How to Adjust Your Mountain Bike Headset Like a Pro
To adjust a mountain bike headset, first, loosen the stem bolts on the handlebars and remove the cap on top of the headset. Use a headset wrench to loosen the locknut and turn the top race counterclockwise to loosen or clockwise to tighten the headset. Re-align the stem and re-tighten the bolts to secure the headset in place. Finally, replace the cap and adjust the tension as needed.