That's crazy. I just went out and checked our tires. On my car, I have 0107 on three tires, and 5306 on one. So does that mean there is 53 weeks in a year, or can I assume that it is another way of saying 0107?
I checked the bikes, too. My bike has a matching set of 3707, but Lori's Ultra Classic has 3505/0407 front/rear.
We will definitely be changing her tires out in the near future anyway, but that is eye opening. Damn HD dealers!