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Dura Ace bb install question(5 posts)

Dura Ace bb install questioneflayer2
Mar 20, 2003 1:42 PM
I just took ownership of a bike with a new dura ace double build kit installed. My question is about the the DA bottom bracket. I'm pretty sure this is the serviceable model and the cup threads appear to stick out about 4 threads beyond the outside edge of the lock ring on one side. My two other bikes have ultegra triple bb's and both cups lock down flush with the sides of the shell. Why would the cup threads be sticking out beyound the lock ring? Does is sound like this is installed correctly?
yep, but throw it away anyway...merckx56
Mar 20, 2003 1:55 PM
D/A bbs suck! Throw in an Ultegra or a D/A track bb. The track bb is the way to go because it is sealed and has a steel non-drive cup! Not much heavier, not much more $ but fully bulletproof.
yep, but throw it away anyway...bill61
Mar 23, 2003 9:00 AM
Are ultegra BB as stiff as Dura-Ace BB ?
re: Dura Ace bb install questionCalvin
Mar 20, 2003 1:56 PM
There is no way that Shimano could have the thread of the lockring be exactly flush with every bike. Bottom bracket widths vary by several mm. A "68mm" shell standard may measure 66mm or 69mm depending upon the tolerances of the manufacturer. It is only critical that the lockring have full thread engagement.

See also http://www.parktool.com/repair_help/FAQadjbb.shtml
don't throw it out!!weiwentg
Mar 20, 2003 2:26 PM
I was advised that the moveable cup (left one) should be tightened just past the point where there is no play in the spindle. it does need to be regreased regularly. but if installed right it will be fine, mine has lasted several thousand miles and shows no sign of dying. posters who tell you to throw it probably had theirs installed wrongly or didn't do maintenance.