I am in the process of rebuilding my old 93' Giant iguana (rigid-geared) into a single-speed mixed-terrain cruiser. I put drop bars and road levers on it but am still using medium/big 26" tires and V-brakes. so it rides more or less like a cyclocross bike. I personally don't care for suspension bikes because they feel sluggish to me but then I am not jumping off steep drops or hopping over logs or boulders either. The most I will bei doing is fire roads, carriage trail, flat singletrack and of course hopping off curbs and embankments. (stuff I wouldn't want to do on my road bike.)