Safe to use Wheel Adapters 5 on 4" to 4.5"?

Also I got the ssr spikes from jegs and they stated for street use only. They will be ok for 400hp but Drag radials and a warm day, who knows?? Also you want to match the center hole with your hub size or buy hubcentric kit. It centers the wheel and takes torque issues off the studs themselves. I thought about drilling the 4" axles but didnt want to try it myself and machinists here wouldn't do it as a liability. It moves the stud closer to the outer edge. Not saying it cant be done tho and you will still have to drill the drums. 8-1/4 drums and plates work too. You will have way more choices once you crossover to the bigger pattern. 73 and up were 4.5 if you can locate some used ones.