Using LX (New Charger/Magnum/300) Wheels on a 74 Dart
Bringing this post back from the dead. Not because I have proof of anything but because I have a new and interesting data point in regards to the whole late model bolt pattern discussion.
I’ve been working on a swap using Scat Pack 4 piston Brembo calipers and rotors. The most recent stage was figuring out how to get the SP rotor centered on the cut down hub. The hole in the center of the rotor is just slightly bigger than the pilot area on the hub, but it is tight enough that no machined ring could possibly be made (2.85” OD and .015” wall).
Since I bought a 3D printer for this project, I figured why not print up some bushings to fill in the gap between the 16.6mm holes in the rotors and the 1/2" wheel studs to center the rotor. So, I did up some bushings that had the centers offset to match the 115mm LX bolt pattern and the 4.5” A-Body pattern. Because it looked visually like the patterns actually match, I also did some that had the hole centered and had a uniform wall thickness.
Guess which one fit best? The bushing with the uniform wall thickness. They fit great in all 5 holes and the rotor slips on and off very nicely.
In this case, this is a used rotor that according to the JY tag came off a 2006 Magnum SRT-8. The counter guys said it was an OEM rotor that had been hanging on their wall for years, but no idea how they knew it was an OEM rotor. Either way, I am pretty sure the rotor is drilled for a 4.5/114.3mm bolt pattern. Just no way these bushings would fit otherwise.
Now, I am not saying that all LX/LC cars have a 4.5” bolt pattern. I have a couple of Brembo drawings that show a 115mm bolt circle and Brembo seems to be pretty tight on their parts so I would bet a rotor from them would not fit like this one does. Nor does this mean that the bolt pattern on the hubs of an LX/LC car would match the rotor. The holes are pretty big so it is possible that this rotor would slip on just fine even if the late model hub had a 115mm bolt circle.
But I do find it interesting that it appears this possibly OEM rotor has a 4.5 bolt circle rather than a 115mm bolt circle.
Here’s some pictures.
Bringing this post back from the dead. Not because I have proof of anything but because I have a new and interesting data point in regards to the whole late model bolt pattern discussion.
I’ve been working on a swap using Scat Pack 4 piston Brembo calipers and rotors. The most recent stage was figuring out how to get the SP rotor centered on the cut down hub. The hole in the center of the rotor is just slightly bigger than the pilot area on the hub, but it is tight enough that no machined ring could possibly be made (2.85” OD and .015” wall).
Since I bought a 3D printer for this project, I figured why not print up some bushings to fill in the gap between the 16.6mm holes in the rotors and the 1/2" wheel studs to center the rotor. So, I did up some bushings that had the centers offset to match the 115mm LX bolt pattern and the 4.5” A-Body pattern. Because it looked visually like the patterns actually match, I also did some that had the hole centered and had a uniform wall thickness.
Guess which one fit best? The bushing with the uniform wall thickness. They fit great in all 5 holes and the rotor slips on and off very nicely.
In this case, this is a used rotor that according to the JY tag came off a 2006 Magnum SRT-8. The counter guys said it was an OEM rotor that had been hanging on their wall for years, but no idea how they knew it was an OEM rotor. Either way, I am pretty sure the rotor is drilled for a 4.5/114.3mm bolt pattern. Just no way these bushings would fit otherwise.
Now, I am not saying that all LX/LC cars have a 4.5” bolt pattern. I have a couple of Brembo drawings that show a 115mm bolt circle and Brembo seems to be pretty tight on their parts so I would bet a rotor from them would not fit like this one does. Nor does this mean that the bolt pattern on the hubs of an LX/LC car would match the rotor. The holes are pretty big so it is possible that this rotor would slip on just fine even if the late model hub had a 115mm bolt circle.
But I do find it interesting that it appears this possibly OEM rotor has a 4.5 bolt circle rather than a 115mm bolt circle.
Here’s some pictures.
