Grinding your rim does not have alot of difference on how easy your rim dents, its all down to the weight and smoothness of the rider. If you go and run for example 12psi you are obviously going to dent your rim easily, But when you run hard pressure it will make it harder to dent your rim but also puts stress on your spokes and wheelbuild. As for the pads, Zoo pads are still avaliable at trials uk For £15 posted. Then again if you see sense and decide to grind your rim, either go for koxx bloxx greens or plazmatic crm's. Oh and by the way, koxx try-all rims are not strong. Dan.