My theory is that you are unlikely to get a proper balance at a typical tire store for in-service tires because the tires temporarily flat spot while the vehicle is parked waiting for service.
Tell me if this sound familiar:
You go offroad, maybe air down, and end up with tire vibrations on the way home (probably due to tire slippage on the rim).
Go to Discount Tire, they rebalance. Later you discover it still vibrates at high speeds (not as bad though but just annoying). So go back to Discount Tire, they rebalance and find it was off a little bit. Repeat, repeat.
Maybe you get some new tires. Wow, rides smooth as glass now. Must have needed new tires - amazing.
Tell me if this sound familiar:
You go offroad, maybe air down, and end up with tire vibrations on the way home (probably due to tire slippage on the rim).
Go to Discount Tire, they rebalance. Later you discover it still vibrates at high speeds (not as bad though but just annoying). So go back to Discount Tire, they rebalance and find it was off a little bit. Repeat, repeat.
Maybe you get some new tires. Wow, rides smooth as glass now. Must have needed new tires - amazing.
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