Either I'm real lucky, or my bike isn't resonating any noise. (Trance X Advanced.) Sadly, I never want to remove the fork ever...I spoke at great length with one of the head engeneer/owners at CC and I got some good info for you all.
One critical setup trick that is not explained anywhere is how to get the gimbals straight on top of the bearing. When assembling the headset, before its tight you have to eyeball the gimbals front to back and side to side. Take a small flathead screwdriver and align the gimbals so that they are right on top of the bearings. It's tricky to do and I have found using a Sharp chisel fits in there better.you have to look at the seal on the upper cap and see if there is light on one side and not on the other,and move it until it looks straight. then tighten the headset down.
Unfortunately this has done little to make the headset any quiter!
I have found that running the gimbals dry makes them click but not clunk which is slightly better.
My giant has a 44mm upper cup and it doesn't taper lock which makes things worse. luckily its a single crown fork so it doesn't clunk as much. they are making new 44mm cups that will taperlock. ill probably just go with a Works headset. My 6" bike with a 66deg ha is rad(as long as you're going fast LOL), this whole build was.around this headset
I was talking more so about running an offset top cup and offset bottom cup.I need to check my bearing for the galling issue.
Regarding running the offset cup on the bottom, Im thinking there is an additional adjustability introduced. When using the offset cup on top, it moves the bars/cockpit back, shrinking valuable cockpit space for some. If the offset cup is used on the bottom, the shift would effect the cockpit less, and have the reverse effect on wheelbase (Eg instead of tightening the cockpit by .25-.5" it would lengthen the wb to some similar degree.
Comments? Too little oxygen??
Load of doody.yup, I couldnt get it to work for the life of me. Mr. Skatodd installed it one shot with a TON of thick grease and it worked. Might I mention he installed it 2 times and it worked great, no problems. I myself could not do it.
so yes it was USER ERROR!
I'm about to give this a try. I decided to move the cups around to give me a longer reach on my V10c and I was able to insert the lower cup by hand. Hmm. I am laughing even though I'm a little bit frightened. here we go...Hey Kris
I am curious if you or anyone has tried to step-wise tighten the headset while simultaneously 'releasing' or re-centering the various interfaces in the headset (sort of similar to your system of moving the Gimbals/bearings with a tool).
Something like this:
-anti-seize the crap out all interfaces
-assemble all parts in what appears to be proper articulation
-now tighten the cap to where there is still 'just a little movement' in the system
at this point you start a iterative process of:
- gently rocking the fork/crowns back an forth and side to side
- at the same time turning the fork in something like 60* increments for the full 360* (pay attention to trying to find 'center' such that all parts are aligned and free-moving rather than wedged and 'stuck')
-Tightening the cap ~1/4 turn
- Repeat until FULLY tight.
It sounds like things are getting stuck/bound and then tightened in a situation where they are not 100% aligned. Then when loaded, they break free causing the noise (most likely sticking in another non-aligned position) and the cycle repeats.
Complete alignment (if possible) and then proper tightening would prevent this from happening.
It also seems like top cap clearance has been an issue for several people. Micro spacers have been a NEED for just about every 'IS bearing' style headset that I have used (road bike, adapter cups, press fit, drop in fit, etc).
let us know after a day of riding. I might like to try a 0.5/1.5 setup.we'll see how I did when I sober up.
I decided to move the cups around to give me a longer reach on my V10c and I was able to insert the lower cup by hand.
Yeah I have only had that happen a few times in all my years as a mechanic and it was usually on aluminum frames with ovalized headtubes, not a brand new $3000 carbon frame...
Not cool dude! You definitely have something screwed up.
Turns out this IS the case! The cup is the culprit and I am sorry I ever doubted you Santa Cruz. Your product is magnificent and amazing and I can not thank you enough for making such a well engineered, strong, beautiful, elegant and perfectly suspended velocipede. Not to mention the XL Geo is perfect for me @ 6'5". Now I just have to send the cup back to CC. And thanks to SC spec'ing a 1.5" HT because now I have a spare 0* cup to insert and may continue RIDING!!!!!!!!!!!MmmBones, I think it could also be possible that the specs on your cups aren't right. I recently tried putting some evil reducer cups on a brand new Bullit and I was able to put the bottom cup on by hand while the top cup was appropriately snug. When I tryed switching the cups, the bottom cup easily slipped on the top of the headset and the top cup was snug on the bottom of the headset. I took this to indicate it was a problem with the cups and not the frame. Worth a try. It definitely seems like a bit idea to run it with a loose cup, regardless.
And note that this is across 5+ bikes, not one, and factory/team mechanics who I'm comfortable assuming wouldn't have their jobs if they werent very very good at it.talked to a mechanic for one of the teams at the last Pro GRT and he said their Angleset is hit or miss when it comes to loud knocking noises.
Make a triangle from stem to ground to a point on the ground parallel with the fork.So it turns out that my second installation went just fine even though I was drunk.
I popped a -1.0 up top and -1.5 on the bottom and holy crap...
I rode it pretty hard today and hit all of FMX, and the ski jumps, barn door drop, Extended Play, 3 blind mice, and some other big jumps to ensure it wasn't going to pop and it didn't.
There is definitely a difference between running a 0* and a -1.5 and running a -1.0 and a -1.5. My wheel base grew a half inch between the two. I need to grab an anglefinder and see where I'm at. Whatever it is, it felt really good. Even on jumps where slack is usually awkward.
Mine?pix
I ask for a swisha
That's a great looking bike. Large?Mine?
It doesn't look that slack just looking at it.. until you use the vertical fence lines as a reference.
I thought it was just me. I installed an Acros Ai-25 headset in my V10c last night and the top cup went in with medium hand pressure. The bottom cup went in normally. I'll try the cup swap to see what happens. Wonder if the frames aren't being reamed properly, since we're talking about 2 different headsets.Yeah I have only had that happen a few times in all my years as a mechanic and it was usually on aluminum frames with ovalized headtubes, not a brand new $3000 carbon frame...
Edit: Sending frame back to Manufacturer to have it checked along with the HS.
Call 800-234-2725.Don't have an angleset, but have been observing this thread and have a couple questions for the angleset owners.
1. What material is the gimbal and the insert/race which the gimbal sits in?
2. What type of surface finishing is used on these parts?
3. To your best estimate what is the surface RMS of the two contact points. For reference I'd estimate a fork stanchion to be in the neighborhood of ~10.
Make sure you are using Fiber Grip not grease to install the cup. It turns out it was the cup that I was using that was out of spec. Not the frame.I thought it was just me. I installed an Acros Ai-25 headset in my V10c last night and the top cup went in with medium hand pressure. The bottom cup went in normally. I'll try the cup swap to see what happens. Wonder if the frames aren't being reamed properly, since we're talking about 2 different headsets.
Don't have an angleset, but have been observing this thread and have a couple questions for the angleset owners.
1. What material is the gimbal and the insert/race which the gimbal sits in?
2. What type of surface finishing is used on these parts?
3. To your best estimate what is the surface RMS of the two contact points. For reference I'd estimate a fork stanchion to be in the neighborhood of ~10.
Thanks for the tip MmmBones. I did use grease for the AI-25, but Fiber Grip would not have made a difference with my top cup. I just pulled it out by hand, and the bottom cup with a slight tap. This headset is going back and I've ordered a regular (non Angleset) CaneCreek 40ZS49 reducer.Make sure you are using Fiber Grip not grease to install the cup. It turns out it was the cup that I was using that was out of spec. Not the frame.