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Fork Steerer Tube Diameter

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GrandmasterE

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Jan 25, 2003, 1:30:11 AM1/25/03
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Can anyone help me? I'm trying to figure out the diameter of
motocross fork steerer tubes, and the standard motocross headset size.
Does anyone have any helpful hints? A link to a dimensioned exploded
view dwg. would be ideal. C'mon folks, please!!

GrandmasterE

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Jan 25, 2003, 1:32:53 AM1/25/03
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I need some help: What is the steerer tube diameter for motocross
forks? And what are used for headset? Any links to pictures would be
extremely helpful.

Pete P.

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Jan 25, 2003, 8:11:29 AM1/25/03
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You're kidding, right?

There is no standard stem tube diameter. It varies from bike to bike.

Pete P.

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Hoyt McKagen

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Jan 25, 2003, 12:25:15 PM1/25/03
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Pete P. wrote:
>
> You're kidding, right?
>
> There is no standard stem tube diameter. It varies from bike to bike.
>

Often enough it will be 20-25 mm at top and 25-30 mm at bottom. Important
things to KIM: Bigger tubes are way stiffer and bigger bearings have way
more load capacity; fit is important (stems should be press-fitted into
bearings at bottoms and a good light drive fit at tops; wall thicknes is
as important if not moreso than dia, with good enough being about 4-5 mm
under thread roots at top and 6-7 mm at bottom, finally, aluminum stems
are usually wayyyy too limber for good handling.


Regards,

Hoyt McKagen

Belfab CNC - http://www.freeyellow.com/members/belfab/belfab.html
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My dog drove off in my pickup truck, but left my wife behind!!


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