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I am looking at building a powertap wheel. Does anyone know how much difference there is between the 12mm (2009) and the 15mm 2010 hubs?

There is about $100 difference in price. Does the $100 for the 15mm increase stiffness, or bearing life.......

Thanks
 

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Honestly, I think the 12mm axle is better because you get bigger (and stronger) bearings. The bore on the hubshell for the bearings is the same, so in order to use a larger axle, smaller bearings are needed. I don't know how the larger axle influences stiffness.
 
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