Review on Bike Fork Stem Extender - MTB Handlebar Riser Extension, Aluminum Alloy Head Up Adapter for Mountain Bike, Road Bike, MTB, BMX - Extended Edition (Brand New, Silver) by Antonio Gonzalez

This product has a number of design flaws which make it very unsafe. This is not safe as you cannot tighten it enough to keep the fork from rotating. More than 15 pounds of pressure and your bars and front wheel are out of alignment and at about 40 pounds you can rotate the bars without moving the wheel. the end is a circumferential angle touching the fork. While it looks better, it means one side has 4-5 threads to hold the bolt and the other has 2. If it were a better material than cheaper alloy, 2 would be enough when tightening, but it comes off easily solve. Also, because of this shape, it is not possible to use a lock nut behind an installed thread. Using an angle washer and locknut caused the bolt to bend since the angle washers are flat rather than arcuate. If you are looking to break your collarbone and wrist, this product is for you!