This is exactly what I was talking about. People like to assume that a simple math equation tells the whole story, while ignoring the fact that bikers do more than just exist as rigid attachments to a bike that travels in straight lines.

I can do the math, but I can also swap wheels in a matter of minutes and feel the very obvious difference.

I'm talking about 29" mountain bike wheels, where the mass and moment of inertia is significantly more than what you see on 26" road bikes. It's palpable.

Maneuvering the bike in the air is another place where the mass difference is noticeable. Dropping 500g doesn't sound like much when you think about holding 500g in your hand, but it's a different story when that mass is on the ends of a 48" long wheelbase and you're trying to maneuver it in the 0.5s that you're in the air.

If you're just riding something like your tri bike in a straight line down a smooth asphalt road at a constant velocity then it obviously doesn't matter, though.