I'm personally not familiar with that particular RC
Possibly someone else is and may have more knowledge with it.
I would have to see a picture of it's stub axle design (axle shaft fitted inside the wheel)
and the back side of the original wheel to even make an assumption.
If the original wheels have a 6 sided inset then I might guess it uses a 12mm hex hub,
of which fits into the backside hex indent of the wheel.
The outer nut then tightens down on the axle's stub threading holding the wheel secure.
Measuring that to see if it is for fact a 12 mm hex could be of help.
There are different designs of 12mm hex's that might work for you.
But you would need measure that stub axle diameter to know what the wheel's hole diameter needs be.
If it is a copy of other 1/16 scale kits out there...
It may be able to utilize some of those parts.
But I don't know that to be of fact...
So giving you my advice or opinion could be a disservice.
The 1/10 scale Axial crawler cars utilize 12 mm hexes on the stub axles.
But some utilize smaller center bore holes and some larger.
Some look like this with a smaller bore and protrusion...
and some have larger bore holes with no protrusion...
So you'll need supply some custom pictures showing exactly what you have.
And will require partial dismantling to capture those visuals.
Possibly someone else has one of these and can share their experience of ownership.
But without pictures detailing... I couldn't even attempt to guess.
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Did you even attempt to mount the new wheels to the hubs ?
It's possible the center bore hole might not be too critical,
as the wheel would be tightened against the hex's surface(s)
and cause the outer wheel hub center bore to align good enough when the nut is tightened.
The wheel hex usually resides on a cross pin drilled into that axle's outer ends.
Tho' maybe the step above being a dept. store toy...
My cheapo chinese mfgr'd (but rebuildable) Red Cat Everest16 utilizes cheap plastic hex hub(s) index pressed onto the axle's cross pin(s)
I could probably fit common 12mm alloy clamping hex hubs in their stead, and those generally would fit better, run truer and be more durable.