PRESS THE BLOODY BUTTON ON THE PUMP HOSE BEFORE UNDOING IT!
(if you don't have the hose with the button ask Lezyne nicely for one :)
That button lets air out. The valve core still unscrews.
@Ramsaye started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
PRESS THE BLOODY BUTTON ON THE PUMP HOSE BEFORE UNDOING IT!
(if you don't have the hose with the button ask Lezyne nicely for one :)