the diameter of the opening was 1 3/16"(or so) but thought, "damn that would make a REALLY tight fit for the fork even without the headset in there!". Did a bit more researching and my measurements seemed to match up with a 1" headset/fork- can anyone confirm/deny this thought?
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Old 08-26-08, 09:59 AM   #2
bikeman715
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the inter diameter of your head tube should be 1/100" larger than the lip's outer diameter of the cup/race than will be press in to it. bigger the tube , bigger the cups will be. therefore the wider the steering tube will be. the best tool to use here would be calipers and measure the opening in 4 points and take the adv. of them.
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Old 08-26-08, 12:11 PM   #3
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Everything you've ever wanted to know about headsets:

http://www.parktool.com/repair/readhowto.asp?id=68

At the bottom is a list of dimensions to measure in determining headset sizing. Having the right tools to measure headset dimensions is critical. For just $2, you can pick up a set of calipers that'll let you determine the difference between 30.2 vs. 30mm and 26.4mm vs. 27.0mm. Harbour Freight - Centech 6" Utility Caliper.


Last edited by DannoXYZ; 08-26-08 at 12:14 PM.
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