As a followup to what you made for Kart, these tracks are definitely way nicer in terms of both looks and layout. It's clear that the new tools have benefited you. However to give some critique, I feel like some of the tracks could be a little bigger primarily red rock, green hill and high speed ring.
They feel alright on gear 2, but end up feeling way too cramped on gear 3 in my opinion. And also you may want to look into errors with these maps, because high speed ring and palm rock speedway immediately sigsev upon finishing a race from my experience. Loading the pack also gives console errors regarding textures, not sure if that is playing a part.
But other than that, nice stuff so far. Hope it can continue to grow.