Michael confessed to being a hack:
Quote:
People said steel wheels would work, and I bent my Forester's steel wheels first time out.
Thanks...
And Dustin believes in steel wheels, but we had two wheel centers crack on the Toyota early in it's career. Admittedly, we had 6 or 7 drivers practicing plowing at the time. Steel wheels are more flexible than aluminum wheels because the material is thinner. The more that the wheel flexes, the more the material fatigues, eventually leading to cracks. Aluminum wheels can also fatigue but the loads that the wheel can take before beginning to crack are generally higher. No long, boring engineering explanation here, but the thicker the wheel the stiffer,... and stiffer is better
I think that the only reason NASCAR requires steel wheels is that they can take a big hit and bend without breaking and sending debris onto the track. And everyone knows that in NASCAR, "rubbin' is racin".
An interesting comment from a past article on racing steel wheels concerned using Krylon paint on the wheels because the paint was brittle and would crack with the wheel and reveal the problem, whereas tougher paints would bridge the crack until it was too late.
Charlie G