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problem with dura ace headset(3 posts)

problem with dura ace headsetfmuson1
Aug 9, 2002 10:28 AM
has anyone experienced this problem?
My headset (dura ace-stock, came with the bike, trek 5500) becomes loose after a few rides. I retighten the headset but I can not tighten the locknut enough to make the headset stay inplace. The locknut won't go any further and as a result the headset eventually becomes loose again.
Its about 10 years old. I haven't taken it apart yet but I know it was serviced recently and the bearings were fine. Is it possible to crush the cups by hitting a pothole?
re: problem with dura ace headsetTJeanloz
Aug 9, 2002 10:54 AM
I don't know how you could have arrived at this situation, unless the bike has always done this, but it sounds like a spacer between the locknuts is in order. The top lock nut may be bottoming out on the top of the fork before it cinches on the bottom locknut.
re: problem with dura ace headsetfmuson1
Aug 9, 2002 11:14 AM
It seems that a spacer would allow the top lock nut to "do it's job" over the bottom one. It is odd that one day extra space showed up.