Instructions

How to Determine if a Stem is Defective:

Defective stems have an extension with a wall thickness of less than 2.5mm. It is relatively easy to determine whether a stem is defective by measuring the internal and external diameters of the extension tube:

Using a 6mm Allen key, remove the two faceplate bolts, faceplate, and handlebar. Using a caliper or similar precision measuring device, measure the inside diameter of the stem extension tube at the hole inside the handlebar clamp opening (see figure 1), which is revealed by removing the handlebar clamp and handlebar. Measure the inside diameter along the horizontal plane (side to side). Record measurement. figure 1 Using a caliper or similar precision measuring device, measure the outside diameter of the extension tube in a vertical plane (top to bottom) along the straight, constant outside diameter portion in the middle of the extension tube (see figure 2). Record measurement. figure 2 Subtract the measurement recorded in Step 2 from the measurement recorded in Step 3. Divide the result by 2. The result is the thickness of the extension tube wall. If result of step 4 is less than 2.5mm (0.0984 inches) then the stem falls within the scope of the recall and should be returned to QBP for a replacement. If you are in doubt about the measurement, return the stem to QBP. Click here to download printable PDF

Stems with a thickness of 2.5mm or greater are not defective, are safe for consumers to use, and do not need to be returned to QBP. If a consumer insists that they would like a replacement stem, QBP will accept their old stem and replace it. If you have any questions about the measurement procedure, please call (877) 725-7211 for assistance.

 

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