Seems the Rover can hold a 2 inch wide tire on OEM rims, according to TerraTrike's technical Support Team.
Road wise am okay with Marathon Plus all the way around, although going off paved roads/sidewalks the rear tire slips a lot. Have been strongly considering changing the rear tire to something with more shock absorption - which, unfortunately, also means being more susceptible to goat heads. Prefer to stick with OEM rims for now (cost issues).
Have been looking for a tread design that is road friendly like the older Specialized Croassroads, yet have a bit more bite & grip when treading across grass, rural ground, hard pack, gravel, and the sort. Alas, would also like the protection from goatheads that run rampant around this area.
Wonder if there is a happy medium?