2wd buggy rear tyres too wide?

[vrooom]

I got couple of worn tyres that is schumacher yellow minipin with hard insert. they are all worn in middle of tyre. with lot of thread in on outside edges of tyre. To me that is bit wasteful. tyres should be worn evenly across the width of tyre.

i am thinking tyre are bit too wide, maybe i should be using schumacher front minipin yellow tyres for rear if i trim the rear rim to correct size.

then it will be even wear across the tyre.

What you think about tyres are too wide?