I prefer bolt on as you're not using a super long stud if you use a large spacer. I'd rather have short and fat as a base than long and skinny.
What hasn't be mentioned is the material. I've seen the actual spacer crack before but what's worse is using poor stud material! Do these cheap spacers even have a number on the back of the stud? My Z1's had no number which worried me. My new bolt on's are 10.9 grade and my stud to wheel studs are 190,000 psi ARP studs. The insides are red locktite down to 90 or 100psi. Wheel to spacer is 85-90psi. Being hubcentric everything should be fine as all the weights on the hub and not the spacers.
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13 370z-
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