Do bike upgrades actually speed you up?

Or just aesthetic? If they do speed you up, how much of a relative edge do you get? Getting crushed out there so need every (acceptable) advantage I can get. Although even in a state of just trying to keep up, I’m on my way to getting in the best shape of my life.

Yes, they do make you go faster.

Here is a guide: Zwift Shopping Guide: What To Buy At Each Level | Zwift Insider


Thank you!!