The Polaris RZR, a vehicle for recreational use, has been linked to scores of fires and four deaths. But its maker insists it is safe. John Hill sustained third-degree burns and spent weeks in a coma ...

In Ride Out with Ronnie Renner, his boys take their bikes and the Polaris RZR to new heights. While the 13-time X Games medalist might be best known for his competitive accomplishments, he's a living ...