Tender For bid to ras corrigendum : supply of motor vehicle tyres d d - tyre size 1000 x 20 ply rating 18 , tyre size 750 x 16 ply rating 12 , tyre size 215 75 r15 ply rating 8 , tyre size 235 65 r17 ply rating 8 , tyre size 245 65 r17 107h ply rating 8 , tyre size 255 60 r18 ply rating 8 , tyre size f 78 x 15 ply rating 8