John-L said:
HI,
I have got a 2002 USPS Trek 5900 Superlight with shot headset bearings.
Basically the bike is in for a service, my LBS has found the problem with the headset bearings but they cant get the new bearing and it is taking an eternity!
Can anyone suggest where to get them or what they are part number etc so I can try and source some myself as racing season is here and I cant wait weeks for my bike to be repaired.
It is standard set up with Oversized superlight Aero OD fork and the headset has the Superlight Bearing System.
I live in the UK so this side of the water would be helpful but I'm getting desperate so am willing to ship them in.
Also does anyone know what other trek bikes have the same bearings in the head as my 5900 superlight??
Please someone help me!!
Thanks
John.
Did you notice your headset "binding"/grinding BEFORE you brought it in for service?
Unfortunately, the problem you have is/was epidemic with the
Trek 5900!
Your bearings, themselves, may not be shot ... check this thread:
All you need to do is remove the fork, remove the lower bearing from the fork, reinstall the bearing and then reinstall the fork (with bearing attached). In 90% of the cases, that takes care of it. It doesn't seem to be a misaligned cup, but rather an issue with how the lower bearing seats in it.
Also:
I have a 2003 5900 with a binding headset. Long story short, Trek recommends the lower bearing be loctited (Loctite 680) into the lower cup. Mine didn't come from the factory like that. I followed their advice and viola! I would recommend this to all of you with this problem (which is probably just about everybody with a 2000-2003 5900. If that doesn't work, Trek will (under warranty) face your fork crown, mount a new bearing and tell your shop to remount the fork using Loctite 680. If that doesn't solve your problem, Trek (under warranty) will remove the lower cup, add a sleeve and mount a 1-1/8 lower cup and give you a new fork (1-1/8 top and bottom).
AND:
Re: Replacement headset for Trek 5900
>I had a 2001 Trek 5900. Had to replace the lower headset bearing at about 4000 miles.
Mine made it about 12,000, but was in sad shape by that point.
> The real problem was that this design (the 1 1/4 inch lower bearing) locked me not just into the
> nonstandard headset but also the Trek 110 fork--which I think was the cause of much bigger grief.
It's actually 1 5/16", I believe.
>From day one I had handling problems. The bike was EXTREMELY squirrly at speed on anything but a
>perfect surface. It also felt strange in a sprint--like it was winding up and springing back.
Might want to check the fit of the *upper* bearing in the cup. Mine had .007 *clearance*!!!
I cut a piece of .003 stainless shimstock and did a full circumference wrap of the upper bearing and
slid it into the cup.
Voila! -- a whole new bike!
-- disclaimer -- I'm 140 lbs, so I know I'm a bit easier on the parts that quite a few people out there.
FWIW. Some have suggested (elsewhere) that the bearings are
CANE CREEK ...
CANE CREEK uses two types of bearings (that I've seen) in their headsets ... the cartridge type that
Chris King uses in their headsets which I think are in the S-type headsets (a "bearing" shop which caters to autombiles can order these), AND the quasi-cartridge bearings in the C-type whereby the bearings are held by a set of toroidal half-shells (these can be opened & cleaned and/or the ball bearings replaced, if necessary).
The 1"
Campagnolo "hidden" headset used the equivalent of the Cane Creek C-type bearings; so,
there is an outside chance that the bearings for a 1 1/8" Campagnolo "hidden" headset (I think they made one) will fit your TREK ... it might be worth investigating.