Sigarms
Super Member
If the tire's pressures are low, or there is rust on the wheel rim where the tire bead seats when properly inflated the tires will leak air until flat. Since both went flat it would most likely be underinflation in both tires. Check bead area for rust before re-inflating. Best to use a gauge to ensure even, correct pressures, as the wrong psi will affect cut quality too.
I actually replaced one tube a couple of months ago, and found it low again, and this time the other tire as low as well. Fell over dead on the hard foam filled tires prices, added from what I've read bout the bumpier ride.
Just picked up a pair of Ecoflex filled tires for $47 each and they seem to be working great (to short of a time to tell I realize, just hated having to keep screwing around with those tubes/tires).