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Old 04-16-19, 11:27 PM
  #11  
reburns
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Join Date: Apr 2012
Location: Saratoga, CA
Posts: 270

Bikes: 2005 Trek T2000; 2005 Co-motion Speedster Co-pilot; various non-tandem road and mountain bikes

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Spinergy wheels use a proprietary polymer composite spoke material:
https://www.spinergy.com/content/pbo-spoke-technology

The company specifies tension in values generated using a Park TM-1 gage, which I have. https://www.spinergy.com/content/bicycle/maintenance

The TM-1 conversion table includes 2.6 mm round Spinergy spokes like mine. I used the table to come up with the 120 kgf number. The actual recommendation from Spinergy is for a TM-1 reading of 22-24 for the drive side. Of course my NDS number should be the same since my wheel is not dished and is laced symmetrically. I left it at the low side of this, 21 on the TM-1, because I have heard that spoke hole cracks can come from too much tension, and also because I believe the wheels were tensioned lower as they came from the factory, maybe because the wheel isnít dished. For instance, the recommendation for the radial front spokes is 20-23. But you might be right that the root cause could be low tension rather than high. High tension certainly didnít cause cracks around the hole for the presta valve, for example.
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