I am looking at picking up a new Black 105 Crank. I do not understand the bottom brackets though. Can I order an Ultegra or Dura-Ace Bottom Bracket and it will work fine with the 105 crank or do I need to get the 105 BB? Are there some real advantages to buying one of the higher level BBs?
This is a probably a very elementary question, but I appreciate your help.
So, whats the difference between the sealed cartridge types and the hollow ones? I am pretty certain I need the hollow type, just curious what the difference is?
Also, I would need 68 which is English Threading, correct?
68mm is the width of the bottom bracket shell for a standard English BB, so, correct.
The bottom bracket type needs to match your crank. If it's the latest series 105 crank, you need the parts for the hollow spindle. A sealed cartridge BB is probably the older Octalink type, which is for a different crank.