13.5mm Stem Riser Bike Stem, Aluminum Alloy Handlebar Stem Riser Fork Extender Bicycle Riser for Road Bike BMX Color Style and Size: Black, 13.5 x 3.5cm. Adjustable Height: The bicycle fork bar extender is equipped with a 5 x 10mm joint to increase the height of the bar 50-100mm. You can adjust the joints to fit your own height. High-quality Material: The bicycle handlebar riser is made of high-strength aluminum alloy, and the workmanship is rigorous and exquisite. The frosted process makes the surface more textured. Compatible with Most Bikes: The bike handlebar extensions are compatible with most bikes without 1-1/8" (28.6mm) steerer such as road bikes, mountain bikes, , BMX, etc. Easy to install: Loosen the handle with a hex wrench, insert the riser stem and tighten the screws and you're done. Even cycling beginners can use it easily. RIDING COMFORT: The bike head-up adapter is more flexible, lighter and easier to tighten when climbing. Comfortable and convenient operation. Make your riding more comfortable. describe: - You can fully adjust the new stem height according to your riding needs. - Use the stem adapter to get the ideal position. Improve pain and the pressure when bending forward. - Aluminum alloy with good mechanical properties, corrosion resistance and durability. - The handlebar is fixed with double screws, which makes the handlebar firmer and not easy to fall off, and it is more reliable to use. Applicable: standard diameter 28.6mm, most mountain bikes/road bikes Features: height adjustable, fixed with stainless steel double screws, not easy to loosen