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Provides additional stem height of up to 121mm with stack spacers Clamp-On alloy Steerer Extender for 1.1/8" Ahead system forks. Height adjustable by 4 narrow and 1 wide spacer Base Diameter: 1 1/8" (28.6mm), Fork stem dia: 28.6mm (standard) How to use it: 1.Insert STEM-UP onto the fork stem and place height adjusters onto STEM-UP until your preferred height level for your stem. 2. Stem and wheel in the same direction and hignten clamping bolts of the stem Pakage include:1x STEM-UP kit (With Buy Allamazing logo Bag)