re Santee kit
You are smart to check out these kits before purchasing! The Santee kit is extending the tranny and spacing out the primary, which stresses your tranny and starter. They advertise that the mass of the weight is still centered, but it only makes sense that some of the weight is shifted to the left. You cannot replace the existing swingarm and put on a wider tire without shifting the center of gravity if you are using the existing left-side drive tranny. The ONLY way to safely avoid this and go to a wide tire is to go to a right-side drive setup which means a wider tire than you were thinking about. If you want to go wide, in my opinion the 300mm conversions with right-side drive are safer than the smaller tire conversions with offset kits. You can take your hands off the wheel and still go straight down the road just like it came from the factory. For more info on wide tire conversion kits for softails, check out Chubby's Choppers website in Lansing MI and hopefully you will get the info you need to make an informed decision. Good luck!