Celebrity Bikers

Talk show host David Letterman takes a spin on Paul Teutul Jr. & Sr.s new mass production motorcycle, the OCC Splitback outside the Ed Sullivan Theater during a taping of The Late Show with David Letterman in New York, Wednesday, July 26, 2006. The Teutuls, the stars of the hit reality show American Chopper, debuted this new mass production bike on the show.

Pittsburgh Steelers coach Bill Cowher, right, talks with quarterback Ben Roethlisberger during a second quarter time out against the New England Patriots Sunday, Sept. 25, 2005, in Pittsburgh, Pa. Roethlisberger, who has said he dislikes wearing a motorcycle helmet, was seriously injured in a motorcycle crash in Pittsburgh. In May 2005, Cowher lectured Roethlisberger on the dangers of riding without a helmet.

Tom Cruise, star of the new film "War of the Worlds," and fiancee Katie Holmes ride down the red carpet on a motorcycle as they arrive for a screening of the film Monday, June 27, 2005, in Los Angeles. (AP Photo/Kevork Djansezian

Country musician Keith Urban attends the third annual Academy of Country Music celebrity motorcycle ride held at Las Vegas Harley-Davison on May 21, 2006 in Las Vegas, Nevada. The motorcycle trip through the Nevada desert benefits the Academy of Country Music Charitable Foundation.

Actor Dennis Hopper waves from a Harley Davidson motorcycle at the Expo 2000 World's Fair in Hanover, Germany on Thursday, June 22, 2000. Hopper, who starred in the cult motorcycle flick "Easy Rider" earlier in his career, was promoting his new film "Saint Cry."

Actor Peter Fonda rides his motorcycle at the Love Ride 20 at Harley-Davidson/Buell of Glendale on Nov. 9, 2003, in Glendale, Calif. The annual motorcycle cruise and concert hosted by Grand Marshal Jay Leno benefits the Muscular Dystrophy Association, Reading by 9 and other charities.

Comedian Jay Leno poses on his motorcycle backstage at the Love Ride 20 at Harley-Davidson/Buell of Glendale Nov. 9, 2003, in Glendale, Calif. Leno served as Grand Marshal of the event. Leno owns more than 40 motorcycles and 30 classic cars.

Actress and model Lauren Hutton, center, was injured in an Oct. 21, 2000, motorcycle accident. She was riding with actors Dennis Hopper, right, and Jeremy Irons at the time. Hutton suffered multiple leg fractures and cuts and bruises. Hopper insisted that she wear motorbike leathers, and Irons gave her a full-face helmet just minutes before her crash.

Actor Gary Busey and Cody the chimpanzee attend the premiere of "Moto X Kids," Jan. 29, 2004, in Universal City, Calif. Busey nearly died of head injuries in a motorcycle accident in December 1988. Busey, who was not wearing a helmet, had just picked up his bike from being repaired when he slid on a patch of gravel at 40 mph, flipped over the handlebars, and hit his unprotected head on a curb.

Princess Stephanie of Monaco straps on a motorcycle helmet Dec. 13, 2003.

Actor Ewan McGregor, left, and his long-time friend Charley Boorman pose for the media in London, Tuesday, April 13, 2004, ahead of their three-month round-the-world bike ride, in which they will ride a motorcycle from London to New York. The ride will be filmed and made into a TV documentary for U.S. and British networks.

Brad Pitt and Angelina Jolie address a press conference held for the Namibian press exclusively in a hotel in the Namibian city of Swakopmund June 7, 2006, following the birth of their daughter, Shiloh. Papa Pitt rides a motorcycle. Jolie rode one in "Lara Croft: Tomb Raider."

Rosie O'Donnell arrives at the Gladstone Center for girls in Miami, Wednesday, July 26, 2000, on a motorcycle during a presentation of a $1 million donation from Office Depot to the CHARLEE Program, a south Florida charitable organization that cares for children who have been abused or neglected.

Politicians, Too

During his run for the presidency, Massachusetts Sen. John Kerry rides a motorcycle onto the stage of "Tonight Show with Jay Leno" in Burbank, Calif., Nov. 11, 2003.

California Gov. Arnold Schwarzenegger displays an injured lip at a press conference Monday, Jan. 9, 2006, in the North Hollywood section of Los Angeles. Recalling his days as a Hollywood action hero, the governor said the weekend accident that caused the injury won't stop him from riding motorcycles.

Indiana Gov. Mitch Daniels heads down a street on his motorcycle following a visit to the Studebaker National Museum, Friday, June 9, 2006, in South Bend, Ind. Daniels was on a two-day trip to promote a combination of motorcycle safety, awareness and riding opportunities in Indiana.