Toe-in

[Rare Scottish Tree Badger]

What should I go with for MX racing? ... I've fitted a New set of TUSK chromoly tie rods and ends as the Yamaha ones were either bending or snapping!! What a difference, I aint going to bend these. Not that it makes a difference, but I'm running +2+1 Laeger A-arms.

 

The Yamaha Service Manual calls for:

"Place the machine on a level place"

"0-10mm toe-in"

 

What do you guys set your toe in at, and at what position should I measure it at? (I know how to measure). But depending on the position of the bike, it varies.

 

What I mean is:

 

If I lift the bike at the front, give it a good shake in the air, and rest it gently on the ground, I get a reading of 13mm toe-in.

 

If I bounce all my weight on the front and come off it slowly, I get a toe-OUT of 16mm.

 

Any ideas?

 

Rare.

[jeffro189]

i would set it up like i would set up a car. first you jounce the font end to let the suspension settle, then you make your adjustments.

[trigg]

bounce one the front to settle the front down then set the toe in to 10 degrees camber to 4 degrees negative.

works for me here down south

[fixitrod]

Here's a quote I found from http://www.atvconnection.com/atvconnection...on-Up-Grade.cfm

 

For motocross you will want as much as 4.5 degrees of negative camber. The typical recreational rider is okay with between 0 and 3 degrees of negative camber.

 

and

 

Toe-in is when the front of the tire points in more than the rear. You should set your toe by giving a slight toe-in. Usually toe-in to 1/8" this will help when turning your ATV.

[fixitrod]

Here are some good numbers and and excellent write up I got from http://www.lsracing.com/installguides.php?step=4&igid=5

 

 

CASTER & CAMBER TUTORIAL POSTED: 2002-06-03

 

 

CAMBER

Camber is the amount of degrees that the tire and wheel is tilted in or out at the top in relation to the bottom of the tire. A tire that is tilted in at the top and out at the bottom is said to have negative camber. The farther it angles out at the bottom the greater the amount of negative camber.

 

For positive camber, the top of the tire is farther out than the bottom. The reason for having camber in your front end is as follows. An ATV's suspension is forced over in a corner and the suspension flexes. With everything in motion, all this force wants to flex the tire more upright, or reducing the amount of negative camber.

 

A tire's greatest traction is achieved when more of the tread is in contact with the ground. As the bike enters a corner, the forces tend to bend everything over, adding positive camber. To make sure that the tire's greatest amount of tread is in full contact when it is most needed, we set up the front suspension with a negative camber. How much negative camber you choose depends on the amount of suspension travel, and some various other factors such as the terrain you plan to ride on.

 

Recommended Camber: Negative

 

Motocross: 4.5