Are your billet wheel adapters safe?
Yes, they bolt on exactly like a wheel, and are designed stronger than the wheel itself. If you can change a tire, then you can use our wheel adapters. Our adapters have never had any failures, and are even safe for racing. We have been using them on our twin turbo Camaro for years.

Why should I buy Skulte Performance Designs wheel adapters?
Our adapters are precision CNC machined from aerospace grade 6061-T6 aluminum, and come with heavy duty pressed in Grade8 SAE or Grade 10.9 metric studs. Other companies may not be using certified materials, proper design tolerances, or heavy duty studs. Their adapters may look the same, but may vibrate at speed, or even fail from hidden material or machining defects. We choose to build the best adapters, using the best components, and will never sacrifice safety.

Can I try out different adapter thicknesses?
If you're not sure of what thickness you need, we keep 1.25", 1.7", 2", and 2.25" Chevy bolt pattern (5 on 4.75") adapters in stock. You are welcome to exchange the adapters for a different size as long as they haven't been driven. This is a good alternative if you're not sure a custom adapter thickness will work properly.

Can I return custom adapters if they don't fit?
Sorry, not if they are machined as ordered. We take every step possible to make sure the adapters will fit your car and wheel, but ultimately, they are machined to your measurments. Measure twice, cut once! If you've ordered adapters, and we haven't machined them yet, and determine that your measurements weren't correct, contact us ASAP so we can make the changes. Please let us know, and we'll do what we can.

Will your wheel adapters cause vibrations?
Our billet adapters are hubcentric, and also have conical lugnut seats that center the adapter to the hub. If the adapters are first finger tightened in a star pattern, then torqued to 30 ft-lbs, and finally ftorqued to 85 ft-lbs, the adapters will center themselves to the lugnuts. Other adapters that use the older mag-wheel style shank and washer to bolt the adapters to the hub will have some slop, and may cause vibrations at higher speeds. We also recommend wheel-centric lips on any adapters that are thicker than 3 inches, especially in the front. Under 3 inches, we have never had any vibration issues, although we can add the wheel centric lip if requested on custom adapters. We use the SPD billet wheel adapters on our '89 Camaro, which regularly sees high-speeds at the race track without vibration.

Do the bolt-on wheel adapters increase the load on suspension parts?
The suspension loads are only affected by the centerline of the tire. Billet adapters usually correct offset issues when bolting newer style high offset wheels onto older cars that were designed with low offset wheels. A wheel with a 51mm offset and a 2" adapter is identical to the suspension as a 0mm factory wheel. This loads are the same on the wheel studs, bearings, bushings, because the wheel is in exactly the same location on the car.

If it helps, imagine two identical wheels, with only the offset being different. Bolt the 2" adapter to the 51mm offset wheel, and it will measure exactly the same as the 0mm offset wheel.

Will my studs break if I use bolt on wheel adapters?
No, the loads on the studs are identical to just bolting on wheels if the centerline is the same. Slip-on spacers will increase stud loads.

Are slip-on wheel spacers safe?
Slip on wheel spacers are safe, as long as you limit them to 1/4" or less. As the wheel is moved further out, the bending load on the wheel stud increases. We don't recommend using slip-on wheel spacers greater than 1/4" thick. New heavy duty studs are recommended as well. Slip on wheel spacers are not the same as bolt-on wheel adapters.

Can I use your adapters for racing or rock crawling?
We've been using the billet adapters on our twin turbo Camaro road race car. So far we've torn driveshafts, snapped axles, and broken torque arms, and the adapters have always been perfect. We are great at product testing (i.e. finding the limits of components when they break!). If we can't break it, it won't break.

Can you build them in steel?
We choose to build our adapters from billet aluminum. When properly engineered, the adapters are stronger than the hub they bolt onto, so it doesn't make sense to machine much heavier adapters from steel. Our adapters have been used on heavily modified 4x4 trucks, rock crawlers, and full-size trucks, without any problems.

I just bought new wheels that have a different number of studs. Can you machine wheel adapters to let me use the new wheels?
We custom machine 2 piece wheel adapters to change the number of studs. The first half will bolt to your hub, and is thick enough that the studs are entirely inside the adapter. The second half is precision machined, pinned, and bolted to mate exactly to the first half, so there are no high-speed vibrations, and has the wheel's number of bolts. These adapters involve much more machining than the single piece adapters. The thinnest these adapters can be machined are 1.75", and will be thicker for larger bolt circles.

How long will it take to machine the custom wheel adapters?
We like to have 2 weeks to schedule and machine the custom wheel adapters. This lets us machine similar adapters in batches, to lower your cost. If you have an event you're planning on attending sooner, please contact us, and we'll try to reschedule your adapters to get them sooner. We can also ship 2nd day and overnight to save shipping time.

Do your billet adapters come with lugnuts?
Of course! Chromed or nickel plated lugnuts are included with all adapters

Can you machine adapters thinner than 3/4"?
In order to have the proper strength for the lugnut and stud seats, the thinnest bolt-on adapters we'll machine is 3/4". Be advised that anything thinner than 1.25" will have the lugnuts sticking out past the face of the adapter, and requires cavity back rims where there are pockets in between the lugnut holes.

Should I use anti-seize on the studs? Won't it cause the lugnuts to loosen easier?
Definitely! A small dab of anti-seize on both the hub and adapters studs make torque values much more consistent, and prevent the lugnut from seizing after hard racing or a salty north-east winter. As you torque the lugnut to spec, the stud acts like a spring, and gets pre-loaded. This tension in the stud is what holds the lugnut tight against the wheel (or adapter). By lubricating the stud with anti-seize, you make sure the torque on the lugnut will go to tensioning the stud, rather than friction that does not increase the tension, and will make it easier to lose pre-load and loosen. As long as there is tension, the lugnut will not loosen.

Will I have to constantly retorque the adapters?
We recommend re-torquing the adapters after the first 5 miles of use, when brand new. This lets the lugnuts seat to the adapters. After they've been installed, you can treat the adapters just like a set of wheels. We've never seen lugnuts loosen when properly installed.

I have a (insert dyno hp here!) HP supercar. Can I still use the adapters safely?
Our adapters have been run on pro-stock cars without any problems. They performed flawlessly. Its doubtable you'll be able to stress the adapters any further.

Can you machine billet adapters for my Landrover Discovery 1, Defender 90, Defender 110, or Range Rover Classic?
Sure! We've added custom Land Rover billet wheel adapters to our website. Your Land Rover Discovery has a wheel bolt pattern of 5 on 6.5" with a very large centerbore. This requires a much larger piece of billet and involves significantly more machining, so they do cost more than our normal custom adapters.

Can I adapt 10 lug semi-truck wheels to my 8 lug pickup truck?
We can machine custom adapters for the semi-truck wheels, but they involve a lot of machining and will not be cheap.