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Old 02-13-16, 01:19 AM
  #7  
FBinNY 
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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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Originally Posted by Plimogz
If you clean the rims to examine the shape of the bottom of the grooves, that would give you some hints as to whether they were machined there by design. .....
I think that 4 identical grooves (both sides of 2 rims) is enough to infer that they are there by design, without needing to know anything else.
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