I also have a multi-use bike, and have a "road" setup with rack (fenders if necessary) and 50mm slicks, then I throw the 2.4 ardents on for trail duty. The rack is 4 hex bolts - literally a minute or two to install/remove. If your bike has the requisite mounting eyelets, it is easy as pie. If not, a seatpost/quick release rack might be an option.