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Sometimes you need more track width. Sometimes you need more wheel clearance. And sometimes you're simply unwilling to tolerate wheels hiding half a mile inside the fenders.
Once you're moving the wheel outward by 3/4" or 1", however, there's enough distance between the wheel and the original hub face that a simple flat spacer isn't the best solution.
That's where these come in.

What widening the track does is reduce lateral load transfer for a given center-of-gravity height, allowing the inside and outside tires to share cornering load a little more evenly.
It can also solve wheel and suspension clearance problems, allow different wheel offsets to work properly, or simply put the outside face of the wheel where it should have been in the first place.
Or, stated less scientifically: wider can work better, and wheels sitting hella flush still look good.

The Corvette hub has a raised center pilot that helps locate the wheel concentrically during installation.
Add a 3/4" or 1" flat spacer and the wheel is now sitting too far away to engage that original pilot.
Our spacer registers on the factory hub and then provides a new precision-machined pilot on its outer face for the wheel.
In other words: move the wheel outward without giving up the hubcentric interface that was there before.
Adds 0.750" of wheel offset per side while maintaining a precision-machined hubcentric wheel pilot.
Finished weight is approximately 1 lb per spacer.
Adds a full inch of wheel offset per side for applications that need serious track-width or wheel-position correction.
Finished weight is approximately 1.2 lb per spacer.
A 3/4" or 1" spacer moves the wheel well beyond the usable thread length of the factory studs.
Longer wheel studs are therefore required. We recommend ARP 100-7713 studs so you'll have all the length you'll need with any spacer and wheel combo.
As with any wheel installation, verify proper stud engagement, lug-nut compatibility, wheel clearance, and final torque before driving the car.
If you only need a small change in wheel position, our standard Corvette spacers are available in 1/4" and 3/8" thicknesses.
No reason to add 3/4" of track width when all you needed was another quarter inch of clearance.
Shop Narrow Wheel Spacers
Each spacer starts as 6061-T6 aluminum and is CNC turned with less than .0005" runout.
The stud holes, hub interface, replacement wheel pilot, and weight-reduction pockets are then CNC machined with tightly controlled dimensions.
We could skip the pockets and save ourselves an entire machining operation, but each spacer would weigh roughly another three-quarters of a pound.
Since we're bolting these things to the rotating, unsprung end of the car, that seemed like a lousy place to get lazy.
These spacers are turned, milled, inspected, anodized, and engraved in the USA from 6061-T6 aluminum.
They're still just wheel spacers. We simply don't think "just a wheel spacer" is a good excuse to make one poorly.
If you somehow manage to damage one through normal use, we'll replace the failed spacer free of charge.