Big Brake Kit Discovery

[Lil Abner]

Originally Posted by cdydjded

You did not understand what I put. Obviously the tire & the rotor rotate the same revolutions. My point in using the tire calculator is cause you can use a taller tire or shorter tire which would apply to a rotor with a 12" diameter (taller) or 10" diameter (shorter). My point is no mater what it is a tire, a rotor anything with a circumference, the bigger it is the slower it rotates, the smaller it is the faster it rotates.

I get what you're saying, I just think you're using the wrong terminology. No offense, so don't take this as me being a d**k. When you say "rotates faster" or "rotates slower" you're referring to angular velocity, or the RPM's.

Look at it like what a previous poster said. If something has a set angular velocity (let's say 2,000 rpm), then you can determine the linear velocity at different points away from the center. The linear velocity at a point away from the center is (omega) * (r). (Omega) is the angular velocity, (r) is the radius. Looking at that basic equation, the larger diameter has a larger linear velocity than the smaller diameter since (omega) remains constant.

Tires and the rolling diameter is a different can of peanuts because they are driven from the center and the outer diameter.

Again, I'm just trying to help confusion, and not be a blankity-blank.