Strangest thing, yes the rear tire on my bike is about 5 years old but it hasn't been ridden much (long story) and it is stored off of the ground on a bike jack when not being ridden. No visible dry rotting or cracks in the side wall.

I have Ride-On MC Sealant in the tires, replaced the valve core (checked for bubbling afterwards, no) and checked all surfaces of the tire for any punctures, tears, holes, foreign objects, etc with nothing visible.

Tire goes from 40psi to 13psi within a few days. I sprayed soapy water on the tire & sidewall surfaces and no bubbling was seen.

I would hate to pull the tire off but I guess I have no choice unless someone has something else I should be looking for.

My wife says it's from non-use.....Maybe????

 

if you're losing that much air in that short of time, I would pull the tire and really give it a look see.... there's got to be either something in the tread, leaking bead or valve stem. Those are the only three areas that will cause problems. Well there could be a porous wheel. Regardless I would pull the wheel and find a water tank large enough you can place part of the wheel/tire assembly in. Over inflate and look for bubbles....

and let us know what you find!!

 

Your tire is 5 yrs old replace it

 

yup, all that. i had one that would lose air over a couple days, it was the valve stem.

 

As mentioned before, just replace it, and the front too. New set of rubber to start off the season.

 

No bubbling from around the stem to wheel or from the valve core which I replaced......

Checked all grooves and surfaces with a high powered light.......

It would have to be a large void since the Ride-On Sealant seals small voids.....nothing is visible.....

I filled the tire up to 40psi again today, if it loses air again in a few days, I'll pull it off.....

 

 

Honestly, a five-year old tire regardless of usage really needs replacing.