I've gone 400/350 with the oils and feels perfect on what I would call a medium grip smooth indoor track. I'm going to pick up some gear diffs for when we go back outdoors with the astro. I'm quite a gentle driver so I feel for my driving the gear diffs make me push the buggy harder which I need on the high grip. I'll be sticking with balls indoors though, super smooth and just feel right :-)
Chris
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