I´ve got a new set of Challenger wheels, 17" 6,5J, and I have just finished refurbishing a set of 406 Brembos. Got a pair of Xantias 288x28 discs, and decided to try at home and see how they look like all together, before installing it on the car.
The thing is, I placed the Challenger facing down, a 12mm spacer so that the wheel sits in the same place as the Cyclone (Challenger ET 31), then the disc, and when I put the caliper it sits on the inside part of the wheel!!
The outer part of the caliper, where it says Brembo, hits the inside face of the wheel spokes or arms.

Am I missing something here? Has anyone tried this combo?
I guess this means I´ll need bigger spacers,

I mounted all today to try, fitted 16mm spacers with the challengers (totals ET 15) and the calipers doesnt hit the wheel, but it has almost no clearence. I´ll try with 18mm, to give at least 2mm between caliper and wheel.
The other thing, is that the discs it totally out of the center of the caliper, 288 Xantia disc, is completely outwards in reference to the caliper, almost no clearence in the outer side, and about 3 or 4mm maybe out of the inner part. No wonder why the squealing under light breaking

not many bother with 406 brembos here, they were so 2007 most have either gone ott with renaultsport brembos or seen the light and used uprated pads in std calipers.

your claim of offset causing it doesn't explain why a std 406 also squeals with larger zero offset discs.

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The disc sits so outwards, that it even lightly touches the caliper itself. If outer pistons have no travel, and inner have to travel about 4mm to reach the disc, I guess that inbalance must bring some vibrations. If the std 406 also squeals, then something in the design of the brakes went wrong, something is vibrating there. Not tha calipers cause they are same for several cars, but maybe the hub, the material of disc and/or pad, who knows.
I have only mounted it, to see clearences and that stuff, havent tried them yet. But I think I wont even try them with those discs, I´ll try with C5 304x28 discs, or I´ve found some Alfa 310x28 and Mercedes 312x28 that the offset would be perfect to fit them with an adapter for the caliper, and move the caliper to the inside, and make the disc sit exactly in the middle, plus reducing size of spacer for the wheel. Alfa´s are 4 holes, I can do 4 more with correct PCD, or I can try to ask for correct PCD straight to the factory.

In my case, offset is the problem, both of the wheel and the disc, not the clearence between the caliper and the inner side of the wheel as you show in your picture, my wheels are 17" so theres plenty of room, the problem is the clearence between the caliper and the inner face of the spokes of the wheel. With spacers of 16mm, totaling et15, they dont hit the wheel, but they´re just to close!! Should fit a 17 or 18mm spacer to be safe, but i dont want big spacers. I´d rather move the caliper inwards than the wheel outwards

Yes, 40 profile would be almost exactly the same, but Uruguyan roads are s**t, so I fitted a bit more profile to try to protect the wheels a bit more, and a bit more confort in the ride.
Uneven wear pads also happen on calipers with pistones on both sides? I thought that happened on single piston calipers
Guess i'll try with C5 304x28 discs. Only problem is they are 5x108, i'll have to do 3 more holes for a 4x108 pcd. Or a Mercedes E320 312x28, still need to sort the pcd

So the disc is hitting the caliper?

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I just tested 1 wheel with the caliper, havent take a ride with those yet, but I guess they´ll be perfect! Im waiting to get the car painted, and there I´ll fit everything to him, I want to do all at once. Im now testing and trying all I have, to sort this kind of things out before.

And yep, the discs hit the caliper, very slightly, but they do. I didnt even tried the brakes, I only mounted them (as you can see I havent even fitted the pistons to them), and spin the wheel with my hands just to check clearences and such.
I could only noticed that it was hitting, when I spinned the disc alone, without the wheel. Once i fitted the wheel, and spinned all together, I couldnt even notice it was hitting there, guess the contact was so light that the weight of the wheel wouldnt let me notice, only saw that some caliper paint was in the disc now.

According to what I measured (may not be exact) theres a "negative gap" of 0.05mm between disc and caliper. Once fitted and used a bit, I bet the disc will act like a file over the caliper and trimm that gap, but still, will be out of center and under some temp, or certain conditions, it must keep touching there and maybe thats one cause for vibrations.

It may be a good idea to try (think I´ll do that) to file down the two "rings" it has on the mounting holes:



Take 1 to 1.3mm away from those (has 1.6mm in mine) and the caliper will come out just enough so that the disc sits in the middle of the caliper.

Heres the problem:



There you have 1.25mm gap at each side/arrow and the disc is displaced 1.3mm

I'll try to sell this discs, and build a set of bells and rotors.
By the way, anyone knows the minimun diameter the inside of the bell needs, to clear the hub? So I can give it a bit more offset to the bell to move everything inwards, and not need big spacers.