205/60 R15

205 205 . 60 % 205 x 60% = 123 . 2 246 . ( 2 )15 1 25.4 . 15 x 25.4 = 381 . 246+381 = 627

215/50 R16

215 x 50% = 107.5 2 215

16 x 25.4 = 406.4

215 + 406.4 = 621.4

215 - 45 -17 1. 215 * 45% = 972. ( 1.) 97 * 2 =1943. 194 / 10 ( . .) = 204. 20 / 2.54 ( . ) = 85. 8 + 17 () = 25" 25