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Which Air Ride is Best For My Car?

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Which Air Ride is Best For My Car? 

When it comes to bagging a car for the first time or even dealing with an unusual car that isn't often bagged, a common question we get is, "What suspension is the best?" Here at Bag Riders, we say that a bolt-in kit will always be the best. Since the kits are specifically designed for your car, they can be installed with little-to-no modification and will have the best travel and performance. However, these bolt-in kits are often the most expensive route, or they may not be available for uncommon platforms. In this post, we'll give you the pros and cons of the other types of air suspension, and you can make your call on which style best suits your needs. The first thing we look at is how the factory spring is mounted on your vehicle, as this plays a significant factor in what options will work. A spring can either be mounted to the damper, or it may be separate, which is very common in the rear of most modern vehicles. Keep in mind that the front and rear of your car will often be different types and therefore need different setups. 


For Suspension Where The Spring Is Mounted To The Damper, You Have The Most Options: 

For Suspension Where The Spring And Damper Are Separate Units, You Are Limited To The Following: 


Bolt-In Air Suspension 

Bolt-in suspension kits will always be our go-to recommendation as long as there is one for your vehicle. These kits are designed specifically for your car. Because of this, they usually retain the same setup as your factory suspension and come with vehicle-specific brackets/mounts that will bolt right in with little-to-no modification. Bag Riders carries bolt-in kits from Air Lift Performance, D2 Racing, TruHart Suspension, and UAS (Universal Air Suspension, but referred to as UAS to avoid confusion with universal bags). Bolt-in kits will generally give you the most usable travel compared to slip-on or thread-on conversions, and the kits are tested before being released to ensure a comfortable ride. 


Air Lift Performance BMW F30 3 Series bolt-in suspension kit



  • Travel Range - Because the dampers and air springs were designed with your specific vehicle in mind, in most instances, the travel range of a bolt-in kit will outperform the other options.
  • Starting Fresh - Your car begins with brand new dampers, meaning a longer life ahead of them. These dampers are valved to match the air spring resulting in a more comfortable ride.
  • Install Guide - The top brands often have installation instructions that break down the entire process. This can be a significant factor if you think of doing this project in a home garage.
  • Warranty & Support - This is the only option that offers the buyer a warranty against manufacturer defects. If you convert your coilovers to hold a thread-on or slip-on bag, you will no longer be covered under that Coilover manufacturer's warranty. As a Bag Riders customer, you have our expert staff to call for support, in addition to the manufacturer. 



  • Limited Applications - Bolt-in kits are designed with a specific car in mind, and therefore manufacturers cater to popular models. Less popular vehicles may not have kits available.
  • Development Times - When a brand new car is released or a famous model changes generations, manufacturers need time to research & develop a new kit to match the new suspension. Therefore equipment may not be available right away.
  • Price - Often, a bolt-in method is the most expensive option when looking at the cost of parts. However, if you are paying someone to install it, that can result in a less expensive installation or easier installation if you're doing it yourself. 


Slip-On Bags

New advancements in technology have moved the UAS Aero Sport out of the spotlight in favor of thread-on conversion bags. Slip-on conversions were quite popular when Bag Riders started in 2009. They work well in MacPherson applications, but their "donut" style manufacturing can be pros and cons. These bags are still the only solution for converting OEM dampers to an air setup. 


Universal Air Aero Sport with cutaway view



  • Compatibility - UAS's Aero Sport line slides over your existing damper, and since it is a sealed unit, it can be mounted around a variety of existing dampers.
  • Price - Cheaper than a bolt-in kit but more expensive than thread-on bags, these bags require brackets to properly fix them in addition to the cost of the bags.
  • Keep OEM damper control - Since these can be slid over many factory dampers, you can keep any OEM damper controls while adding the ability to slam the car. 



    • Size - These bags require at least 6" diameter clearance. This can cause issues with double-wishbone suspension as the upper arm can contact the outside of the pack. With MacPherson cars, adding camber can cause the inside of the bag to touch the wheel well, or broader and larger diameter wheels can contact the outside of the pack.
    • Travel Range - although these bags have an average amount of travel, you may be limited in how low you can go if you use them with a factory damper. Factory dampers tend to be taller than aftermarket dampers, limiting you to the lower end.
    • Unique installation - The universal mounting brackets will often require welding or fabrication to fit on your car. In some cases, you will need to cut and modify OEM components for these to work. UAS makes threaded brackets for coilovers, but if you choose between a thread-on bag or these slip-on bags, we recommend the thread-on. 


