All 20" wheels are NOT the RH-5 Widow Makers.
Wheels that have the locking ring out at the edge of the wheel near the bead are safe.
The RH-5 Wheels are made to come apart in the middle of the wheel. They can be identified by the 2" wide raised band on the rim right where the center disc meets the rim.
Check out Grigg's technical article on wheels for more info.
Mike B
