RR-Racing Sport Performance and AP-Racing Essex Initial Comparison

[ajc209]

You're not missing anything. You are quite right if it is indeed true that the calipers are the same distance from the hub.

[JRitt]

Originally Posted by Pat

Shouldn't the calculations use the same diameter, as the pad is the same distance from the hub with all four stages? If one disc is larger than another, yet uses the same pad/caliper/carrier, I don't think that changes the outcome. That just means there is some unswept area outside of the pad.
What am I missing here?

Yes, you are correct. That is called the disc's 'effective radius.' If all four of the RR kits have the same effective radius and piston bores, then the torque output is the same on all four kits.

That begs the question though, why would you want extra unswept disc area outside/above of the pads on some of the kits, but not on the others?

[DAEMANO]

Thermal capacity for greater or less cost? Availability of parts? None of the above?

[ajc209]

Standard parts /I suspect. Ones a standard STI Brembo disc, the other a Colman Racing disc ring.

[Captain Snooze]

Originally Posted by CSG Mike

the Brembo *is* the superior product.

Just curious. In what way are the Brembos superior?

[CSG Mike]

Originally Posted by Captain Snooze

Just curious. In what way are the Brembos superior?

Construction, materials, finish, tolerances, the list goes on and on. The problem is, it also costs more.

It's the same way a Ferrari 488 is more car than a BMW M4, which is more car than a 370Z.