I have +6 on mine, which makes hill climbing extermely easy, but if you plan on doing a lot of jumping I think that +4 would be fine. Mine still jumps okay but not nearly as good as my 1st shee with no +. As far as donuts and sliding it is way easier, no turning over or almosts. I doubt +2 would make that much of a difference, so I say +4 but thats just my opinion.