the Park PCS-4-2 is designed to last and look great for years to come

Models are available in small and large sizes to suit different sized faces

SPRING ADJUST Air pressure via single Schrader valve

Bosch includes 2x4

Cons: You can't pop in a spare battery on the fly

Bikeyoke Barkeeper 31.8mm Reducer Sleeves Images Uploaded - Ready for Review the Park PCS-4-2 is designedThese reducers allow the use of handlebars with a 31. 8mm clamping diameter in our Barkeeper stem, which is normally designed for 35mm handlebars. Weight: 19g pairNote: These sleeves were specifically designed for the BikeYoke Barkeeper stem. Other stems were not checked for compatibility. Stem not included.