"Roger Shoaf" wrote:

I am not really sure of the definition of grinding

I mean sliding.

that you are referring to, but from the description you supply, it
appears that what you are looking for are wear plates.

Yes, something durable that might slide on concrete.

I would suggest HDPE or the even harder version of the Ultra high
density polyethylene. This is what they use in gravel chutes to
resist wear. It is slippery and will not impart wear on the
curbs.

Right, not trying to damage the pavement, but slippery is the first
concern.

Thanks.