tire moving on rim at the track

[Anker]

Originally Posted by NewArt

So, do street tires do this in day to day driving? Anyone checked?

If you bother to read all the printed material you get when the tires have been replaced you see see that you have to be careful with hard acceleration and brakind for a couple of days to prevent exactly this problem from happening.

[piper6909]

Originally Posted by Anker

If you bother to read all the printed material you get when the tires have been replaced you see see that you have to be careful with hard acceleration and brakind for a couple of days to prevent exactly this problem from happening.

Who bothers to read that!?? haha!

[NewArt]

Originally Posted by Anker

If you bother to read all the printed material you get when the tires have been replaced you see see that you have to be careful with hard acceleration and brakind for a couple of days to prevent exactly this problem from happening.

Haha, well I’m pretty gentle on my street tires but I don’t think that I’ll be avoiding hard acceleration/braking on my track tires!

[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: