quick question: i have the rt-615 i got them last year and have 1 track day on them but were on the car every day. I store my car over the winter and i took the tires off and put on a whatever set for storage. the rt-615's were in my garage which is partially heated, never really get's below 50*. I am using the tires this year until they are beat, i was wondering if i can expect any drop in performance. I'm going to assume no, i will take extra time at my first HPDE to bring them up to temp.

 

As long as they are stored in a room temp area that doesn't have abnormal changes, you should be fine.

 

I would be more worried about the humidity than the temp
You should be fine for HPDE though - I know people still running the pre-RT615 Azenis tires from like 4-5 years ago.