I used them on my ZR with very good luck, was able to run 250 screws. So I tried them in the new F7, only able to put 121 in due to the obvious layout. I have a standard 1" track, rode with them once about 70 miles and after checking them found a couple starting to rip through the bottom of the lug. I think there is just to much power to run that few, so I took them out and have no plans to do any studding. I'm not an ice racer so don't really need them, already beating everyone on the hard pack.
no they arent predrilled but thats where u can put them and yes they work good but not as good ans regualr studs. I would go with C&A if u get any. They are a lot lighter than regular studs less money and dont rip ur track all to hell.
We had two F7's with the lug screws. Both have been removed and the track stud with Woody 144 pattern. It is like day and night. If you want any screw in studs we have the ones we removed. I would not recommend doing the screw in.
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