Could someone please help me, do the 23mm rims and tyres off the genises fit on the new matrix arena. if they do is it ok to use them on it.
Also is the filter and foam the same size.
Thanks

The filter and the foam are the same.

While you technically could mount the Genesis rims on a Matrix Arena, it's not a good idea. At least not with the stock gearing. Make sure you change to a shorter gear ratio. Also something that I'm not so sure of is whether you will have full steering throw (probably so, just not sure).

If you do try to mount the huge monster truck tires onto the truggy you run the risk of killing clutches. I have not tried it, but I would highly recommend against it. In my opinion Monster Truck tires belong on a MT not on a truggy.

And as blitz mentioned I am not sure if you would get enough steering. But you might, as the stock Nemesis and Genesis/GST rims all feature about a 1/2" offset, so this may be enough in theory to fit. Again, I would NOT recommend actually trying to run the TR Arena with the Monster Truck tires.