Upgrading a "cheap" bike
My question is about upgrading a road bike. I intend to buy a fairly old road bike (gt force with that different frame shape around seat tube). Here's the deal, it is quite cheap and it comes with shimano 105 groupset (which I believe is good bargain for the price). Is that simple to upgrade the frame? You go buy a frame transfer all other components and that's it?
I hope I didn't make a mess out of it.
Thank you for any help.