Used properly, wheel spacers can be really trick. You can use them as a roll balance trim tool like you would with an adjustable anti-roll bar. But... you are also changing pretty much every geometric parameter of your suspension, so the compromises are hard to quantify. Here are a few that come to mind:

=Spacers will increase track width which reduces your lateral load transfer and increases the grip on the inside wheel of a turn.

=You decrease ride and roll rate. That will increase available grip, but change where you are in terms of camber gain. Probably an overall beneficial trade off.

=Adding spacers up front could add lots of scrub radius and do dirty, dirty things to your steering feedback. Or it might not.

=Are you sensitive enough to feel the difference?

 

also around around your track for spacer, most of the time it will not pass tech. For one thing, they put more stress on the axle just by having more leverage to the load

adding traking to the rear make the rear less likely to step out but like everything alternation, there's a pro and con side to it.

like other people already said, proper suspension geometry is way way way complex for most of us, some one already mention the horrid of scrub radius/dave pt.

 

So basically putting all technicalities aside, on an S2000 with spacers within 1" you are going to only experience benefits.

But Just food for thought, a stock wheel with a 1" spacer will put no more load on an axel/bearing then an aftermarket wider/ larger wheel would, which we all choose do anyway. You are extending the overall backspacing further from the axel, same as a wider wheel, or wheel with more back spacing or both, the surface area of the spacer is the same surface area that rides on the inner wheel without it. How many wheel/axel/bearing failures do you come across on the board? Exactly