I think Avon or something makes them TRX's too, but why would you want to buy TRX ?
Swapping to 16" ponies make the car drive sooooo much smoother.
Those TRX tires aren't really that great.
My car would slide all over the road with trx, when I bouht some ponies and 235 tires, dear god, it's like I have new car !
If you look at it for a long period, eventually, swapping to ponies will be cheaper.