PoerTap G3 with 21 hole rim (fulcrum speed)

Discuss light weight issues concerning road bikes & parts.
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kavitator
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by kavitator

Has anyone build POWERTAP hub G3 with Fulcrum speed rim (50mm carbon tubular)?

For this need 28 holes powertap hub. Plan is to build on NDS 3x (14 spokes Sapim cx ray) ; DS radial (7 spokes Cx ray or Sapim Race) with heads IN.

Max spoke tension on DS will be 140kg

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thisisatest
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by thisisatest

i dont know anyone who would build one that way. i can think of a million reasons not to, but that wasnt your question, so...

by Weenie


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kavitator
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by kavitator

ZIPP have same lacing (Radial on DS, 2x NDS).

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WMW
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by WMW

kavitator wrote:For this need 28 holes powertap hub. Plan is to build on NDS 3x (14 spokes Sapim cx ray) ; DS radial (7 spokes Cx ray or Sapim Race) with heads IN.


Absolutely not. Even with 140kg on the DS, your NDS spokes will have ~30kg of tension which isn't nearly enough. If you feel you must do this, lace the DS with 14 spokes, and the NDS with 7. But I wouldn't recommend that either, just because Saris won't approve it. I've done it though and it works fine.
formerly rruff...

Mackers
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by Mackers

Proof that life is stranger than fiction :)

thisisatest
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by thisisatest

kavitator wrote:ZIPP have same lacing (Radial on DS, 2x NDS).

They have the same lacing, but only with an equal number of spokes left and right. As said above, there is zero possibility of having enough left side tension in your proposed 1:2 pattern. Fulcrum, Campy use 2:1 to even tensions out, your choice is going the wrong way.

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kavitator
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by kavitator

mission aborted :-)
thanks .
guy who want a rear wheel powertap has one carbon rim fulcrum speed.
new rim for him. 50mm with 28 holes or 60mm 24 spokes i sugessted to him

by Weenie


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