As title says, I've bought RS4 19s second hand, but I tried putting them on today and they middle bore is too small. What are some ways I can troubleshoot this? Do i have to get the bore machine cut to a bigger size?
Find a shop with a lathe and they can open the register. It's going to have to be a big *** lathe though. A machine shop that does engine may be able to open it up on a vertical mill too. I've had it done before. Not expensive but not always easy to find a place to do it