Why does one of tyres keep goin down?

[Benjammo]

This maybe an obvious question, but the osf tyres keeps going down, it varies but takes a week or so to go down.
This morning I've taken the wheel off and checks the pressure, 30psi so it's lost a little but I put it in the bath and held it under the water and there is no air leaking anywhere, valve, bead and rubber is all sound.

Any ideas?

 

[Sweex]

Are you sure the tyre is sealed onto the bead ok? Sometimes the bead can get corroded and it wont seal properly. Take it to a garage and get them to take the tyre off, clean the beads up and put some 'orange sealant' on it, then put the tyre back on.
Sorted out the leaking problems i had on my alloys.
That or you have a tiny nail in the tread somewhere.

 

[Ziggy122]

Leaks can be slow and small

Have the tyre shop to break the bead abd remove tyre and give the inside of the rim a quick wire wheel or wire brush
A quick wipe down with a damp wrag on tyre
Buttered up with soap it should slop on and cure it

Remember if ur having it off make sure they revalve it and balance it
Dont let them get away with its a rear tyre it dont need it
Yes it bloody does

Ziggy

 

[dave]

check valve for leak before spending out at tyre shop, put a bit of spit on it if it bubles valve is leaking.

 

[Ziggy122]

check valve for leak before spending out at tyre shop, put a bit of spit on it if it bubles valve is leaking.

Can do same with a black bag - might make it easier to see bubbles

Ziggy