Vic

Am I right in assuming using compression struts on the rear of my cossie can bring the wheel more to the centre of the wheel arch? (adjust castor)

I'm mainly looking to use these at the rear as I have some fairly large wheels going on soon, and by looking at the factory setup the wheel will be touching the side skirt if I was to put larger diameter sheels on.

My question is what will happen to the handling if the wheels are moved more towards the centre of the wheel arch? I have an adjustable rose jointed rear beam setup that will go on at the same time.

Do I also have to use comp struts at the front? I'm a tad confused when it comes to suspension!

Any help is much appreciated

xr4x4rs

iTrader: (5)

what size wheels you thinking?

19s cango on using std rear beam and front roll bar no need to change to compression struts

Vic

18s with a 255/35 size tyre.

what size tyres have you seen with 19s?

NEIL A

iTrader: (6)

you will struggle wth 255 tires most people run 225 but can get 235 on with rolled arches. The safs that i have seen on 19's run 215/35 tires, but you might squeeze a 225/35 on.

Vic

whoops double post

Vic

ive edited the 1st post, meant toi say that these are for the rears. I'm putting 225/35/18s at the front which should fit no probs.

Its the 255/35/18 im worried about at the rear.

Arches have been rolled and plastic arches have been trimmed already.

I currently have 8x17s with an et16 on the back. Width wise, I dont think I'll have a problem. Its the diameter that has me worried

THEYGOTMETOO

Compression struts on the rear? How? You can't fit compression struts to the rear; the design of the rear suspension doesn't allow for it. The only practical way I can think of to centralise the wheel more is to move the arm to beam mounting points forward (I’m assuming the wheel needs to be moved forward?)

Bearing in mind the semi-trailing arm design on the rear end of a Cossie, technically speaking there is no castor angle.

Bringing the wheel forward more in the ways mentioned above will only shorten the wheel base; it won’t affect any of the suspension geometry with regards to the arms. In general long wheelbase = higher stability, short wheel base = more twitchy but more “agile” but to be honest I bet the amount you need to move the wheel is so small you probably won’t notice any difference.


Personally I hate semi-trailing arms - absolutely ridiculous design

xr4x4rs

iTrader: (5)

carnt see there being a problem with teh diameter of the wheel mate

most people run 215/35/18 and have no problems

35 bit is the how tall teh tyre is and if others are running it then you will be fine

the only problem youwill have is running sucha wide tyre, as 255 is a tad wide

dojj

iTrader: (3)

where is mr rainbird when you need a right long essay explaning about rear beams then

you'll just need to twaek the settings on the rear beam if it's all jointed up anyway to get it right in the first place so i wouldn't be running mega wheels on teh back because they are just going to scrub like buggery if it's wrong and then you'll be wanting tyres on a hurry

as for the fronts you can use the copresion struts along with adjustable lower arms, coil overs and adjustable top mounts complete with a relocated arb on the front if you want total adjustablilty

Vic

thanks for the help. By the sounds of it the rose joints on my new rear beam will give me the clearance I need.

I've noticed that on the one side of the rear wheels is MUCH closer to the side skirt than the other side. I've also noticed the front right side wheel is a MUCH closer to the front bumper. Is this normal?

I've got top mount adjustables for the front, will these be OK to adjust the wheel back to the centre? At the moment the 215/40/17s are only a few mms clearance.

xr4x4rs

iTrader: (5)

well you can get 18s and 19s on std sierras using std beams etc

if one side is close then obvioulsy something is wrong somewhere and you dont want to go adjusting things just to fit the wheels as it wil drive like a big

also regarding the front end

4x4 anti roll bars move the whels closer to the front bumper than 2wd

2wd are more central on the front

if its 4wd ten its normal for the front wheels to be fairly close to the bumper anyhow

Vic

yeah its a 3 door, so i have a 2wd roll bar. Still, the front right wheel is VERY close to the bumper

xr4x4rs

iTrader: (5)

well before going out and buying stuff thats not needed as 18s will fit on anyhow

id go take it to a specialist and have everything checked to make sure nothing is bent