What bottom bracket do I have
The crankset is a BB30 FSA Gossamer with a 30mm spindle. There are four bottom brackets that will fit this crankset which might be in your bike. Thes are BB30(68/42), BB30a(73/42), PF30(68/46) and PF30a(73/46). To determine which one you need, there are two things to measure. First measure the inner shell diameter. 42mm is BB30/BB30a, while 46mm is PF30/PF30a. Measure the shell width to determine if yours is 68 mm or 73mm. If it's 68mm, then you need either the BB30 or PF30 (as determined by previous measurement). If it's 73, then you need either the BB30a or PF30a (as determined by previous measurement).