I was just given an old Performance R203 frame, with the donor in hopes that I would resurrect it into a nice road bike. I promised him that it will be returned to its original functionality, even though I may have to replace some old components with new. It is good to know that a Shimano 105 group can be used in place of the worn RX100 parts that are currently on it. If I can unseize the derailleurs and linear-pull brakes, I'll be half way there. I have yet to deal with the crank that has the left-side arm missing. The seat post is stuck in place, so I'm allowing it to sit with some penetrating oil, in hopes that it will come out eventually. I will not have a choice but to locate a new wheel set, but I think it should be worth it in that it has True Temper AVR double-butted tubing. That is a rarity in our local market for bikes, so I may have got lucky. But who knows?