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Old 03-11-18, 12:21 PM
  #12  
FBinNY 
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Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 36,049

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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It's not about new or used, but about how well ill or well conceived the bike is. For example, the OP mentions converting a 700c (or 27") to 650b. But the reduction in rim diameter will impose a brake reach issue. Even if the OP finds caliper with adequate reach, the change in geometry will mean far less leverage, coupled with a reduction in arm stiffness.

My rule has always been that not only is it impossible to make a silk purse out of a sows ear, you can't do so even if you start with a canvas purse.

So, my advice is to start by deciding on the basics, such as wheel size, and ONLY consider options that meet that most critical parameter. A used bike with upgrades and modifications can be a great option,but not one totally remade into something it can never be.
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