This is the OEM stem for Aventon ebikes. The Aventon Stem is not one-size-fits-all; Please be sure to choose the correct Aventon ebike model from the dropdown before adding to cart. Compatibility - We carry an adjustable stem. All other stem models purchased are the OEM replacement stem; They are non-adjustable. - Pace 350 stem is not compatible with Next-Gen Pace 350 models. - Adjustable stem is compatible with Pace 500.2 and Pace 500.3 ebike models