Application Chart
Off The Road (OTR)
Undertread Bias Repair Units


HOW TO USE THIS CHART. In order to select the appropriate repair unit, determine the size of the injury in the tire by measuring the largest cord area removed after skiving and buffing. Using this injury size, refer to the left columns in inches or millimeters. Locate the tire’s ply rating along the top of the chart. The correct repair unit corresponds to the intersection of the injury size and ply rating. For example, for a four inch injury on a tire with a ply rating of 18, the correct repair unit would be an SFTU1712.
 
Injury Size                                                                     Ply Rating
Inch     mm 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36+

1/4"

6

 6-4 6-4 6-4 6-4 6-4 8-4 8-4 8-4 10-6 10-6 10-6 10-6 12-8 12-8 12-8 12-8 14-10 14-10

1/2"

12

 6-4 6-4 6-4 6-4 8-4 8-4 8-4 10-6 10-6 10-6 12-8 12-8 12-8 14-10 14-10 14-10 14-10 14-10

3/4"

20

 6-4 6-4 6-4 8-4 8-4 8-4 10-6 10-6 10-6 12-8 12-8 14-10 14-10 14-10 14-10 14-10 17-12 17-12

1"

25

 6-4 6-4 8-4 8-4 8-4 10-6 10-6 10-6 12-8 12-8 14-10 14-10 14-10 14-10 14-10 17-12 17-12 17-12

1 1/2"

38

 8-4 8-4 8-4 8-4 10-6 10-6 10-6 12-8 12-8 12-8 14-10 14-10 14-10 14-10 17-12 17-12 17-12 17-12

2"

50

 8-4 8-4 8-4 10-6 10-6 10-6 12-8 12-8 12-8 14-10 14-10 14-10 14-10 17-12 17-12 17-12 17-12 17-12

2 1/2"

65

   8-4 10-6 10-6 10-6 12-8 12-8 12-8 14-10 14-10 14-10 17-12 17-12 17-12 17-12 17-12 23-14 23-14

3"

75

     10-6 10-6 12-8 12-8 12-8 14-10 14-10 14-10 17-12 17-12 17-12 17-12 23-14 23-14 23-14 23-14

3 1/2"

90

         12-8 12-8 14-10 14-10 14-10 17-12 17-12 17-12 17-12 17-12 23-14 23-14 23-14 23-14

4"

100

             14-10 14-10 17-12 17-12 17-12 17-12 23-14 23-14 23-14 23-14 23-14 23-14

5"

125

                 17-12 17-12 17-12 17-12 23-14 23-14 23-14 23-14 23-14 23-14
 
 
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