I have a old mountain bike (10 years old) and for most of it's life it's sat in the shed (being ridden lightly maybe once or twice a year), only recently have I tried riding it regularly for the first time since ownership.
I have a really strange problem with the bike tyre pressures, sometimes whilst it has been in the shed they have gone completely flat and just sat there like that for over a year. When I finally get round to riding it, I pump them up and they are good to go, however, sometimes after pumping them up they go completely flat the next day. Other times, when I pump them up they hold pressure for months on end (if not years) without going flat.
What I found really strange is yesterday I thought my front tyre pressure was slightly low so thought I'd pump both tyres up nice and high as I'm mostly using the bike on the road now. Pumped them both up, put the bike back in the shed. Today, I go for a bike ride and the back tyre is perfect, solid, the front one is completely out of air. So pumped it up again and went for a ride, half way on my journey it went completely flat again and so had to ride back on the flat.
Now I've taken apart the front tyre and pumped up just the inner tube, it's holding pressure fine for now, will do the water bucket test tomorrow, but there are currently no signs of leaks.
Does anyone have any idea why my front tyre can hold pressure for months on end and then after being pumped up it immediately goes flat very quickly sometimes (the back has done the same in the past).
Since I'm riding the bike more often, I really need to sort this as I am travelling further and further and it really sucks to come back on a flat.