Join Date: Nov 2005
Location: NW Ohio
Bikes: 1984 Miyata 310, 1989 Club Fuji, 1986 Schwinn Sierra, 2011 Jamis Quest, 1980 Peugeot TH8 Tandem, 1992 Performance Parabola, 1986 Ross Mt. Hood
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The Schwinn rims are a few mm larger than the 590 rims (597mm vs. 590mm) but you may be able to just swap the rims without unlacing the spokes. You fasten the new rim next to the old one and transfer one spoke at a time. Loosen all the spokes first. For initial truing, just make each nipple have the same number of turns, then keep snugging them down one turn at a time. Since the new rim is smaller, make sure the spokes don't poke out through the nipples, file the tips off if they do.
For the 27" rims, I have new alloy rims on order, but I think 294mm spokes will work for 3x lacing. I laced up some old steel rims with old spokes to test the concept, but the spokes were too short so I could only lace them 1x.