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Old 2009-01-06, 04:55 PM   #1
Punyuni
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Anyone know the thread size for the crank bolt on a Koxx1 hub

I have a standard white russian, with a Koxx1 hub and cranks. I mangled the thread when removing the cranks last night, and need to get a tap to chase the threads. Also need some replacement crank bolts,

Thanks for any help.
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Old 2009-01-06, 05:57 PM   #2
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M12x1.0

Searching stuff like this tends to be pretty useful as this was just answered a couple of days ago.

As long as you have the reinforced hub, above are the thread specs for the crank bolts. The Koxx light hub will be M15x1.0.

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Old 2009-01-06, 07:14 PM   #3
OneWheelLess
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So you're saying they use larger crankbolts than kh/nimbus hubs??? Are you sure?
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Old 2009-01-06, 07:30 PM   #4
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What? Are you sure you're reading things right? Maybe I wrote that poorly.

Koxx (reinforced) ISIS, Nimbus ISIS, KH ISIS hubs all take M12x1.0 bolts. That is the standard size.

The Koxx "Light" hub takes bigger bolts M15x1.0. Since for the light hub there is a larger diameter hole drilled out (for more weight loss) it needs larger diameter bolts, hence the 15s.

Clear?
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Old 2009-01-06, 09:14 PM   #5
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ok, got it!
you wrote it fine, i just read it wrong on my blackberry
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Old 2009-01-06, 10:22 PM   #6
danger_uni
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Hey, by the way- check the thread carefully on the tap. M12 x 1.25 is very common, but M12 x 1.0 is not. I don't know why the 1.0 size was chosen; it would have made it a lot easier if the bike industry had gone with a more commonly available thread.

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Old 2009-01-06, 10:52 PM   #7
OneWheelLess
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Quote:
Originally Posted by danger_uni View Post
Hey, by the way- check the thread carefully on the tap. M12 x 1.25 is very common, but M12 x 1.0 is not. I don't know why the 1.0 size was chosen; it would have made it a lot easier if the bike industry had gone with a more commonly available thread.

Kris
do you know any good sources for a m12x1.0 tap?
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Old 2009-01-06, 11:04 PM   #8
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Old 2009-01-06, 11:09 PM   #9
danger_uni
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Originally Posted by OneWheelLess View Post
do you know any good sources for a m12x1.0 tap?
Good question; not sure what the answer is. I think they exist though; a machinist friend of mine has a M10x1.0 tap which I assume was part of a set at some point. If you find one definitely post about it. If you've only messed up the outer 1 or 2 threads, you may be able to fix it without needing a tap; might be worth taking it to a machine shop for that though.

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Old 2009-01-06, 11:32 PM   #10
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This one should work.
http://cgi.ebay.com/M12-X-1-0-HSG-D6...ayphotohosting
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Old 2009-01-06, 11:45 PM   #11
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Oh snap!, here is the M15-1.0 tap. The link has all sorts of bike tools.http://www.biketoolsetc.com/index.cg...m_id=MS-M15X1T

Last edited by sxbud138; 2009-01-06 at 11:46 PM. Reason: forgot link
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Old 2009-01-07, 06:09 PM   #12
Punyuni
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Thank you

I have the heavy duty hub, so the M12x1.0 is the tap required.

I managed to find one on Amazon, http://209.85.173.132/search?q=cache...lnk&cd=1&gl=us

$7.90 plus shipping.

Thanks for all your help !
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