I have a Specialized Tarmac Comp bike from 2010. It has a Shimano 105 SM-FC5600 Bottom Bracket that I want to replace. It makes clicking sounds, after 50.000km of use. I think I can use any shimano bracket set for Hollow tech II, I currently have a Shimano Ultegra crank set on the bike with the 105 bracket.
The problem is that a bracket comes with either BSA thread or Italian thread. I can't find online what thread my bike has. I emailed Specialized, I expect a reply i a few days. I wonder, is there a way to find out what thread the frame of my bike has?
Edit: On the bracket is stamped "1.37x24" I found that this means it has BSA thread. Problem solved, unless someone has additional tips :-)
Edit 2: the diameter of the 105 bracket bearing is 44mm, a new one has 39mm, so I need two different bracket grips.