Just upgraded to bbk with tsw interlagos , would it be safe to run 3mm spacer with stock studs ?

 

Yes, but I'd also verify to make sure that the aftermarket rotor hat didn't also add some additional effective thickness.

I know that the Stoptech ST40 rotor hat is like the equivalent of adding a 2-3mm spacer. I know for sure since I rolled fenders prior to getting the bbk and had no issues rubbing, and after the BBK definitely had rubbing issues in areas where it wasn't a problem before. Adding a 3mm spacer on top of that would be like effectively adding a 5-6mm spacer to the OEM config.

 

Interesting , never thought of that

 

Dang. Didn't know the ST40s added an effective spacer. I just picked up some ST40s.

 

Note that if you do need to make a change and don't want to upgrade the studs (which is a big job on the S2000 because you need to pull the hubs, which means replacing the bearings...) you can buy a few mm by using extended thread lug nuts, like these for example:
They basically reach into the lug nut hole to grab more threads. However, the TSW wheels have fairly small holes; I needed to bore mine out very slightly for ET lug nuts to fit. Was still much cheaper than replacing the studs though, although eventually I did that anyway.

 

did not know that, Whoa! so my x10 +50 is effectively a 45-44 with 3mm spacers needed to clear the ST40 calipers. Was wondering why they were sticking out so damn far @ front even with -3.5...

 

I can't remember what spacer size I'm running, it's either 2 or 3mm. I'm running a stoptech kit on stock studs and haven't had an issue. Not saying it's safe (more threads is better) but I think I've done ~8 track days or so with 255 rs4's with this setup.