Joined: Jun 2011
Posts: 1,180
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From: Sunnyvale, California
Bikes: Bridgestone RB-1, 600, T700, MB-6 w/ Dirt Drops, MB-Zip, Bianchi Limited, Nashbar Hounder
lbf might mean lbs-Force. Underwater, bouyancy may change the effects of gravity. lbf denotes force equivalent applied perpendicular to the moment arm regardless of gravitational or other considerations.