Hi yes I can see your point, But this is not a bike, its an electric moped, and there is a lot involved, 1st I have to get moped up 2 flights of stairs to my flat, as on 1st floor. then have to remove the seat, disconnect cable to motor, oh and box at back and wing mirrors, so I can tip moped upside down, remove brake cable chain wheel nuts etc etc. plus then remove motor from wheel. as its too heavy to carry to a bike repair shop or garage. But Yes you are right I dont intend pumping up tyre each time. But fingers crossed Im hoping it is the valve core, although I did put some soapy water around valve and no bubbles appeared. But I have ordered some spare valves so maybe mine is a very slow leak. will fit a new one when they arrive. if not well its back to flat to check it out. I am very mad as I have been fixing moped for 3 months. then because of 1st time back on road axle somehow twisted broke cable. so therefore again another month waiting for parts. back on the road again after 4 months now dam puncture. well hope its not, so can you see my frustation. But yes I dont intend to keep pumping up tyre each time.