Im about to drop my fat bob with Burly Slammers and Progressive drop ins and I have a question about wheel and tire sizes. Im planning on getting 18" wheels to replace my 16" stockers and Im concerned I might run into clearance issues depending on the hight of the tire sidewalls. Im leaning towards a 200mm Avon in the rear. Do any of you know how I can be sure it will fit? As in what numbers would I need to compare or some math formula I can use? I hope this doesnt sound too cofusing. lol Any advice or info would be appreciated.