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Old 05-15-15, 11:28 AM
  #7  
FBinNY 
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Join Date: Apr 2009
Location: New Rochelle, NY
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Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

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When mud tires have cup shaped center blocks like these, the (larger) cup points back on the ground for better pushing. Think the opposite of aero profile. On front tires it's the reverse, the cup points forward so they bite when braking.
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