GoPro Inside a Car Tire (With Balance Beads)
Warped Perception
I enjoyed the heck out of this video. Comment from @GlutenEruption explains how they work:
They work because the tire is rotating around its *center of mass*. If the tire has a heavy spot, the center of mass is going to be offset towards it, Meaning even though the heavy spot itself wants to be flung outward from a static reference frame, from the rotating reference frame of the tire, the heavy spot is actually staying closer to the center and the light spot is being flung outwards the farthest. The beads, which are free to move and not a connected to the tire at all only move via centripetal force of the tire trying to pull them back to the center, and they'll collect in the high spot which is the light spot.
On the balance machine the old beat up tire got better numbers that the new tire.
ReplyDeletexoxoxoBruce
If the beads worked worth a hoot the spin balancer should show zero weights needed every time. Adding 2.0 to 2.25 ounces to balance a tire is not the insignificant amount that he indicates, it's a lot. Besides that, this guy is trying to road test his balance at much too low a speed, the balance would have to be off by a crazy amount to develop any trouble below 50 mph. The most aggravating part though, beyond his presentation, is that the test tire is actually coming apart! No vehicle should be running on a tire in that condition.
ReplyDeleteI have balanced THOUSANDS of tires both new and used, using both static and dynamic balancers and all sorts of weight types. If I found that I needed 2 ounces in any one spot I would rebreak the bead and rotate the tire on the rim between 30 and 60 degrees and try again. That process should be repeated until the balance is as close as possible without any compensation at all. At that point you finish the job with weights using the least possible amount.
Save your money and have your tires balanced by a professional using the correct exterior weights for your particular type of wheel.
I don't know about balance beads. The Tire Doctor (on YouTube) uses them. I posted the video because the guy stuck his GoPro inside the tire and recorded it. Never seen the like. Too cool.
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