![The bolt in the middle of the left crank keeps coming loose. I tighten it back up, but a couple miles later it comes loose again. How should I fix this? : The bolt in the middle of the left crank keeps coming loose. I tighten it back up, but a couple miles later it comes loose again. How should I fix this? :](https://preview.redd.it/13s7l5j6qfd51.jpg?auto=webp&s=c6f3f54f6a022f1c8de2448b9c3917c17f515e94)
The bolt in the middle of the left crank keeps coming loose. I tighten it back up, but a couple miles later it comes loose again. How should I fix this? :
![Bike Repair Help: This bolt keeps coming loose every mile or so and the shop hasn't been very useful in fixing it. Is it a defective part? How can I solve the Bike Repair Help: This bolt keeps coming loose every mile or so and the shop hasn't been very useful in fixing it. Is it a defective part? How can I solve the](https://preview.redd.it/jo57ujqwlg311.jpg?auto=webp&s=adb79b5470e0c25c10004fe0d2deb65c4d2132ac)
Bike Repair Help: This bolt keeps coming loose every mile or so and the shop hasn't been very useful in fixing it. Is it a defective part? How can I solve the
![Noob bicyclist, my left pedal crank arm keeps coming loose every 7 or 8 miles. How can i fix? (Picture inside) : r/bicycling Noob bicyclist, my left pedal crank arm keeps coming loose every 7 or 8 miles. How can i fix? (Picture inside) : r/bicycling](https://external-preview.redd.it/w52_MUMZKrPk5uL98q3TYf0qt0o1Ij21a-SJXXaduHY.jpg?auto=webp&s=7198777683921a55dacfcbde84673bd8e30a3d65)