I would say how ever much gap you have from the face of the flange, to the end of the pipe inside the flange. Put a tape measure in it. It should be like 1/4 inch.
What it's the take out off 12 inch 90
A butt weld is where the diameter of the pipes welded together are the same, a socket weld is where a larger diameter pipe is fitted into a smaller one. In making a butt weld, the pipes (or pipe and fitting) usually have an angle machined or ground into the outside corner, so when they are placed together face-face, there is a circumferential V shaped gap serving as the weld prep. In a socket weld, the pipe is inserted into the socket, backed off slightly to make a gap between the end of the pipe and the bottom of the socket, and the weld is made around the outside diameter of the socket to the outside diameter of the pipe. The gap at the bottom of the pipe prevents thermal expansion from stressing the joint during or after welding.
Take your measuring tape on the inside of the flange, and measure end to end. Taht measurment will give you the take-off....
if it is a PVC flange glued on to the outside of 3" PVC pipe, there is a tool available that will cut it off and you can glue a new flange on the undamaged pipe. It's called a Flange-off. Available at Locke plumbing supply.
15mm is the closest thing i can find to fit, but still has a liottle slop on socket .Will definitely have to use a wrench on the front bolt, or cut it off.
Unbolt from the block & take the nuts off studs to exhaust flange. You will need a new gasket for the block & a new one for the flange.
flange off tool.....Locke Supply carries them
After you take off the tire, pull off caps where the caliper bolts are. You need 7mm Allen wrench to remove. I recommend 7mm Allen socket that you can get at your automotive store. Then use socket set to take off rotor bracket, I think it's 18mm socket. Remove rotor. If it's rusted on, hit it with rubber mallet or hammer, it will come off.
Take a socket lug and pound it into the key lug. O weld another lugnut on top of the the one you can't get off, then crank it off.You can try dealerships or tire stores, they often have sets of the special lugs.
You need an 18 mm spark plug socket.
Leg of the weld. Fillet is the part you cut off e.g. a corner...
Take a metal pipe a wide one and weld it to the rim of the other tire... center it and then weld the other side to other rim... have hollor solid pipe so u can put on and take off