I just fiddled around to find my preferred combination, which is:
Blue Seven for speed and for aesthetic coolness
Sponge wheels for moderate speed and better handling, plus they go with the kart body better than the Mushroom ones
Parafoil, for purely aesthetic reasons.
And ofc Shy Guy. I just mix Speed with handling, which has worked out well for me. I think that too many people focus on speed, meaning they lose out on control. Hence, I play this to my advantage, hence why I choose and tend to do well on courses which require drifting as their main focus (Koopa City, Bowser Castle.) hehe
I also just looked up who Rachel was (US X Factor) and HOW DARE THEY. I saw her first audition, she was great. 'Hey, I'm a gurl, I need my own bathroom'