A TIP FROM EMILIO: EMILIO'S FIRST LAW OF TRIATHLON
EMILIO’S FIRST LAW OF TRIATHLON: Never wear, use, or do anything in a race that you have not worn, used, or done repeatedly in training.
It is called training for a reason, you are not only physically and mentally preparing your body for the race, you are also preparing your bike, clothing, nutrition, and any other equipment, to perform as you expect. When the expectation is met, then on race day you are able to think about the race and not about the equipment.
Test everything in short training sessions first, then incrementally add more time and/or distance to each session using the same product(s). Remember to simulate the expected race conditions as much as possible.