My road bike has the older shimano 9 speed set up. Up front I have a ultegra bottom bracket/crank/derailler. I bought these componenets about 6 years ago. In the back i have a dura ace derailler and a newer 9 speed dura ace cassette.
I think it is time for a new bottom bracket. I am wondering if I could upgrade to the newer hollowtech style bottom bracket with a matching crank but retain my other parts. Is this possible?