Would you please compare the values of these two frames:
Cannondale - 1985 model SR300 in 53 cm, metallic green. Decals and paint in good condition, only a few small scrapes, cable housing clips intact. Various other decals added: "Shimano", "Scott", "Mavic." Dropouts and seat tube top painted black.
Trek - 1981 model 710 in 47 cm, metallic dark blue. Reynolds 531 double butted, Reynolds decals partially worn off, no other decals, a fair number of paint scrapes and chips, no dents or rust, Trek head badge in nice shape.
Would it be fair to do a straight swap of these frames?
Story: my friend bought the Cannondale as a complete bike, with Campagnolo brakeset and derailleurs and BB and aero seatpost, Suntour Superbe Pro crank and shifters, Cinelli stem and bar, Mavic 500 hubs, gray anodized Mavic rims, all components in very nice condition. Unfortunately, the 53 cm Cannondale frame was too big for her - she's like 5'1" or close. I have the Trek frame, and offered to swap her bike's components over to the 47 cm Trek. Which I have just finished doing, pretty straightforward, took the opportunity to true the wheels and clean and lube moving bits.
So, the question is what does she owe me? I was going to simply have her pay me for the Trek frame, $200, which is what I bought it for a few years ago. But I wonder
(1) is that too much to have her pay for the Trek frame, maybe it isn't worth that much?
(2) should I offer to simply trade the Trek frame for the Cannondale frame, or will that be unfair to one of us?
As may be obvious I'm not doing this for profit, just as a favor including free labor, just don't want to over charge her.