20pcs Presta Valve Core Set,Brass Bike Kit universal Cores for Road Bike, Mountain Bicycles FOROREH Replacement Set

【Easy installation】 As soon as the knurled nut is loosened and the valve pusher is pressed, the valve is open. When pumping, you only need to overcome the tyre pressure, which makes pumping easier. 【Good Application】 Sclaveranda valves due to the smaller diameter are mechanically slightly less than other valves. The threaded follower shank with a knurled nut (both brass components) can bend and break when lifting or weaning the pump. 【Universal】The higher the internal pressure, the stronger the press of the cone in the seat. This makes Sclaveranda valves suitable for high tyre pressure, which are needed e.g. in a racing bike to achieve a slight rolling resistance 【Difference 】 Presta valve is very similar to rain valve, which is mainly used in Italy. In the rain valve, the threaded stem is so short that it does not protrude from the valve pipe and therefore cannot be bent. 【Service】 In case of problems please contact us. We will be happy to help you within 24 hours.