|Deda Newton w/1" Chris King?||MJM|
Mar 24, 2001 8:56 PM
|I just purchase a new Deda Newton stem along with a new Chris King 1" threadless headset to assemble a new fork on my road bike (1" steerer). This is my first assembly of a threadless system so bear with me.
My problem/question is this, the diameter of the stem top cap seems too small. The cap does not extend over the opening in the Deda stem (it covers exactly, the shim for the 1" steerer only), so if I were to tighten down the screw, it cannot "push the stem down" to load the bearings, it just "pushes the internal shim" and the stem can just slide right up and off.
What the heck is going on here? Are the two (deda newton and Chris king) not compatible? Do I need a larger diameter stem top cap like one from a 1 1/8" version? or do I have to do something lame like put a spacer on the top of the stem? (NOT WHAT I WANT TO DO).
Any help would be grateful.
|should still work....||dave|
Mar 25, 2001 5:12 AM
|Using the 1-1/8" adapter bushing to preload the bearings should be OK. The bearing load does not have to be applied through the stem (it's a light load). Just tighten the steering tube clamp bolts on the stem after the preload is applied. Recheck the bearing clearance after riding a few miles. Sometimes the lower race settles in a little and creates some unwanted slop.
One of the Campy Record carbon fiber top caps that I have works the same way.
|should still work....||MJM|
Mar 25, 2001 5:55 AM
Thanks for your reply. So once the preload is set using the adapter, simply apply pressure from the top of the stem and tighten the clamp bolts?
You've had no problems with your Campy setup?
Mar 25, 2001 9:25 AM
|The "preload" on most headsets is just a light clamping pressure, applied by lightly tightening the top cap bolt. The slight pressure is intended to insure zero clearance between the bearings and races in the headset. Whether the pressure is transmitted through the stem or the 1-1/8" bushing won't matter. After tightening the steering tube clamp bolts are tightened, tighten the top cap bolt a little more, so it doesn't loosen up from road vibration.|
Mar 25, 2001 10:19 AM
Your last statement is exactly what I'm concerned about.
"...After tightening the steering tube clamp bolts are tightened, tighten the top cap bolt a little more, so it doesn't loosen up from road vibration."
Isn't the idea of an aheadset system to be a "set it and forget it"? I thought tightening the stem clamp bolts should "lock in" the preload of the bearings, hence requiring no or little further adjustment from "road vibration" or whatever.
Might another option be, bonding the 1" shim to the stem itself with something like JB weld? This way, when you tighten the stem top cap you'd be pushing down on the entire stem (shim included) and when tightening the stem clamp bolts, locking in the preload?
thanks again for your input...
|I have a King and Newton combo.||Ian|
Mar 25, 2001 12:16 PM
|I used a 1 1/8 top cap, it is the easiest solution. I believe King sells top caps separately if you want to keep it the same.|
|I have a King and Newton combo.||DrD|
Mar 25, 2001 12:29 PM
|Also - if you call up CK and talk to them, explaining the problem, they might even hook you up with the right size top cap for free. Their customer support is top notch (always very responsive, and willing to go the extra step to help you out - as an example, they sent me an undersized crown race to correct a problem I was having! Great company)|
|Re:I have a King and Newton combo.||MJM|
Mar 25, 2001 1:10 PM
|DrD, thanks, I've heard that about them as well. I'll give them a call tomorrow...|
|Re:I have a King and Newton combo.||MJM|
Mar 25, 2001 1:07 PM
Thanks for your input. In further looking at my set up today. I came to the same conclusion, the use of a 1 1/8" top cap would be best. I also noticed that the shim for a 1" steerer that came with the deda is about 2mm shorter than the clamp height. (ie. when the shim is in the stem, the top and bottom of the shim are not flush with stem). I assume this allows the "relief" ridge on the 1 1/8" top cap to sit nicely in the top opening of the stem.
When you cut your steerer, did you simply put everything together (bearings, spacers and stem), make a mark flush with the top of the stem, and make your cut 3mm below that?
|Re:I have a King and Newton combo.||Ian|
Mar 25, 2001 3:00 PM
|Yes. I put on the spacers, 25 mm worth and then the stem, which is 37 mm. Marked it and then made the cut just below.|| |