Learn how to adjust the stem height on the headset of a mountain bike in this free online video on cycling maintenance.
One of the nice things about you thread less headset stem is that is allows you to fairly quickly play with how high your handlebars are. With our thread less stem we have the option of running it this way, or this way. As you can see those are very different angles. We can also play with how high they are on the steer tube of the bike by adding or subtracting spacers. I mean if I wanted the stem this high I could just put on a stack of spacers to achieve that. This, we have to remember we adjust these the same way; you have to adjust the headset every time you take off the stem. It's the stem that ultimately keeps the headset locked down and at the right tension. That?s the simple using your top cap and tightening things us so they are just tight enough so that you don't have that front to back play and you still have a really smooth overall rotation. You can see with a seven degree rise stem that I have here, it really makes a big difference in handle bar height whether you have it this side up, or if I flip it over and run it inverted. My handlebars are significantly lower. One of the real big advantages with having these thread less headsets and these steer tubes and these nice clamp on stems is that we can flip them over. With the older style threaded headsets it's easy to adjust the height because you have a coil here that you can slide up and down by loosening this, but if you want a big change, like if I wanted to flip this over obviously I can't flip it over because there is nothing holding it to the bike.