These are the hubs:
http://www.mamotorworks.com/corvette...-371-9628.html
http://www.pfadtracing.com/catalog/p...roducts_id/125
From the first link:
The SKF C5 & C6 Corvette Racing Hub unit is designed to provide high stiffness during cornering, thereby reducing piston knock-back and the need to tap the brakes (confidence tap). It is also designed for durability and to maintain preload at sustained loading of 1.2g! All this adds up to faster lap times and better driver feedback.
If you have upgraded your 1997-2008 Corvette's performance, you will want these SKF hubs. You gain increased stiffness for better brake performance under high loads, higher preloads, less than 10 micron run-out and much increased durability. Under race and competitive use you may go an entire season without replacement. Improve your Corvette's handling, brake performance and hub durability.
Here is a YouTube animation of the difference in the SKF hubs:
https://www.youtube.com/watch?v=3QyrgnQUXHI
