So I have my track bike up and running, I want to test and tune some things in on it and get used to it. The rubber that is currently on it are pilots from 4 or 5 years ago, when the bike was last running. that sat on the bike in a garage, unused for the last few years. Theres no cracks or rot on them, and they dont feel hard. Are they wasted from sitting so long, or is it likely that I might be able to get a few practice laps on them? Im pretty much inclined not to risk it, but dont know if Im being too cautious.

Thanks