Ive been unable to install a cartridge BB i was advised by the BB retailer to measure the shell myself. To my amazement its clearly 67mm instead of the expected 68!

I noticed that the higher end 2006 Trances came stock with external BBs so i wondered whether Giant routinely faced all the front triangles (regardless of whether they were destined for black paint jobs & powersplines)
Could this account for my missing mm.