Fixing wobbly crank arms / Adjusting crank arms

It is dangerous to ride on a bike with loose crank arms so fixing wobbly crank arms is a very important thing to know!
Follow the tips and instructions in the video to learn how to properly adjust and fix your crank arms. Enjoy!

This is a helpful video made for clipflip.
If you also want to make money, do not hesitate to join us on or watch our other video tutorials on


Click here for the best online deals on bike accessories, electric bikes, kids bikes, mountain bikes, bicycle frames, and much more.

Category: General

21 Responses to “Fixing wobbly crank arms / Adjusting crank arms”

  1. my left crank. when i just tight it up its fine i go ride and like 10 meter of riding its wobbly again ­čÖü (sorry for my english! :p)´╗┐

  2. Thanks for the effort, but did you watch your video before you published it? I hope not else I can't understand why you try showing what we need to see but it's mainly in darkness!. Then you're playing with that spanner that few would have and it's difficult to see what it is. .. I'd prefer see an ordinary tool that most may have.
    I searched for problem I have with mine I keep tighten it but it keeps loosening again.´╗┐

  3. think´╗┐

  4. how do you fix this on a mountian bike that is rideable still but the crank is out like u prolly would thing all the bearings are done´╗┐

  5. help´╗┐

  6. my left crank arm is always getting wobbly even if i thighten it up´╗┐

  7. When I tighten mine they just loosen again where the sprocket it, help?´╗┐

  8. only hear audio whers the video???´╗┐

  9. I've noticed if I tighten it just to the point to where it's snug, it makes it so my bike wont pedal backwards freely.´╗┐

  10. Last time I did this my chain tightened un evenly… Help?´╗┐

  11. my crank screw requires a bigger allan key set´╗┐

  12. Can you adjust the actual location of the crank arms? I changed the bottom bracket or whatever its called. After taking the bike out, I notice that I cannot actually pedal. The crank arms are awkwardly placed. Its hard to pedal. ┬áThe crank arms are supposed to be at 12 and 6 oclock positions, I believe. INstead, my crank arms are at 12 oclock and 3pm positions. It's very strange. I hope this is an easy fix. I am currently fiddling with the crank arms. Kind of airing my frustrations. ugh.´╗┐

  13. I did this and they still get loose´╗┐

  14. Not only can fall on a hill but you damage your knees as the cartlidge is hitting like a hammer drill repedative motion of this nature on one of our main weight supporting joints is very bad for ergonomics and can cause serious damage too your knees. Hopefully people do not underestimate this.´╗┐

  15. BMX bikes are SO simple lol, try to do this on a Mountain bike and you will see that it involves a whole lot of procedures, way more than this simple tightening with a allen key procedure.´╗┐

  16. UPDATE: My local bike shop had to replace the crank and bottom bracket. They could not be fixed and they showed me why. The total bill came out to $400. I did some Internet searching about the cranks and bottom brackets and they do wear out roughly every 5 years or sooner if you do a lot of cycling. The shop told me never to spray lubricant on the seal that connects the crank to the frame. I did this to stop the squeaky noise I would get but that added to the deterioration of these items. It's expensive to replace these items but is part of cycling I guess.´╗┐

  17. I'm having this issue right now, luckily I noticed it after coming back from a long ride just as I was putting the bike away in the garage. Just a suggestion to the guy who made this video. Next time, film it outdoors in bright sunlight because I can't see anything it is so dark.´╗┐

  18. Cool´╗┐

  19. I get this aswell´╗┐

  20. i have the same problem

  21. dude on my bmx whenever i ride like around the block my cranks get really loose so i always have to carry a tool how can i fix this´╗┐