NDT
there are dozens of ads for NDT tires in the supply line mag of the MVPA and just on the net in searches.
As for the previous grassland tread mentioned, a larger version of what appears to be identical tread is on our John Deere tractor at a local golf course. We tend to call the turf tires when ordering , but there are also many different tread styles. Perhaps searching for industrial turf tires or tractor turf tires at a local tire shop in Canada or the US may turn up something, I do know they have books on books of pics of tire treads....
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