600-6 6 ply high performance retread.
Their premium retreads are produced by their affiliate: Aero Wheel & Brake Service Corp. Aero WBS holds FAA certification to retread high speed aircraft tires up to 225 MPH.
Their sizes range from small piston engine aircraft through Regional Jet aircraft. 95% of the worlds airlines depend on retreads not only for cost control, but for the extended life they provide over most new tires.
Aero has the most advanced Laser Shearography tire testing facility in the USA for its Retreads.
15 = diameter of tire
600 = width of tire
6 = diameter of rim
The 15-600-6 is a smaller diameter tire than the 600-6. That is the biggest difference.