How to Fix a Buckled Wheel on a Mountain Bike Like a Pro
To fix a buckled wheel on a mountain bike, first remove the affected wheel from the bike frame. Next, use a spoke wrench to identify the affected spoke(s) that are causing the buckle, and turn them in the opposite direction to straighten the wheel. Tighten loose spokes and loosen tight ones as necessary until the wheel is straight. Check the trueness of the wheel by spinning it and looking for any wobbles. Once the wheel is straight, re-install it on the bike frame and test it for rideability.