Thread: making cranks lighter?
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Old 06-26-17 | 09:30 PM
  #20  
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maddog34
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Bikes: 1982 Trek 930R Custom, '91 Diamondback Ascent w/ XT, XTR updates, Fuji Team Pro CF road flyer, Specialized Sirrus Gravel Convert, '09 Comencal Meta 5.5 XC, '02 Marin MBX500, '84 Gitane Criterium bike

6061 vs, 7075... the 7075 will have improved wear characteristics, but will fatigue crack sooner...this makes 7075 better for chain rings, but worse for frames...the extra copper is added to the alloy to reduce cracking.

Compare 6061-T6 aluminum to 7075-T6 aluminum
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