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Old 01-04-06, 10:08 AM   #1
MikeyA101
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Steerer Tube Length

I am quite new to biking and would be grateful of some advice.
I have a suspension fork on my bike at the moment that I want to switch for a rigid, what I want to know is how long does the steerer tube need to be. I haven't taken the old one off(I know that would be easiest, just to measure the old one.) But could you tell me how much longer than headtube it would need to be for example. I'm not sure how headsets work/attach so can't figure out how much longer than the headtube it would need to be. I have been looking around on e-bay etc but don't want to get one that is too short.
I know this may seem like a stupid question and probably is but like I said I am new to this game.

Thanks for your time
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Old 01-04-06, 10:46 AM   #2
531Aussie
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it depends a bit on what headset and stem you're using, if it's threaded or not, and whether or not it's integrated, but, for example, my threadless, non-integrated headsets have a stack height of ~32mm, and all my stems are 40mm high.

So, that's obviously just an example; and remember that the stem doesn't completely cover the top of the steerer.
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Old 01-04-06, 11:24 AM   #3
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That's not such a stupid question. But it's a very hard one to answer. Like 531Aussie says, it depends on a lot of things. In general, no mechanic will answer that until they take out your old fork and measure it...it's how we'd have done it in any shop I worked in. That being said, if you guesstimate its length while installed, it's better to err on the long side, since the steerer can be cut.
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Old 01-04-06, 11:48 AM   #4
biker7
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Quote:
Originally Posted by MikeyA101
I am quite new to biking and would be grateful of some advice.
I have a suspension fork on my bike at the moment that I want to switch for a rigid, what I want to know is how long does the steerer tube need to be. I haven't taken the old one off(I know that would be easiest, just to measure the old one.) But could you tell me how much longer than headtube it would need to be for example. I'm not sure how headsets work/attach so can't figure out how much longer than the headtube it would need to be. I have been looking around on e-bay etc but don't want to get one that is too short.
I know this may seem like a stupid question and probably is but like I said I am new to this game.

Thanks for your time
Acount for 10mm under the steerer tube and 10mm above for the headset bearing races...a bit less then that but that is a conservative number. Then add 30mm or so for spacers under the stem and about 40mm for the clamping height of a typical stem. In total you want a fork steerer about 90mm longer then your head tube. If you can find one longer then that...ideal as you can always cut the steerer tube down. The thing I always look hard at when buying a frameset is how much fork steerer sticks above the head tube as I like to run about 30mm of spacers under my stem.
HTH,
George
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Old 01-04-06, 09:44 PM   #5
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Quote:
Originally Posted by biker7
Acount for 10mm under the steerer tube and 10mm above for the headset bearing races...a bit less then that but that is a conservative number.
i just did a quick search on QBP, and most of the stack heights listed are more than 25 mm...
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