On two separate occasions I have lent bikes (Peugeot PKN-10 and Bianchi Campione d'Italia) to visiting BFers for a week at a time. Both experiences, including a couple of rides together, were satisfying.
I also lent out a lower-end SR "10-speed" a neighbor had given me, and it was stolen while in the borrower's possession. I told her not to worry about it, since I did not have that much invested in it, anyway.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069