Originally Posted by
JohnDThompson
Safe? Sure, but the brakes will probably grab whenever that dent passes the brake pads. Depending on the rim, that might be fixable. Your LBS might have a
tool like this that can squeeze it back into shape:
You can accomplish the same thing with a large channel pliers or a very large vise-grip. You have to be very careful to only apply the right amount of force no matter what tool you use.
If its an aluminum rim, check carefully for cracks or blemishes where the bend and re-bend occurred.