If you have outgrown your bars a little bit or are just looking for a little extra height, the District Volcano spacer will give you 17mm of extra height. That’s a litte more than a half inch of extra height. If you are going to use the Volcano spacer, you need to verify that you have at least 1.25 inches of fork steerer tube for your bars to clamp on to. If you have less than 1.25 inches of fork steerer tube showing, you run the risk of damaging parts or injury.