Hello all, I’ve been giving thought to how to fit a set of wheels (Rota RB-Rs, 17x9 -13p offset front, 17x9.5 -19p offset rear) which are only available in 4x114.3 pcd (they were produced as a group buy for the HybridZ boys) to my Tr7V8. I know flares will be required.
The obvious way is via a set of adaptors (AdaptitUSA can do them for US$45 each), but this will, at the least, add another inch to the offset. Not to mention I’m pretty sure this is illegal in Australia. So, the thinking cap has been on, and I’d like to throw my ideas into the ring for constructive discussion.
First thought for the front:
Drill the existing hub for the 4 x 114.3 PCD. My thoughts are that there is not enough “meat†that far out on the hub due to the bevel edge of the hub. I know someone on this list did this for a Mustang four stud PCD, but my investigations suggest this is 4 x 108, significantly narrower. Could machine the hubs narrower and weld on a non-bevelled outer ring but this is now getting bigger than Ben Hur…
Second thought:
Get a pair of alloy hubs made with no bevel and the new PCD. The issue with this is cost. Unless someone knows someone with the hub already as a CAD file ready for CNCing I can see this being extremely expensive. Even with a file already in existence I think it will still be pricey.
Third thought:
Buy a pair of SD1 hubs and modify the SD1 struts sitting in my garage to fit a Tr7, then change PCD on SD1 hubs. Problem with this is that the SD1 hubs are 5 stud so trying to fit the four studs around the five brake disc studs won’t work? Don’t have the brake disc pcd to confirm, but eyeballing the photo on the Rimmers site suggests it can’t be done.
First thought for the rear:
Drill the brake drum for the new pcd in between the existing studs. New studs are then fitted only through the drum face, not the axle flange. The wheels have gaps between bolt holes so the nuts which would have to go on the existing studs would not foul. The issue here is that of the thickness of the drum face and whether it is thick enough to take the load. This method is used on unbraked trailers but I believe the face is pretty thick for those models. I guess theoretically it wouldn’t need to be thicker than the axle flange, would it? How thick is that?
Second thought:
Have the axle flange and drum face drilled for the new PCD. The issue here is the outside diameter of the flange and whether there is enough meat to take the PCD out to 114.3mm from 95.25mm. And whether the wider PCD means the studs will foul the internal bits within the drum as they spin.
Comments, or anyone with a simple solution I haven’t thought of?
Craig
Tr7V8
