Anti Dive Advice

[Angry Bloke]

I'm just in the process of fettling my anti dive as it is a bit too stiff at the front end.

I have made a tie rod using rose joints with left/right threads to give me some insitu adjustment but wonder how changing the operating angles will affect it.








So Two questions

-What will happen if I increase/decrease the tie bar length

- More importantly what will be the effect if I cut back the length of the weld on tab (behind the damper in pic 3) in order to give more scope for tie bar length adjustment

Cheers

[soulsurfer]

Looking at your pictures, it isn't the tie bar length but the position of the tie bar on the forks that's causing your problems. Personally I think a longer bar is needed with the fixing point in front of the forks, and lower down. What you need to create is almost, but just less than, a parallelogram between the two fixing points of the tie bar and the spindle nut and fork bolt. Your existing setup looks like when you go over a bump it's still forcing the tie bar into the fork leg. A well set up anti dive will have no effect on your suspension travel, until you apply the brakes. In my example the lower the fixing point, the red line on the front of the forks will give slight increase in dive when the brakes are applied, which IMO is a better feel.
Hopefully this will demonstrate what I'm trying to say...

[RICSPEED]

also to add to that a high possition also has the slight effect of moving the caliper away from center with suspention travel ,not a great problem but it could be if it is tight between caliper and rim

[Angry Bloke]

Thanks Ricspeed ...................and Thanks again Mike

[wack 63]

When you say it is too stiff on the front end,do you mean when you bounce the front or when you have ridden the scoot as it may be that your springs and damper set up is too hard.The anti dive only works when braking ,so you could try removing one of the arm bolts then bounce the suspension without using the front brake.Also the caliper plate needs to be able to swivel freely on the axle to allow the suspension to work. There is probably a correct height as to where to weld the lug on the forks ,perhaps Frank Sanderson could help?

[Angry Bloke]

^^ Thanks Wack- The problem is that under braking condition the front end is stiff.

I've just finished reading the thread that soulsurfer started and linked above - Very interesting

Now off to the shed with my spring calipers,compasses and vernier to have a play

[Chris CSPE]

Wack 63 is right there, a solid caliper plate and a tie bar fitted prevents any movement on the links.