I've never used them...but they decrease the backspacing...so the track is widened...which is more stable...but, they also make the tires stick out further from the wheel wells...so, on an X, that would tend to make the tires more likley to hit the edge of the fender/wheel well arch area when the tire goes up on compression.

They are also pretty expensive..so you could weigh the cost of new rims with less backspacing against the cost of spacers to get the same effect. For steelies...new rims win, for expensive alloys...spacers might win...for actual practicality...just keep the stock rims and backspacing.



Any particular reason you are considering them?