Would you put that on a 16” original rim?
I know the question was intended for another member on the chat. Though, Doschewy is spot on in regards to bigger tires/lower RPMs. I have the 5.38 gears like you, they sucked with the factory tires. Once I put 33s on my factory rims it massively changed the look of Roxor, and lowered the RPMs drastically, especially when I drive on the highway going 65 mph for hours at a time. Just one small little price you must pay, and that is the turning radius; however, worth the cost in my opinion.
I want to experiment with 35s on my Roxor as I am more than halfway done with the first set of tires. I am unsure as to how much more of a piss-poor turning radius with 35s; however, getting a nicer rise off the ground is a bonus, and I know the RPMs will go down even more. Yes, 35s has more weight, though, from the harsh city conditions and long continuous hours of 2800-2900 RPMs in 5 gear & 20k road miles driven, I feel a Roxor should be able to handle those 35s and with minimal or even no extra wear & tear. Though to run 35s just an extra minor mod would be needed, I heard you must reduce your full lock on your steering wheel, I hope I am saying that right.
To run 33s or 35s your going to need to do a shackle lift, Wade from DF has them