Thread: Suspension Geometry

For the D1, yes, though I'm not sure how much it would be on a non lifted D1.

It has to do with the angle of the radius arms, as they rotate in a circle about the chassis mount as the axle moves up and down (hence their name). On lifted vehicles (unless the radius arm chassis mount has been modified/dropped) the angle of the arm from the chassis is greater, so as the axle travels up it moves forward further (its actually further back to start with, unless the arm has been lengthened to create a larger circle of movement).

I hope that makes sense. I'd draw a diagram except I'm on my phone.

Yep, that makes sense.
Just choosing tyres but i don't like chopping into my Disco like others.

I think 245/70 is as big as you can go before chopping is needed

That would be with no lift i presume?

I have 245/75 and mine rubbed on the back so i did a camel cut. Not such a big deal. The front is ok. Mine has an arb bull bar though.
I had to increase the turning stops as well, as i was getting rubbing on full lock against the radius arms. Seems my vehicle is one of a few that get this. Not sure if mine is lifted. I think it was originally and has sagged a bit. I might be wrong.

Originally Posted by Finnius

That would be with no lift i presume?

Suspension lift makes no difference on the size tyres you can run. But yes, 245/70's are as big as you can go without rubbing.

Rick1970, Yes a suspension lift does let you run bigger tyres.
A body lift moves the body further away from the chassis and the diff (wheel center) - what a suspension lift does is moves the chassis and body away from the diff (wheel center). Thus both let you clear bigger tyres.
As such - I am running 245/75's with a suspension lift, no body lift, not cuts anywhere and no chance at all of rubbing (inches of clearance).