Super Duty Fitment: This kit will only fit 2011, 2012, 2013, 2014, 2015, 2016 F250 4WD Powerstroke Diesel Super Duty models with standard 8-lug bolt patterns. This kit is not compatible with Dually models. The system allows for the fitment of up to 35x12.50" tires with at least a 17" wheel with 5" of backspace.