Installing Sugino 75 Bottom Bracket

wheels Sounds like you have a 68mm BB shell and not a 73mm BB shell . . . or the shell has been 'faced' once or twice by an over zealous mechanic.

. . . nothing to worry about if it is only two or three threads, once you have plenty of threads in the shell + it all turns nicely + there is no play then it shouldn't be a problem.

Here is a great thread over on BikeForums about Sug75BB installation - you probably don't need it now, but the bloke who did it did lots of nice photos so it is a great guide ! :)

Clickety click http://www.bikeforums.net/showthread.php?t=208402

Cheers Wheels. It is defiantly a 68mm shell, I just measured it, also the frame is brand new so no facing.
Can you get 73mm sugino bb, because when I measure from the two faces of the bb it comes to 73mm!
I am still bit confused, but if you think it is o.k then that is fine.