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r/MTB
126k  subs
A cycling community enthusiastic about mountain biking and all things related.
https://reddit.com/r/MTB/
r/Bikeporn
51k  subs
A subreddit for the worlds most beautiful, eye-catching bikes. Road, Mountain, Track, Commuter, Fixed, Cyclocross or BMX, all are welcome.
https://reddit.com/r/Bikeporn/
r/bikewrench
46k  subs
A forum for folks with questions about bicycle repair
https://reddit.com/r/bikewrench/
r/bicycling
507k  subs
Two wheels, powered by a person. Interested in riding a bicycle? We welcome bicyclists of all skill levels including those who don't yet own a bike. Ask us your questions or meetup with other redditors in your area for local rides. Happy cycling!
https://reddit.com/r/bicycling/
r/snowboarding
468k  subs
All things snowboarding, /r/snowboarding or "shreddit" is the home for shredders of all age, cultures, and abilities. Whether you are looking for great video clips, gear recommendations, how to land your first 3 or maybe 9, or just want to hang out with some shredders, this is the place. Remember, somewhere in the world, it's snowing right now!
https://reddit.com/r/snowboarding/
r/skiing
445k  subs
The sport where you strap two boards to your feet and point them down the mountain. Turning optional but not recommended.
https://reddit.com/r/skiing/
r/gopro
93k  subs
A community of picture and film oriented users with the shared passion for developing and viewing content created with the GoPro camera systems.
https://reddit.com/r/gopro/
r/bmx
22k  subs
For discussion of Bicycle Motocross & showcasing grassroots beginners all the way up to the latest & most groundbreaking media BMX has to offer. It's easy, you do.
https://reddit.com/r/bmx/
r/29er
6k  subs
Anything and everything bicycles with twenty nine inch wheels.
https://reddit.com/r/29er/
A subreddit dedicated to the process of making mountain bike trails.
https://reddit.com/r/MTBTrailBuilding/
r/cycling
95k  subs
bikeit! bike bikes bicycle bicycles bicycling cycling
https://reddit.com/r/cycling/
r/subaru
140k  subs
Where OC is the standard and boxer engines rule the world.
https://reddit.com/r/subaru/
r/MTBVideos
3k  subs
Subreddit of /r/MTB, where you can post videos of all your Mountain Biking trails, downhill etc.
https://reddit.com/r/MTBVideos/
/r/FixedGearBicycle is a community dedicated to sharing content surrounding the world of fixed gear bicycles
https://reddit.com/r/FixedGearBicycle/
r/climbing
466k  subs
The home of Climbing on reddit. And yes we are scared of falling.
https://reddit.com/r/climbing/
r/AdrenalinePorn
198k  subs
High quality images of heart racing activities (not sex).
https://reddit.com/r/AdrenalinePorn/
Share everything about mountain biking: bikes, parts, pros, your favorite places to ride, etc.
https://reddit.com/r/mountainbikes/
r/cyclocross
14k  subs
For all things related to cyclocross - bikes, races, culture, mud, madness. The lot.
https://reddit.com/r/cyclocross/
r/4x4
54k  subs
*Everything that has to do with 4 wheel drive...*
https://reddit.com/r/4x4/
r/Velo
19k  subs
your place for competitive amateur racing (or competitively minded) discussion & information!
https://reddit.com/r/Velo/
r/fatbike
5k  subs
All things fat bike. Photos, events, videos, stories...
https://reddit.com/r/fatbike/
r/TopGear
210k  subs
The best subreddit... in the world
https://reddit.com/r/TopGear/
r/engineering
254k  subs
The hub for all content related to the engineering discipline.
https://reddit.com/r/engineering/