Quote Originally Posted by ny biker View Post
If you're not going to be switching back and forth frequently, I would just get slicks for the wheels you have. Extra tires take up less room than wheels in addition to costing less.

Depending on the type of off-road riding you plan to do, "light trail" tires might work for pavement as well as off-road. I currently have them on my mountain bike. They work on easy (non-technical) single track and are still decent for pavement.
Do you know the make/model of the tires you have, ny biker? Thanks! That might be the simplest solution of all since I never plan to do anything too technical. Fell too much when I tried that a few years ago, and it just wasn't that much fun. I like packed gravel, packed limestone, and easy single-track. Nothing too rooty or rocky.