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Less force/weight is directed towards the ground by elevating the front....
This in mind...
1. Our tires are run at low psi, compress, and grip well.
2.When we brake or initiate a turn the front suspention is going to "dive" a bit placing the front of the bike lower than the rear of the bike.(realativly) Not to mention our low psi tires compress further lowering the bike.
3.This is due to the new force (direction change) applied to the bike. If the front is slightly lower than the rear, or has too much weight on it, the tire want to grip and turn however the rear wheels under power want to track forward or still.
4.Thus you get a force (vector) that wants to push the vehicle forward and into the ground (now that the vehicle is no longer using all of its power to go staight, some of that enegy is focused down into the ground....moments before and during a turn)

...this resistance to turning (pushing down and into the ground...still going staight is)...or... "pushing."

Therefore, If we raise the frontend of our bikes via....umm...larger tires when we brake or initiate a turn the front starts off higher and stays proportionally higher thus vectoring less force into the ground and the tires are able to change the direction of the vehicle without fighting the momentum of the bike going forward. Granted as with everything if we keep going bigger and bigger we are going to run into a situation where we don't have enough weight on the front tire to turn the vehicle and thus creating a similar issue. (all about moderation)

I don't know if that will help you...its about as clear as mud but the best I could do right now. its been a horribly long day.

oh and sorry about the horrible spelling....just dont care right now
 

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also look up physics of understeer instead of "push" on google and it will talk more about the forces involved. Wiki has a decent article. Keep in mind ...i'm not an engineer, know only basic physics....but that i how i think of understeer as related to the suspension setup on our quads.
 
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