Lately I've been commuting with tri shorts under my mountain baggies rather than full on bike shorts (or the liners they came with) or bibs. I like the thinner chamois as it seems to dry faster.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"