Spacers OK for track and autocross?

[rastta]

I've run spacers for years on track - but always hub and wheel centric and always with studs. By wheel centric I mean that the spacer is designed to fit in the wheel where the normal hubcentric ring is for those wheels that required it.

[jsceash]

I use 15MM spacers on the front and 5MM on the rear. This is to prevent rubbing inside. I would be careful in some organizations the stock class does not allow spacers if the track is increased +/- 1/4".