View attachment 262657
Measure the OD yourself, Vision and/or Summit may have calculated the OD rather than measuring a mounted, inflated tire.
FYI: 145/70-6: 145 is section width in mm, 70 is aspect ratio in percentage, 6 is wheel diameter at bead
145mm x 70% = 101.5mm x 2 = 203mm = 7.99" + 6" = 13.99"