i2 or x2?

[jimmiem]

I bought my first Segway in October, a used x2. It's in very nice shape but I like shiny new things. I got such a good deal on it that I think I can make a profit when I sell it.

I put on some aftermarket tires that are larger than stock and now when I glide with the stock tires I feel bogged down, like I can get enough speed. I would also like a set of i2 wheels for indoor use, but since they are smaller than the x2 tires I don't know if I can live with the reduction in speed. No, I don't need the speed for indoor use but it wouldn't be used exclusively indoors.

I've never ridden an i2 but from what I gather they are less forgiving on bumpy terrain.

I ride offroad a lot. If I get an i2 and convert it to an x2 will it be frustrating to ride offroad? Or should I stick with an x2 and just live with the speed reduction when riding the i2 wheels? Is there another tire/wheel option that would be practical for indoor use but be larger than the stock i2 wheels?