[BigD63]

Hello all,
I am new to the forum and have a question.


My dad has been asking me what equivalent tire sizes are for his old Bias plys on his 55 F1, and I have no idea.


Is there a formula I can use, I am savvy with math and excel.


His original tires are 6.50R16LT, I assume that is 6.5 inches wide (165mm), but what is the aspect ratio? On a Bias, is the sidewall height a percentage of the tread width, or its own static height?


Can anybody help me out?


Thanks all!