tire moving on rim at the track

[kk2002s]

So in off road motorcycling, many tubeless tires and rims use a Rim lock device to lock the bead down to the rim. Off road car/truck racers have to lock the beads down on to the rim so it makes perfect sense that a sports car on a track would do the same thing.

[BYprodriver]

Originally Posted by kk2002s

So in off road motorcycling, many tubeless tires and rims use a Rim lock device to lock the bead down to the rim. Off road car/truck racers have to lock the beads down on to the rim so it makes perfect sense that a sports car on a track would do the same thing.

Most likely because of the low air pressure for off road traction.

[maytag]

Originally Posted by BYprodriver

Most likely because of the low air pressure for off road traction.

This is precisely why.
When we're off-roading / Rock Crawling, we air down a LOT. When we're building a purpose-built machine that'll do that regularly, we use beadlocks. Not because the low-pressure has inherently less grip to the wheel (it might?), but because lower pressure means more sidewall flex. the sidewall flex is what deforms the bead, and creates a "loose" bead, which slips tires on wheels and sometimes deflates a tire altogether.

This is why I think Racerboy's idea has some distinct merit.

Originally Posted by Racerboy

"As you exit the turn, you ride up onto to the curbing, which normally is not smooth; the curbing has a washboard design. The tire is going through a consistent grip/no grip action, experiencing a rat-a-tat-a-tat of forces to it's sidewall. The tire moves a tiny amount on the rim each time this happens. Do that enough times, and the tire ends up moving on the rim enough to notice."

If there's something I do plenty of at the track, it's use the curbs. :dance: