San Andreas advice

[Lid]

The rear swing arm wil allways travell through the same path because of the single pivot point on the frame.
Lower bb and shorter travell would make me think that they were trying to have different horses for different courses.
Changing the travell in the back and the bb height would really affect the angles.....dont remember the front fork being adjustable to compensate?

 

[orange71]

yes but the path (i.e range of movement) will be shorter if the shock is more vertical (i.e. further down the frame) won't it?

 

[Lid]

So assuming that the shock has only a set amount of travell...moving it up and down would not change the set amount of travell. Or would it?

 

[cherrybomb]

Why would the shock get more vertical? If you look at the mounting points, it will move (as near as damn it) in a straight line.

To have any real effect on travel you need to change the distance between the swing arm pivot and the shock mount on the swing arm.

Shorter the difference, longer the travel.


Moving the shock in the mounts on the frame just 'move' the arc of travel, they don't effect it's length. If you move the shock to the forward mount, the BB will be at it's lowest setting because of the swingarms possition. BUT the swing arm will have a higher maximum point of travel to compensate.

 

[cce]

I get the lower BB, but why less travel? :?

the back wheel's position in relation to the main frame would be closer on a higher pivot?

 

[cherrybomb]

Marginally, but why would that effect travel. Travel is effected by the stroke length of the shock, and leverage. Moving the shock in those mounts alters neither.

 

[cce]

mr orange71, you know what needs to be done. in the name of retrobikers limited remaining sanity, you must tinker!

 

[cherrybomb]

/\I'm with stupid /\

 

[Anthony]

Isn't it going to have more effect on the front end than the back? I can't see that it would affect rear travel much if at all, but surely the further forward you mount the shock, the lower the bb and the slacker the head angle becomes? So maybe you do it when you're running the fork with more sag for freeriding/whatever? And the rear position is for harder fork/cross-country riding?

 

[Lid]

Again the path of travell wil allways be the same. Just imagine taking the shock right out. The rear wheel will just move in the same path.

I think that the leverage and BB height will change here but not the amount of travell.