| 320, 14.9 or 380 Section Dual Rear Tire and Hub Extensions |
| Row Spacing - inch |
20 |
22 |
30 |
32 |
34 |
36 |
38 |
40 |
| Drive Wheel - inch |
80 |
88 |
60 |
64 |
68 |
72 |
76 |
80 |
| Dual Wheel - inch |
120 |
132 |
120 |
128 |
136 |
144 |
152 |
160 |
| Dual Extension (110.5-in. Axle) |
N/R |
N/A |
N/R |
5" |
10" |
10" |
15" |
N/A |
| Dual Extension (118.5-in. Axle) |
N/R |
N/R |
N/R |
N/R |
5" |
10" |
10" |
15" |
| 420, 18.4 or 480 Section Dual Rear Tire and Hub Extension |
| Row Spacing - inch |
20 |
22 |
30 |
32 |
34 |
36 |
38 |
40 |
| Drive Wheel - inch |
N/A |
N/A |
60 |
64 |
68 |
72 |
76 |
80 |
| Dual Wheel - inch |
N/A |
N/A |
120 |
128 |
136 |
144 |
152 |
160 |
| Dual Extension (110.5-in. Axle) |
N/A |
N/A |
N/R |
5" |
10" |
10" |
15" |
N/A |
| Dual Extension (118.5-in. Axle) |
N/A |
N/A |
N/R |
N/R |
5" |
10" |
10" |
15" |
| 520 or 20.8 Section Dual Rear Tire and Hub Extension |
| Row Spacing - inch |
20 |
22 |
30 |
32 |
34 |
36 |
38 |
40 |
| Drive Wheel - inch |
N/A |
N/A |
N/A |
64 |
68 |
72 |
76 |
80 |
| Dual Wheel - inch |
N/A |
N/A |
N/A |
128 |
136 |
144 |
152 |
160 |
| Dual Extension (110.5-in. Axle) |
N/A |
N/A |
N/A |
5" |
10" |
10" |
15" |
N/A |
| Dual Extension (118.5-in. Axle) |
N/A |
N/A |
N/A |
N/A |
5" |
10" |
10" |
15" |
| 620 or 710 Section Dual Rear Tire and Hub Extension |
| Row Spacing - inch |
20 |
22 |
30 |
32 |
34 |
36 |
38 |
40 |
| Drive Wheel - inch |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
80 |
| Dual Wheel - inch |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
160 |
| Dual Extension (110.5-in. Axle) |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
15" |
| Dual Extension (118.5-in. Axle) |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
13" |
| NR = Dual hub extension, not required for tread setting |