KINGBULL Adjustable Bike Stem

Works but has issue.

This stem works and raises my handlebars to a nice height, but after a ride, it becomes wiggly. Tightening the set screw works a few times, but eventually, it stops holding. I take it apart and rotate the toothed bracket a few teeth, and it becomes tight again for a single ride. I am an industrial designer, and I suspect that if the teeth were tapered at a steeper angle both down the cylinder and down the width of the tooth, the engagement would be greater and they would not wear as fast. It is possible that I put too much side load on my handlebars. When I am really pushing, I tend to pull up on my bar as I push with my foot on the pedal to generate more torque. These bikes are heavy, so it takes a good amount of force to pedal them, especially in gears 5 through 7. I suspect that if you used the bike like an electric scooter, you would never have an issue with it, but I like to put in the torque.

Great for adjusting riding position angle!

The Kingbull adjustable bike stem allows me to easily adjust my riding position from lean forward to upright! This allows me to select the most efficient and comfortable position for various types of rides. Great design and quality product!

Bike Stem game changer

I am 5'2", so this was a great addition to my riding comfort. The adjustment of raising the handlebars so I can sit more upright was worth every penny.