Patrick Dempsey1 of 25
Best known for his role as "McDreamy" on Grey's Anatomy, Dempsey is an avid cyclist who has befriended some of the top-level pros in the sport. He also started the Dempsey Challenge—a cycling event that raises funds for the Patrick Dempsey Center.
Matthew McConaughey2 of 25
This A-list celebrity and native Texan has been seen on several high-end long training rides with fellow Texan, Lance Armstrong. There's no surprise he's one of the fittest celebrities on this list. Alright, alright, alright!
George W. Bush3 of 25
The former U.S. president can be seen riding his mountain bike around his Texas ranch. He recently celebrated his 70th birthday by hosting a 100k mountain bike ride for wounded veterans.
Jennifer Aniston4 of 25
This Friends superstar and Hollywood A-lister was a bike messenger in NYC before making it big as an actress. While not competitive, she still rides and has been seen cruising the beach and film sets on her bike.
Robin Williams5 of 25
The late comedian was well known in the cycling scene for being a true fan and ambassador of the sport. Not only did he commute by bike to his film sets, but Williams was a huge fan of professional cycling and could be seen hanging out with the U.S. Postal Service team at the Tour de France. A portion of his extensive bike collection was recently auctioned off to benefit the Challenged Athletes Foundation, a charity supporting disabled athletes.
Bill Walton6 of 25
Standing at 6 feet, 11 inches, NBA Hall of Famer Bill Walton's passion for cycling dates back to his playing days at UCLA. Post-NBA, Walton continues to train for and complete century rides on a custom bike that measures in at an impressive 72.4 centimeters. You can even catch him still joining group rides throughout Southern California.
Bono7 of 25
The philanthropic front man for the ultra-successful band U2, Bono is an outspoken proponent of two-wheeled transportation and environmental issues. Unfortunately, he suffered serious injuries after a NYC bike crash in 2014 but is recovered and currently touring again.
LeBron James8 of 25
Three-time NBA Finals MVP LeBron James has been known to ride his bike to games, not to help reduce his carbon footprint or save a little money on gas, but to "stay in shape." Yes, you read that right. LeBron James, the basketball star some think is the greatest ever, is just like us.
Tony Kanaan9 of 25
Kanaan, the 2013 Indianapolis 500 winner, is just as passionate about bikes as he is about race cars. He designed a custom saddle to commemorate his 300th IndyCar start, with proceeds going to the Police Unity Tour, an annual 250-mile bike ride to Washington D.C., which supports fallen law enforcement officers. He's also a multi-time IRONMAN 70.3 Miami finisher.
Brett Favre10 of 25
A Super Bowl Champion and longtime Green Bay Packer, Brett Favre has transitioned from a life on the football field to one on two wheels. After retiring from the NFL in 2010, Favre kept up his endurance on the bike, training for and recently completing the Trek 100, a 100-mile bike race at the beginning of June.
America Ferrera11 of 25
This Ugly Betty and Superstore star has taken up cycling and triathlon as a way to better her body image and overall health. Recently gracing the cover of Triathlete Magazine, she speaks on using sport to improve your self-esteem for a more positive outlook on life.
Bo Jackson12 of 25
You might know Jackson as the former Auburn Tiger who won the Heisman Trophy and went on to play for the Los Angeles Raiders. Or maybe you know him as the former MLB All-Star who was a home run-hitting machine. But did you know he's also a cyclist? Every spring, Jackson leads a group of cyclists—which includes the likes of Ken Griffey Jr. and Picabo Street—in a charity bike ride called "Bo Bikes Bama," with proceeds applied to the construction of community tornado shelters across the state.
Reggie Miller13 of 25
An NBA Hall of Famer and former Indiana Pacers star, Miller is also an avid mountain biker. The 6-foot-7-inch Miller regularly takes his custom MOOTS mountain bike out on the singletrack of Malibu, Calif. Despite his height, Miller prefers climbing over descending—likely channeling the same ambition that led him to being one of the premiere shooters in the league.
Jimmie Johnson14 of 25
There has been a growing recreational cycling trend in the NASCAR community for the past few years, but none has been more involved than Jimmie Johnson. He has completed several century rides and has even been seen training with various pros.
Emmitt Smith15 of 25
This three-time Super Bowl Champion isn't just an everyday bike rider. The former Dallas Cowboy holds a Gran Fondo each year, which includes 100-mile, 100K, 45-mile and 22-mile races for everyone from the pro cyclist to the weekend rider. You may even see him out there on the course alongside you.
Jake Gyllenhaal16 of 25
This popular movie star (Brokeback Mountain, Donnie Darko) is a self-proclaimed fitness addict, an obsession that includes cycling. Frequently photographed on his bike, Gyllenhaal even took a reporter on a bike ride for a feature story.
David Byrne17 of 25
The former lead singer of Talking Heads and Rock 'n Roll Hall of Famer David Byrne penned Bicycle Diaries in 2009 and has used a bike as his primary form of transportation for years. He even designed art-like bike racks that were installed around New York City.
Matt Damon18 of 25
Damon is more than your average celebrity cyclist, completing the 68-mile Cape Argus Cycle Tour in South Africa on a tandem bike with his brother and avid cyclist, Kyle Damon. But it doesn't stop there. Damon was also selected to portray Lance Armstrong in an adaption of the pro cyclist's biography It's Not About the Bike.
Mark-Paul Gosselaar19 of 25
Best known for playing Zack Morris on Saved by the Bell, Gosselaar doubles as a competitive cyclist. And he's not too shabby either—moving up from Category 5 to Category 2 in just two seasons. He once went to France to watch Paris-Roubaix, riding part of the course a few days prior.
George Clooney20 of 25
This A-list actor not only shares a love for cycling with the likes of Lance Armstrong but also owns a house at Lake Como where the pro cyclist once trained for the Tour de France. Clooney can be seen hitting the trails on his mountain bike or even riding alongside Bono on the Irish countryside.
Pink21 of 25
This three-time Grammy Award winner rides her appropriately-colored bike for everything from doing errands to leisurely trips with her family. The singer, who is a PETA supporter and against the notion of horse-drawn carriages, makes a point of riding her bike rather than taking other forms of transportation.
John Kerry22 of 25
The former Secretary of State accompanied Johnathan Vaughters, manager of the Cannondale Professional Cycling Team, for a ride in Colorado with Vaughters noting that Kerry possessed enough talent to be one of the top riders in his racing category.
Sheryl Crow23 of 25
The nine-time Grammy Award winner is no slacker when it comes to riding her bike. Crow managed to climb Alpe d'Huez in 1 hour, 37 minutes. If that doesn't convince you of her cycling prowess, she was even once engaged to Lance Armstrong.
Neil Peart24 of 25
The drummer and lyricist for the band Rush, Peart has ridden across Cameroon, among many other western African countries. Later, he even wrote about his experiences in the book The Masked Rider.