Thread-On Bags

A newer solution to going air, thread-on bags are famous for customers who already have coilovers and are trying to stand on a budget. You'd take your Coilover apart, remove your spring & spring perch, and install the bag. The bag itself is not sealed but is slid over the top of your coilover, and the bottom of the bag is then threaded onto the damper body to fill it. The top of the bag seals to the damper rod once the top hat is reinstalled and tightened down. Bag Riders currently carries VERA Bags for BC Racing Coilovers, and in the past, we took Bags by Only Charged Dubs (Bags by OCD). These bags only work for applications where the spring is mounted to the damper. 


VERA thread-on bags in 3 styles; double bellow, sleeve, and slim double bellow



  • Straightforward Install - Remove your spring and spring perch, and thread these on in their place—no extra brackets or mounting hardware necessary.
  • Price - Thread-on bags can be the most cost-effective solution to bag your car, with VERA bags at $225 per bag. The cost of compatible coilovers plus thread-on bags is usually similar to a vehicle-specific kit. If you don't already own compatible coilovers, we would recommend seeing if there is a direct bolt-in kit for your vehicle.
  • Diameter Options - Have an area where a slip-on bag is too big? Smaller diameters mean more adjustment to camber and the ability to run wider wheels without worrying about contacting the bag. A slim double bellow could work instead.
  • Variety of Vehicles - Since coilover manufacturers often make more kits than air suspension manufacturers, you can now bag more unusual cars without worrying about custom fabrication.
  • Travel Range - Compared to slip-on bags used on OEM suspension, these bags tend to drop a car lower because they're mounted on aftermarket coilovers that generally have shorter-than-OEM dampers. However, if you are using a very low coilover package (BC Extreme Low), you may not be able to lift the car as high due to the shorter damper.



  • Limited Compatibility - Currently, we only carry bags that match BC Racing's coilovers. If you have another brand, they will NOT fit. There are a few BC Coilover kits that also use different size dampers. Please call us before purchasing if you are unsure about compatibility.
  • No Guarantees - Bag Riders can help you verify whether the bags will physically thread onto your coilovers. Still, unless we've already dealt with a customer on the same car with the same coilover variant, we can't determine whether the coilovers have too little or too much travel to work well and ride comfortably. 


Universal Bags

These bags have been around for as long as air ride has. It's simply a sealed bag that can be used in place of a standalone spring. These are extremely common in rear suspension setups nowadays and come in a wide variety of diameters and heights to suit almost any application. They usually require mounting brackets to be securely installed. These will not work for applications where the spring is mounted to or around the damper. 


3 styles of Universal bags; Firestone sleeve, Slam Specialties double bellow, and Universal Air single bellow



  • Price - Universal bags are among the cheapest you can purchase as they are some of the easiest to manufacture and range in price between $50 and $165 a bag
  • Diameter Options - These bags have the widest variety of heights and diameters as there are so many different kinds and should be able to fit in most applications.
  • Travel Range - Due to how many options there are, the range of travel is usually not an issue unless the damper limits you on the same corner of the vehicle. 



  • Brackets Required - Standalone springs often sit in spring pockets or around a nipple at their upper mount. When converting to a versatile bag, you may need a lower bracket that elevates the bag up out of the pocket, so it doesn't rub or an upper mount that goes over the nipple so the load is secured and can't slide.
  • No Guarantees - Bag Riders can help verify whether the bags will physically fit in the space you have to work with. Still, unless we've dealt with a customer who has talked to us about how they fabricated their bracket setup, we cannot provide advice on the best way to install brackets, and we recommend pairing up with a shop. 



If a bolt-in kit is available for your vehicle, we suggest going with that. The research and development that the manufacturers put into their products mean you'll get a kit that works well out of the box without custom fabrication or hours of dialing ride height and quality in. The other options can all be cost-effective alternatives, but choosing depends on what brand of suspension you are currently on and its design. Often you'll end up using a mix of thread-on, slip-on, or universal bags to best suit your suspension setup. If you still are unsure about what to choose for your car, give us a call or email us at and we're more than happy to answer any questions you may have!



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