After reading enough posts where guys are putting or have put bigger tires on the stock 6 X 19.5 wheels, I thought I should mention that after discussing this with a number of experts in the field, exceeding 22570R19.5s or 8R19.5s is NOT RECOMMENDED and is not DOT APPROVED. One can do what they want and swear there is no problem but like myself, they are truly not engineers that truly know what is safe and prudent. When it comes to suspension, brakes and tires/wheels, in depth research should be performed before one installs, changes or modifies anything related to these systems. I agree that bigger rubber usually helps in the looks department as I too am a fan of bigger/nicer wheels and tires. I,ve built some big trucks some of which were feature trucks at SEMA and yes, they looked the business but in reality, in most all cases, the integrity of the trucks is compromised. In other words, their designed in safety margins are reduced. The 450 is definitely a stout platform but after researching this in depth, adapters should be avoided period. Having a new set of wider 19.5 wheels seems to be the best choice for increasing the rubber size. Rickson has extensive experience I found with doing exactly this ( and I am not affiliated with them at all ). They will also build 8.25 X 22.5 wheels for the 450 that will directly bolt on w/o adapters but will also tell you they dont do it a lot. Buying shaved down 22.5s ( to 22s ) is stupid! Buying used 22.5 wheels that were used on semis is stupid ! Putting any wheel that requires an adapter is also not a smart move and I did it myself......but will never do it again either! I learn from mistakes and thought it prudent to at least mention using your head when contemplating changing certain systems for it could prove to be disasterous to you or some one else on the road. Children may be involved and they may be yours! I feel we all have responsibility owning and driving trucks on the road when there are Mini Coopers, Fiat 500s and Smarts ( we call them "stupids" ) on the road with us. Wheel manufacturers are most likely to research fairly significantly the safety level of their products prior to releasing them to consumers. When considering their products, I would call them directly and ask specific questions regarding DOT approvals, testing, and type of use recommended and not recommended. I would then search the web for any complaints or safety issues posted or mentioned. Once you do all of this, try to make a smart decision regarding the purchase putting safety first before aesthetics. Just my two cents but I,m sure there are a lot out there that fully agree. If you dont agree, thats your option but try to make an intelligent decision at least and ask questions.