I've had internal balance in my tires for about three years now. Not dynabeads, some other brand I forgot which but the same idea, they are small plastic beads. I've got 255/85/16 Interco TrXus MTs (33x9). I have been extremely happy with them, I love the idea of them balancing the tire for the life of the tire, instead of having to re-balance every so often as the tire wears down. I can only imagine the balance issues I would have had with 6 reasonably heavy Interco tires over the years. I'll never use anything else from now on.
On a funny side note, I met a guy with a radical race truck, who asked me about balalncing and noise from my tires. He didn't believe they are quiet (computer designed tread), and he also questioned whether the plastic beads would wear away at the inside of the tire. This is funny because his truck is a dually with stock tires. He has a fairly stock 454 up front, and a reverse mounted alcohol Hemi in the back making 2200 horsepower. He used to build multi-engine pulling tractors so he figured he could build a multi-engine street legal truck for drag racing. I couldn't understand how he could avoid the Hemi eating the th400 and the 454. Last I heard it did eat the 454 and the tranny, so now he's putting a 4.3 v6 in it (????).
Anyway, I thought it was funny he was concerned about the inside of the tires, when he punishes the outside with over 2200 horsepower on load range E stock street tires. I daresay the tires will wear out on the outside before the internal balance beads make much of a dent on the inside.
