I bought new Hankook AH11 tires last year for my 1996 GBM on a P-30 chassis. The tires have been good and the MH steers well, I drive it with one hand, is not affected by passing trucks. However after 15,000 miles I have a slight wearing on the inside tread of both tires. I think its called positive camber. I would assume that a positive camber is a more stable ride than a negative camber. Does anyone know the specs for aligning the front end of a 1995 15,500 lb P-30 chassis? In 2006 I had the front end rebuilt along with new Monroe shocks, Henderson super springs and L/H bell crank a long with the front end alignment.

Gjac, tires wearing on the inside edges is negative camber, but this can also be caused by too much toe out - or a combination of both. I have a 1993 Georgie Boy built on a Chevy P30 independant suspension. When I had it aligned last,the camber was set to +1/2 on the left and +1/4 degree on the right side. The caster was set evenly on both sides at +3 degrees with total toe set at 1/16 toe-in. Bill

Gjac.....If they're wearing the same on both inside edges, that is generally a toe-in/toe-out/ adjustment. Typically, the inside wear is too much toe-in. You can do a poor mans check and to see where you're at by measuring from tread center to tread center on both wheels on the back side of the tire and then the front side of the tire. The difference will give you either your toe-in measurement or toe-out measurement.You should have the coach aligned by a good alignment shop. Do what they call a four corner alignment. They use a laser to make sure the rear wheels re running the same direction as the front. Typically, a truck alignment shop will charge $150.00. Once the alignment is completed, the tires will continue to wear, even though the alignment has been corrected. The reason for this is that the area that is worn down, will now scuff off rubber which will wear as fast or faster than before. If you have a good set of duals, you could move both fronts to one side of the coach and make that one side your two new fronts. DON'T mix the fronts on the rear, keep them together as a set, otherwise you'll have two tires of different height (example....don't pull off both outer duals and swap for the fronts, just use the duals on one side).

I had mine aligned by Superior Spring in Hamden on State Street. They came recommended and when I went there they had dump trucks a rv and a fire truck there. Looked good. I handed them the specs from the SuperSteer site and told them that is what I wanted.

Make sure that the coach is loaded, when you do the alignment, just like it would be when you travel.

Tires wearing on inside | Good Sam Community

14 Replies

DSDP_Don
Explorer
May 24, 2013
Gjac....Glad you got it fixed. Even though it was expensive, it always feels good to know that everything is correct and will work well for a while now.

Thanks for coming back and posting your findings.
Gjac
Explorer III
May 24, 2013
I used the spec from Henderson's web site that you gave me. Superior Spring seemed familiar with them when I went over the specs with them. They were basically the same as what they had just a little tighter tolerance.
mike_brez
Explorer
May 24, 2013
Gary what alignment specs did you use?
Gjac
Explorer III
May 23, 2013
Just to update this thread, when I took the MH down for an alignment it need 3 parts which the shop could not find before it could be aligned. It took me several days to find the relay arm which is no longer made by GM. I was able find the part from Hendersons . It attaches to the bottom of the bell crank. I found the outer tie rod end and a arm shaft at Moog. The toe was off 1/8 in. So $800 later all is well again. Tomorrow I will have the front tires rotated to the back.
Gjac
Explorer III
Apr 18, 2013
I have not added any more weight to the rear of the MH.
randallb
Explorer
Apr 18, 2013
I am not 100% sure on the P-30 but on most GM products with IFS the camber goes negative if the front rises. If you recently added weight (stuff) to the rear storage compartments this will drop the rear and raise the front. Do you see the correlation between alignment, tire wear and moving weight around?
Randy
Gjac
Explorer III
Apr 17, 2013
I did check the toe today as Don suggested but it was the same from front to back. I thought I could check the camber the same way but I forgot the frame was in the way. I guess I will take it to Superior Spring for an alignment.
mike_brez
Explorer
Apr 17, 2013
SuperSteer
Gjac
Explorer III
Apr 17, 2013
Thanks for the quick replies. Don I started making a trammel bar to check the toe in dimensions. I guess I could check the camber on the top of the tire and bottom the same way. will do that tomorrow. Mike I did not find the specs on the Super steer/ Henderson web site. Can you post a link?
RayChez
Explorer
Apr 16, 2013
Need camber shims.

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Tires wearing on inside

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