I am starting a project to modernize an older steel frame. It has 130 mm dropouts and will take modern wheels, was set up with an Exage 7 speed group. I was original just going to put on some tourney 7 speed brifters with the original drive train.

However, I have just been gifted a nearly full groupset of Shimano 105 5700, shifters, front and rear derailleur, Brakes, cassette, chain, and FSA crankset. The crankset came off a bike with a BB30 bottom bracket, and the bottom bracket is the one thing the set is NOT coming with.

The bike to be worked on, as I mentioned, has an Exage group, 300ex to be exact, including the bottom bracket with I believe a square taper. I have a wheelset that will accept the 10 speed cassette.

I figure the shifters, cabling, brakes, and derailleurs shouldn't be too much of an issue, just replace the DT shifters with some cable stops and put everything else on and tune it up.

BUT... the crankset... that I am concerned about. I haven't done it yet, but I imagine that a BB30 compatable FSA crank will in no way fit with a square taper Exage bottom bracket, but it of course would work with the 10 speed group.

My question is what do I do about the crank?

I see a few possibilities, but I don't know which one is possible, realistic, or worth pursuing.

1. - Use the biopace double crank already attached to the exage BB. (Will this work with 10 speed group?)

2. - Find some way to attach the FSA 10 speed compatable bb30 crankset to square taper exage BB. (Is there a realistic, inexpensive way to do this?)

3. - Buy a modern, new or used crankset that is compatable with exage BB AND with 10 speed group? (is there such a thing?)

4. - Buy a new BB that is compatable with the FSA crank and will fit the frame? (Again, is there such a thing?)

5. - Worst case, buy a new BB and a new Crankset? (What BB fits the standard BSA threading and works with 10 speed without breaking the bank?)

6. - Worst worst case, I'm crazy for trying to put a 10 speed group on a 1990 steel bike, I should just sell the group and go back to my original plan for 7 speed brifters on the exage drivetrain? (or maybe throw the group on a 2004 Raleigh I use as a rain bike that has 8 speed Sora instead?)

Any of you more experienced, wiser wrenches have any insight here as to which is the least stupid and most cost effective route to take here?