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Old November 20th, 2014, 01:26 PM   #9
Foot2big
The Elder Skatesman
 
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Join Date: Aug 2007
Location: Oklahoma City
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The two extra bolts are for stability. They help hold the frame together (2 piece)

Definitely felt a huge speed increase. I went from 57mm to these 72mm. Huge top end gain without a lot of sacrifice on low end.

A lot smoother roll/ride too.
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