A properly designed and machined wheel adapter is safe. I've heard good things about Skulte Perf, but have no personal experience with them. A lot of people have had good experience's with Motorsport Tech...I however am not one of them. There are a lot of hacks making wheel adapters, so buyer beware.
Something commonly omitted on custom wheel adapters are torque rings on the surface that mates with the rotor. Torque rings are designed into wheels so that they stay tight and maintain a consistent lug nut torque. They can be either concentric rings or pockets that align with the wheel stud holes that actually allow the lug nut to preload the wheel center and equalize the contact pressure between the mating surface of the wheel and the hub/rotor. Without this feature, you get very high contact pressure (and therefore stress) near the wheel studs and progressively less the further away from it you get.
Tobin
KORE3
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