This product has two lag bolts that must apply a clamping force around the steerer tube when tightened. The product is designed and assembled so that the upper clamp bolt cannot be tightened around the steerer tube. Instead, it tightens on itself, with the pressed-in extension second only to the bottom clamp bolt in providing a clamping force around the steerer tube. The design also has the top clamp bolt located near the top of the steerer tube edge, unlike traditional stems. This can result in this extension detaching from the top of the head tube during hard or emergency braking as the extension is heavily cantilevered. When using the supplied rings and a lag screw. Extremely dangerous!
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