How hard are the stockers? We run on our old livingroom carpet upside-down (I know it sounds weird, but it gives AMAZING traction to Mini-Zs... Comparing the hardness of the M-Z and M-24 tires, which is harder/softer?
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...but if you REALLY want to earn your spots, you have to face that leopard that lives up on Rice Krispy Hill. I try to, but he always pushes me down the hill, and all of the tadpoles laugh at me!