Actually, the adapters are just flat and bolt on to the current 8 lug pattern. Then there is about an extra 2-3" of material with the hub centric piece for mounting the rim and the 10 bolt bolt pattern. Although, the rims are quite a bit thicker. I don't think it increases the track width much. The only drawbacks so far is stopping has increased a little and I have lost a little bit on the bottom end. I would not recommend the conversion without at least 4. 11's. The 22. 5's can be done with only a leveling kit. The 24. 5 have to have at least 8" of lift , because they do not make low profile tires for 24. 5" rims. I am running 255x70x22. 5 Sumitomo 209's. Most trucks I have seen are running some sort of hwy rib. I spend a little to much time in the deer woods so, I opted for a more lug type pattern. Although they are considered "drive axle" tires I have experienced no problems yet and have driven threw every weather condition imaginable except snow. I do recommend that when balancing the tires you both led balance them and powder balance for a perfectly smooth ride. I will be putting the powder in this weekend. I must say the experience I had with chromewheel.com was not the most pleasant. I took me 2 months and a set of 19. 5" rims that I had to send back a month wait for adapters. It was just a real hassle! I got my tires in Vero Beach Fl. from a local tire dealer St. Lucie Battery and Tire. When I got there I met the owner and talked with him and he asked what I payed. When I told him, he told me that he would of given me the same deal but with 4 brand new rims (rather than the refurbished ones that you get from chrome wheel. Also, if I had got the rims and tires at the same time that he would of given a larger discount on the tires which are almost 2k alone. The hole conversion is gonna cost right about 4. 5-5k including the lift and everything. They are great over there! Just ask for Artie Bellingham 772-461-1746. They got it all. Well I hope all this helps! Anyone got an answer about the speedo recalibration??