So I've been running with a fire department truck that's gotten me around great for roughly two months now. I recently found a performance tire to replace one of the back wheels that were at 50% and aired up all the tires while I was at it cause they were mostly at about half capacity.

Now the acceleration is great but now my braking and general handling has gone out the window. Now it feels like I get faster a lot easier but have to slam on the brakes now where as before it was generally a lot less floaty.

What gives?