As for the reliability and durability of the smaller bearings, I wouldn't be concerned as I've raced very hard for 30+ years of actual competition pylon autocrossing (SCCA, etc), as well as recent years of very hard hi-speed road course events (HSAX/HPDE). When I've just now taken the old small bearings out, they still looked excellent and didn't have any problems.

The larger bearings are perhaps better for extended durability, but I've had no problems with the smaller bearings from very hard racing (AX/HSAX/HPDE)/driving.

Last edited by Mopar Mitch; 12/18/18 07:58 PM.
Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!