New Chumba F5

[Mudman]

Originally Posted by Jordansrealm

Looks like a great new steed to add to your lineup!

yes indeed. My goal is to have 7 bikes. So I can ride a different one every day.

Originally Posted by 2wheel_lee

Do you know something no one else does? Please share!


I suspect that the photos of the green F5 don't do the color justice. That must look sweet out in the sun.

Nope the photos don't do much for the color. But I have an idea

Originally Posted by BFloFoxRider.

the candy orange is pretty sweet too... so alank whats the price of one of these built up?? spill the beans!

how much is your arm and leg worth?

I'd still love the F5 in ano black and gloss black graphics!

[Rob]

Originally Posted by alank

Hey Rob,

What's your reasoning for that? As far as I know, Ted has been running King headsets on all of his DH bikes for over ten years.

They don't have the separate compression ring that sets the bearing preload. It's built into the top skirt of the headset. The problem with that is that it can rock back and forth when a lot of force is put on the bars.

I have one installed in my Titus right now that I would let you ride if you like. Everything is perfectly installed, headtube reamed and faced, inner edges rounded and clean, everything lubed correctly, torqued to specs, etc.

You'll feel it when you are going down tight switchbacks under braking, and when descending technical sections.

I'm not the only one who feels this way either, check out other MTB forums and ask around. The Service Manager at the shop I work at has experienced the same problem with CK headsets on higher travel bikes.

I'm going to try out the Cane Creek 110.

[alank]

Originally Posted by Rob

They don't have the separate compression ring that sets the bearing preload. It's built into the top skirt of the headset. The problem with that is that it can rock back and forth when a lot of force is put on the bars.

I have one installed in my Titus right now that I would let you ride if you like. Everything is perfectly installed, headtube reamed and faced, inner edges rounded and clean, everything lubed correctly, torqued to specs, etc.

You'll feel it when you are going down tight switchbacks under braking, and when descending technical sections.

I'm not the only one who feels this way either, check out other MTB forums and ask around. The Service Manager at the shop I work at has experienced the same problem with CK headsets on higher travel bikes.

I'm going to try out the Cane Creek 110.

Not clear - what is rocking back and forth?

[Rob]

The top bearing cover.

[Collette]

Originally Posted by Mudman

So I can ride a different one every day.

So you want 365 different bikes then?

[Mudman]

Originally Posted by Collette

So you want 365 different bikes then?

if I could then yeah!

[alank]

Originally Posted by Rob

The top bearing cover.

Okay, but my question is how does having a separate compression ring affect bearing preload versus the Chris King design in a way that would cause this rocking? Its not a big deal though - maybe I'll try your bike out - we should hook up for a ride.

[Rob]

A split compression ring will maintain even and permanent adjustment, no matter how much side load is put on the top cup.

Because the compression ring on the CK headset's are built into the top cup when heavy loads are put on the bars it can cause movement and not give you a perfect 100% area of contact between the compression ring and the angular contact area of the top bearing.

This same thing happens when you install a CK headset on a bike that has Cantilever brakes on the front and has the hanger built into one of the headset spacers. Once you have it all installed and pull the front brakes you can actually see a difference in the amount of gap between the top cup and the upper bearing from front to back. And this is with a hanger with a locking bolt. I had a CK headset installed on my Surly LHT with canti's in front. I'd get the same noise/clunk I get on my El Guapo when I sprinted and pulled hard on the bars. I switched over to a Cane Creek HS that had a split compression ring and it immediately fixed the problem.

Not trying to bash on CK or anything, I'm just relaying my experience.

[RacinJason]

Well Rob, you have a point. The CK head set cap and race is somewhat floating on an O ring. They do this so that the tolerances allow for many types and brands of forks. (Great Observation)

1 1/8 in. to some companies can fluctuate. As you will notice building many bikes, some forks are a tight fit in the cap/race. Some are not. They found a sweet spot.
That o ring allows a slight movement. This is why they give you a Teflon sleeve. This lets it move a small amount and not make noise.

The amount of movement is so slight, if any, that when adjusted properly it is unnoticeable.

The race on the crown and the cap are designed to fit tight into the inner race on the cartridge bearing.
It should not slip, ever.

Many of the people who have had failures with CK head sets are people misusing them. If you run any head set loose, it will be destroyed in a matter of hours, depending on the type of riding you are doing.

Sometimes when a fork bushing is sticky or dry, it can seize and can damage head sets. That applies to any brand and style.

Originally Posted by Rob

A split compression ring will maintain even and permanent adjustment, no matter how much side load is put on the top cup.

Because the compression ring on the CK headset's are built into the top cup when heavy loads are put on the bars it can cause movement and not give you a perfect 100% area of contact between the compression ring and the angular contact area of the top bearing.

This same thing happens when you install a CK headset on a bike that has Cantilever brakes on the front and has the hanger built into one of the headset spacers. Once you have it all installed and pull the front brakes you can actually see a difference in the amount of gap between the top cup and the upper bearing from front to back. And this is with a hanger with a locking bolt. I had a CK headset installed on my Surly LHT with canti's in front. I'd get the same noise/clunk I get on my El Guapo when I sprinted and pulled hard on the bars. I switched over to a Cane Creek HS that had a split compression ring and it immediately fixed the problem.

Not trying to bash on CK or anything, I'm just relaying my experience.

[Rob]

Yeah I tried it with and without the plastic sleeve and no dice. I think it just makes a lot of sense to use a split compression ring and then a top cap. This rules out any problem at all.

I think this is just as pretty as a CK anyways.

[RacinJason]

I have used the Hope, Cane Creek, FSA ,Tange and many others.
Call me and I can tell you abour all of them.

[Do Work]

Originally Posted by BFloFoxRider.

the candy orange is pretty sweet too... so alank whats the price of one of these built up?? spill the beans!

Anyone out there have the answer to the million dollar question...anyone...hellllooooo...

[Pugz]

I wanna know the price, those are some really sweet looking bikes.

[Do Work]

Bump....

[RacinJason]

Around $4200.00 - $4500.00 depending on the build.

[project_d]

Originally Posted by Rob

Yeah I tried it with and without the plastic sleeve and no dice. I think it just makes a lot of sense to use a split compression ring and then a top cap. This rules out any problem at all.

I think this is just as pretty as a CK anyways.

Those are pretty sweet lookin'

[Steven Jackson]

Duzz that bike cum with a box of tampons?

[RacinJason]

No but we are installing a swiveling beer holder.

Originally Posted by Steven Jackson

Duzz that bike cum with a box of tampons?

[Dino Brown]

Originally Posted by RacinJason

No but we are installing a swiveling beer holder.

Swiveling beer holder?
Looks like you just sold three bikes: Brewmaster, JasonMason and Katonk!