I keep scrubbing the inside of the tires (mainly RHS) on my IRS rear end. I have adjusted for neutral toe, so I think it is a camber problem, but I cant see how to adjust it.

Here is a photo of how much it is scrubbing - the wear was even when the tires were fitted in April, and they have done less than 6,000 km.



I am hoping for suggestions .....

Convert to swing-axle, Jeff......that'll fix it.

Quote:

Originally posted by HappyDaze Convert to swing-axle, Jeff......that'll fix it.

hi

For maximum positive camber loosen the spring plate bolts and jack the trailing arm buy the shock mount and retighten, you need to make the V between the spring plate and trailing arm as sharp as you can.

Steve

That amount of wear appears to be a toe problem.
Check your toe on that side, wear indicates that it,s toeing out big time., how is your bushs and also spanner check all bolts on your spring plates.
Camber will wear like that also but it would need to be extreme camber.

Cheers Col

Just like colin said way too mutch toe out you need to toe them in a bit

Col, I set the toe by pulling up in a straight line with the bug, then running a string line down both sides of the car rims and past the trailer rims to get a straight ahead line, then measured to the front of the trailer rim and the back of the trailer rim. The passenger side was pretty good, but I had to adjust this one (drivers side). This was about 2 years ago, but it hasn't helped all that much.

Steve, so is this just picking up the play in the bolt holes - I wouldn't have thought there was that much movement there. I suppose I could check the camber angle with a square off the driveway onto the top & bottom of the rim. Does the suspension height change this? Maybe I should keep it wound up higher?

Jeff is this only since the roo,perhaps the wheelbase is different that side to the other you can check this either by the old chalk line method or tape.

Les, it is on my trailer. It has a type 111 rear suspension.



It has been doing it for years, and I have tried different things on and off, but it takes a while to see the result. I haven't worried too much, as I put new tires on the front of the bug, move the old front tires to the back of the bug, then move the old back tires to the trailer, so they are usually quite worn by then anyway.

Commodes do that.
Badly.
I have one (dammit).

Sometimes it can be set up fine, but when driving around corners the camber/toe goes miles out, but more importantly they "shimmy" the tyre, and it's toast. Usual fix is the inner bushes on the arm getting soft (even if they look great, they lose their durometer (LOL! Where did THAT word come from?!?!) and go squishy.

I'm with Mr Mackie, never saw these things on swing-axle cars...........

Do you carry a load in the trailer?
When weight is applied to the trailer the suspension will compress hence toe the tyres out and induce neg camber.
Maybe set the toe with weight in the trailer.
Modnrod , Commodores are famous for the rear wheels toeing out and neg camber coming on when you accelerate hard especially when pulling a trailer.

Cheers Col

You only have to look at the inside of your rear drivers mud flap to see your problem. It is worn just like your tyre. I would tend to agree with Col. Weight in the rear causes it to load up resulting in a combination of camber and toe = excessive wear.

Col, the trailer mostly has the tool box sitting in it (as in the photo) - I put it over the weigh bridge (out of curiosity) last year, and it goes about 700kgs for the trailer with this usual load in it. I often carry building materials and more tools on the trailer, and at times it would be double the weight. When I set the toe, it had the usual tool box in it, so the usual weight. I just set it about half way, where I normally run it. It is a bit hard to see in these photos, but the suspension is adjustable, and I wind it up & down to suit the load. The centre of the torsion tube (with the centre splines in it) has been cut out and made so it will rotate. It then had an arm bolted to it, a ratchet lever on the front of the trailer, and a threaded rod through the arm, so I can change the angle of the spring plates by rotating the centre splines.

Bat69, the mud flap is worn from hitting on the exhaust when it was on the car. I got new ones for the car, and moved these to the trailer. Good thought though.

I think I need to get time to try and see how much camber adjustment I can get in the bolt holes.