Originally Posted by
homelessjoe
bottom brackets come in different lengths.........103mm ...106mm .....on and on.........your crank requires a specific BB length.......your chain line will be off and it might not shift if you dont use the right length..............not all years of 105s take the same BB length......look up your new crank and see what size of BB is required......only one size will work.....you will need to measure [mic] your old one to se what size it is ........my opinion........A BB upgrade is more important than a crank upgrade.........
Wrong or right, I appreciate your your intent to help, brother. Thanks for that.
Originally Posted by
cpach
If you're swapping Shimano cranksets you do not need to change anything about your bottom bracket for reasons of compatibility...
Gotcha! Thanks a ton for the detailed and very helpful reply. I appreciate it.
Originally Posted by
davidad
They are the same. I wouldn't change it on the principle of if it ain't broke don't fix it.
Thanks!