My weekend acquisition, snagged ridiculously cheap - but only after I had measured and re-measured the chainstay clearances and done my research. A 650b conversion done as cheaply as possible is in this bike's future ...
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I wish I could say definitively that it is a 1990 or a 1991, but so far Diamond Back catalogs for those years have eluded me. The SunRace rear derailleur will be replaced along with the wheels and calipers.