Alignment problems usually (in my experience) produce uneven wear across the tire surface (outside edge, inside edge) due to scuffing, rather than a cupped pattern.  Bad suspension can produce cupping.  mcneely

---- Eric Caron <ecaron1@COMCAST.NET> wrote: 
> Hi folks,
> 
>         Before leaving for Bus fusion I noticed that my front passenger tire is cupping on the outside edge.  all other tires are smooth.  tires have only about 3,000 miles on them.  I check pressure regularly and keep them all at 48 PSI. My van sticker says 48 rear and 39 front.
> 
> tires are 1 year old General Ultimax. 
> 
> Van was aligned 2 years and less then 6,000 miles ago and still drives straight down the road.
>  
> it seems strange that only one tire and only one side of the tire is cupping. It is mild at this point.  i can feel it but people can’t see it and often can’t see it until I have them move their hand over the tire.
> 
> 
>         I have some recommendations as to what to try but I wanted to ask the list for ideas before I start purchasing things.
> 
> bus fusion by the way was amazing with over 200 buses and so many great people. It was a long drive from VT to Almonte Ontario but  now I have another reason to try to keep this bus running great.
> 
> Eric Caron 
> 85 GL auto Westfalia 

--
David McNeely