Also looking for rear rims. All I see in 6in are 3 on 2.5in with 1/4in studs.
My hubs are 3 x 56mm on 8mm studs, 8in wide.
That's an oddball bolt circle size.
I can see that your rear hubs also have a hub-centric lip protruding outward that would require the rims to have a larger than 40mm center hole.
If you want 6" X 8" rims, Douglas makes them to fit normal Metric racekart hubs with 40mm axles; but online racekart shops in the USA don't list them. They only list 5" diameter rims for this application, because racetracks in the USA require sprint karts like yours to run 5" diameter rims, not 6"...
The 6" diameter rims are typically only used on Oval racekarts in the USA, and they run 1-1/4" diameter axles, not metric sizes. But Superkarts in Europe use 6" diameter rims with 40mm & 50mm axles. Douglas makes 6"x 8" rims to fit those European racekarts with the 3 on 50mm. bolt circle, with a 40mm center hole, with 8mm stud holes they use. But Online racekart shops in the USA simply don't list those 6" diameter rims because hardly anyone here in the states buys them, you'll need to call/email your online racekart shop and special order them, and then you'll also need a pair of normal Metric rear hubs made to fit your 40mm. axle.
This diagram shows the 3 commonly used racekart bolt circle patterns. The dimensions of your old rear hubs are not listed, I could be wrong but I think they might be some oddball adaptor-hubs made for running 50mm axle rims on 40mm axles.
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