I will be brief here, but will any of those links provide me with a complete list of all such tradition, or is verbal tradition nebulous?
In any case, being the steward of revelation, which the Jews were explicitly affirmed to be, (Rm. 3:2; 9:4) does not make such the assuredly infallibly interpreters of it, which the Jews were not, much less Rome, regardless of her self-proclamation to be so. And by what means are we to ascertain that the claims of Rome are assuredly true?
Do you believe the Gospels?
Much of the Holy Tradition came from the apostles. So if one believes the Gospels and St. Paul, then one automatically believes in Holy Tradition.
In fact the Gospel of John says that not everything is written down. Also one of his letters states a similar line.
So if you believe in the Bible then you have to believe in Holy Tradition too because John and others tell us that not everything was written down.