(hats off to Proclone here)
Okay, you need to name the treads TREADSL01 and TREADSR01, the material on each tread has to be named the same.
Go to the Vertex Material tab (in the material menu) under the Stage0 Mapping you need to add UPerSec=0.1 in the box underneath. Do this for both tread materials
Then you will need to export the model using the File-Export not the Export using standard materials that is commonly used.
You may need to adjust the mapping on the tread to get it look right, but that is another issue.
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