Hey guys, I am noticing that my rear tires are wearing faster on the inside part compared to that outside. I always take the car for alignment and general wheel checking around once every 6 months just to be safe and the values for the wheels are in the specified ranges by the manufacturer.

Any ideas what could be causing the inside of the rears to wear down faster?

Yes, I've already searched around the forum, but nothing really stood out to me as a possible cause.

 

Negative rear camber. Common on our cars for handling/cornering. Try searching 'rear camber arms'.
You need to get a set of adjustable camber arms to correct the issue. Very easy to purchase and very easy to install.

James

 

It's the type of tires you have. The same thing happened only with my General tires. Had to reduce the air pressure several psi lower to correct it.

 

So how much am i looking at cost wise for the camber arms? I'm not too technical with cars to know how to put them on.

Also my tires are the standard size that comes with the crossfire for all the wheels. I keep them between 32 and 33 psi.

 

Is the wear smooth or jagged? Smooth=camber; jagged=toe

 

Smooth, no other issues wear wise.

 

So what tires are wearing out on the inside for you? Mine were General Exclaims.

 

I have the same problem, but if it was the tire brand wouldnt lowering pressure make that inside wear even faster?

 

Having your tires "rotated" will extend the tread life as well.
Place the outside of the passenger side tire, on the inside of the drivers side wheels.
And yes, lowering the tire pressure should make the outer edge of the tread wear out faster.

 

The tires currently on the back are Achilles ATRs, which probably aren't the best of the best hahaha. But how would you rotate the tires +fireamx the way you said, because they have to be mounted on the wheels a certain direction no?

 

I'm running General Exclaims on the rear too. Outside of them being crappy tires that I wouldn't buy again I have no abnormal wear issues. Have about 24,000 miles on this set.

 

The camber is easy to check, I did a posting on it, just need a ruler and a level. Your rear camber is adjustable, you need the arms to fix it. I adjusted my rear camber to be between the rear of a IRS mustang and a Vett settings. Read the post and youll be able to fix it easy peaszy. Woody

 

Excellent! What PSI do you keep them at?

 

Anyone know how much the adjustment kit would cost me? And also, does running at a lower PSI really help the issue?

 

It's a known fact that over inflating the tires would cause the inside to wear faster than the outside. I had no problems with the other 2 sets of tires I had previously set at 36 psi. The General Exclaims with 36 psi didn't run right on my car, so I dropped them down to 32 which did help. Not sure why different tires would have affected it like that.

 

Adrian-x, PM or email me. I make adjustable camber arms, track bars, trailing links and sway bar links for the Crossfire/R170. If you search 'adjustable camber arms' you should find info and pics too.

michaelrydquist@msn.com

 

Have the tires taken off the existing rim they are on and moved to the other side. Inside is now outside.
Or, flip it on its rim and move to other side. Same result, but I'm pretty sure this will result in the TPMS light coming on.

 

Would it be possible to use the stock rubber bushes if a fixed camber arm was made with a hole pitch that gave a better camber. Or are they molded in place? New bushings could be made if they are. The pitch would be based on one that suited most situations. I just think that the rubber bushing would be better for most general situations where people wanted better tire wear and were not looking for that final tweak.

There can't be much to machining a new bar and it could have the curve for clearance like the OEM one has if I recall correctly. I have never studied this at all but the rear tires I have just replaced had quite a large difference in tire wear inside to out, I hate to see the new ones suffer the same fate, without dismounting and switching them to the other side once in a while.

I think James went for an extra 1/4" pitch and was satisfied with that.

 

I have Mike R's adjustable rear camber bars with an otherwise stock suspension and they are GREAT. I used them to adjust the rear camber from -1.3* to -0.5*. This put the tire contact patch flatter on the ground which helps my launch when drag racing, but still gives enough negative camber for great cornering on the street.

They squeaked a little when first installed, but it stopped as they broke in.