I actually don't think they were available on the 400. they would have been on the next size larger tractor, like the 600,650 or even the super wd9. I think it was just too much tire for those smaller tractors.
 
Could talk to his son Scott too. They are both usually at the dealership and are very knowledgeable and good about finding hard to find parts.

A.P. Equipment in Valley City, ND
 
you are correct, my 450 has 18.4x 30 and the 400 has the same as w6, 16.9x30. the 450 also has the newer style rim with bolts like the 560 has,instead of the clamps.
 

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