TOPIC:

That's also done on the rear of the Top Force - it seems to be the "official" way for a ball diff in any case.
The TF front uses universals so there's no wheel axle then.

I think on the DF-01s I built so far there was always room to use rings on both sides of the dogbones.
It shouldn't be interfering with the free movement of the suspension arms though...

Into my ff01 I put a 24 teeth motor gear and 21 into my ta02s
it is funny and have good speed and autonomy