Did you use CO2 to fill your spare Vittoria Corsa Speed? If so it’s looses air faster then if you used a hand pump. Normal...I don’t know the Physics behind it but the tire is fine....I never used a Latex Tube Tubular as a spare when I was using them.

My best guess is something with the valve.

^^^^^ this.

CO2 leaks a lot through latex. I think the one time I tried this, it was ~10psi/hr. Maybe more. If that is the case OP, then just put air in and see if that holds.

yah i call this fantom tube leak I was getting them like once a year I don't know why i was gettign so unlucky and all my friends were just fine... now i use tubeless so i have other problems

^^ +1, same thing.

Zedzed,

One more thought to consider due to the stretchy nature of latex vs butyl. If it's a latex tube with a very small hole, the tube often won't show a leak with a normal water test at the limited pressure you can pump an unbridled tube up to without it looking like anaconda that swallowed a small antelope. They also will hold air for days at very low pressure if you didn't reinsert it back into the tire and pump it up to high pressure it will sit by itself inflated and not leak down.

Hugh

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Genetics load the gun, lifestyle pulls the trigger.

Despite the flat-how did the rest of the day go for you? I loved the new swim (I did 70.3), did you find it congested on the second swim lap?? Hope the race otherwise went well. Looks like Busso will be back on the map for many after a great event this year.