I'm really torn on the subject since I ride a fixed gear and have my 930, which I never will consider converting. If an older bike getting converted to a fixed gear means it is one less bike going to the dump and will be ridden. That said, I've seen some conversions done with absolutely no taste and it does bother me. While I've seen some beautiful conversions as well.
I plan on doing a conversion in the future and am planning on doing it right, leaving the bosses on it and using box style rims and with just the right amount of chrome.
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Appreciate the old bikes more than the new.