Advanced Motorcycle kits feature 4' of wire per strip. Classic kits feature 5' of wire per strip. These wires would go from the LED strip, to a central harness usually hidden under the seat. The best way to tell whether you would need extensions or not would be to mock where you would be placing the strips, take into consideration that you will be running the wires to a central location away from extreme heat and moving parts. Taking measurements is the best way to decipher whether or not you need extensions.