Very nice conversion. I just did about the same thing with a Centurion Accordo, mudguards and all.
By the way, to those not conversant on Trek's of this vintage, the model number is something of a code to the frame geometry. The first digit is the model level (higher is better), the remaining two have a lot to do with frame geometry and purpose of design.
x20's are touring bikes (the Trek 520 is an absolute classic of this genre). x60's are racing, the 460 was the amateur level (I've got one - geared - and absolutely adore it), 560's 660's, 760's keep getting better in tubing as you go up the ladder, all frames are made with a fast handling geometry. The 460's have the added advantage of not having come with shift lever braze-ons, keeping the clean lines without unnecessary hacking.
"Every time someone hacks a vintage frame to make a fixie, God kills a kitten."
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Syke
“No one in this world, so far as I know — and I have searched the records for years, and employed agents to help me — has ever lost money by underestimating the intelligence of the great masses of the plain people. Nor has anyone ever lost public office thereby.”
H.L. Mencken, (1926)