first i've heard of it. interference fit parts rarely get to customers if they're out of spec, but I suppose it can happen. Did the person you bought it from have this issue?
what does, "inspecting the fork stem" mean? did you use a caliper to check the dimensions?
put a caliper to both the race and fork crown and see what's up.
could be your race is oversized.
if your fork has a straight steer tube the crown race seat diameter should be:
30.015(+0.06)mm
and the race ID should be:
29.98(-0.05)mm
if your fork is tapered the crown race seat diameter should be:
39.79(+0.06)mm
and the race ID should be 39.76(-0.05)mm
FYI: interference fit tolerance is usually expressed not as +/- but as target value with tolerance that increases interference link
Great information:
I measure the race base. This is the variation I got
29.9
29.7
Looks like its under spec. When I first installed a brand new king race it seemed to go on pretty easy, but had NO play.
I had several other king race rings and tried them but they all had play.
Just wondering if this is a niner quality issue getting out of the factory or????
I know manufacturers don't make quality issues known to the public.
Mine has been doing the same thing and when I pulled the stem off to investigate the compression had plug definitely moved upwards. The compression plug is not what holds everything tight though, it is only used to set the pre-load on the bearings, so it moving is more a symptom than the cause. I think the real issue is the stem has a hard time getting enough bite on the carbon steerer and starts slipping upwards pulling the compression plug up along with it. Niner supplies carbon paste to help provide some extra grip between the stem and the steerer so I would try that if it hasn't been used.
The stem slipping was mentioned as a possible culprit. I put more friction past on it. I put friction paste on the compression plug and locktited all the bolts, although I think Niner recommends against doing so. I may even locktite the compression plug, and of course I will be responsible for any consequences. Origin 8 has a new funky looking fork out with a hefty weight limit and a straight steerer tube. I could of sworn that Whiskey had a straight tube fork at one time. I may go with an On-One fork and be done with it. I do have a older WaltWorks fork which has a nice feel, but is sort of a tank.
The stem slipping was mentioned as a possible culprit. I put more friction past on it. I put friction paste on the compression plug and locktited all the bolts, although I think Niner recommends against doing so. I may even locktite the compression plug, and of course I will be responsible for any consequences.
Honestly, I don't think friction paste nor locktite would be of any value on the compression plug given its role is to set initial pre-load *before* you tighten the stem bolts. After the stem is tightened the compression plug is basically just along for the ride and perhaps re-enforcing the steerer tube against any crushing force from the stem. I think the loosening is mostly due to a rigid fork passing a lot more impact force into the stem/steerer tube interface than a suspension fork would. It is certainly annoying to have it coming loose as I tend not to realize it has done so until the end of the ride which means the headset pieces were being allowed to move around for god knows how long during the ride. This can't be good for the headset and could quite possibly lead to some of the wear on the crown race seat area that others are reporting.
The crown race from a Cane Creek FORTY headset is too loose around the straight steerer tube. The steerer tube measures 29.46mm and it should measure 30.0mm.
This is a new Niner fork which was not previously used or installed.
This happened to my Niner fork too. I called Niner about it and they sent me a replacement. Good luck. I tried two different headsets before realizing the fork was the problem.
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