[SLAYER2003]

Just curious as to how the adjustable head angle found a few manufacturers (commencal) bikes work.

Do they use eccentric bushings or spherical bearings or something?

Do they use proprietary headsets or can these somehow use any headset like a King?

Can anybody explain this or have some pics, links, diagrams, etc.?

Thanks.

Oh, sorry if this is the wrong forum, but I know it is the most viewed and it seems as relevant to "Downhill" as 90% of the rest of the posts.

 

[DirtyMike]

eccentric bushings ?

.

Not really a Bushing, more like a sleeve in the headtube

 

[SLAYER2003]

Cool. But how does it work.

If the top and bottom is eccentric to the the Head tube it would still be at the same angle. Unless the eccentric hole was at a slight angle which it seems would require a spherical bearing or something.

If these eccentric spacers are not aligned perfectly is there the possibility of sde to side anlgle?

When they are adjustable from 68 to 73 degrees, is this via tool adjustment or the swapping of spacers?

In the case of the commencal, they refer to it as "cam adjustable". what is this?

Thanks

 

[ire]

Not really a Bushing, more like a sleeve in the headtube

Bingo, my Scott High Octane is knurled (to keep it from slipping) and you take a big wrench and slowly turn the sleeve and it adjusts the head tube angle (the steer tube is offset to one side of the sleeve).

 

[ire]

Cool. But how does it work.

If the top and bottom is eccentric to the the Head tube it would still be at the same angle. Unless the eccentric hole was at a slight angle which it seems would require a spherical bearing or something.

If these eccentric spacers are not aligned perfectly is there the possibility of sde to side anlgle?

When they are adjustable from 68 to 73 degrees, is this via tool adjustment or the swapping of spacers?

In the case of the commencal, they refer to it as "cam adjustable". what is this?

Thanks

The hole for the steer tube is normal, but offset in the sleeve....so it doesn't require any type of bearing to adjust.

 

[DirtyMike]

Right nteh commencal basically has one of two setting's steep and slacked, goes in one way or the other, loosen teh clamp, turn it around reclamp, done. Trying to find some pics

 

[SLAYER2003]

Scroll down in this thread to the commencal:

http://www.nsmb.com/shore_news/interbike06_3.php

"The cam adjustable head tube allows a head angle range of 68-73 degrees."

How is this done via adjustment unless it is 68 or 73? It seems to be 68 through 73? Unless it is with a bunch of swappable spacers which would cancel out "cam adjustable"....

 

[Bicyclist]

Dude, it's just a sleeve drilled off-center. You rotate it one way and it steepens it, and the other it slackens it. The center-bored one is "regular", just sleeved.