If you own a 2017 or newer Harley-Davidson Touring model, you know the factory suspension can leave a lot to be desired, especially when you’re carrying a passenger or gear. The American Suspension B17 kit is one of the most popular upgrades for baggers, offering a smooth air ride that lowers your bike when parked and provides a controlled ride on the road. But what exactly comes in a B17 kit, and which parts do you need? This guide breaks down every component, from the air shocks to the compressor and wiring harness, so you can make an informed purchase.
What Is the American Suspension B17 Kit?
The B17 is a complete air ride suspension system designed for 2017–2023 Harley-Davidson Touring models (Road Glide, Street Glide, Electra Glide, and Road King). It replaces the stock rear shocks with adjustable air shocks and adds a front air suspension option for a fully adjustable ride. The kit is named after the 2017 model year introduction, but it fits all years up to the current generation (as of this writing).
Key Benefits of Upgrading to B17 Parts
- Lowered profile: Drops the bike 2–3 inches when parked for a custom look.
- Ride comfort: Adjust air pressure to suit your weight, load, and road conditions.
- Load leveling: Maintains ride height with a passenger or luggage.
- Increased safety: Better rear suspension reduces sway and improves cornering.
Components of the American Suspension B17 System
Before you buy, it’s important to know what’s included and what you might need separately. Here’s a detailed look at each part.
Air Shocks (Rear)
The heart of the kit is the rear air shocks. These are nitrogen-charged, progressive-rate shocks with a dual-air fitting. They replace the stock shocks and come in two lengths: standard (for normal lowering) and extended (for more travel if you also have a front kit). Each shock has a separate air line for independent adjustment. The shocks are made from billet aluminum with a chrome or black finish. When choosing, consider the finish that matches your bike and whether you want the extended length for additional drop.
Front Air Struts (Optional)
For a complete system, many riders add the B17 front struts. These replace the stock front fork springs with air-over-oil struts. They allow you to adjust front ride height independently from the rear. The kit comes with all necessary hardware, including brackets for the air lines. If you plan to do a full bagger air ride, the front kit is highly recommended to avoid a chopper-like rake.
Air Compressor and Management System
American Suspension uses a compact, high-output 12V compressor that comes pre-wired with a harness. The compressor mounts under the side cover or seat. It feeds air to a small 1/2-gallon tank (included in most kits). The system uses a simple manual valve setup or an optional electronic controller. The manual system uses two Schrader valves—one for the front, one for the rear—that you fill with a standard tire pump. For easier on-the-fly adjustment, you can upgrade to the RideTech e-Level digital controller, which lets you set ride height with a push button.
Air Lines and Fittings
The B17 kit includes 20 feet of 1/4-inch DOT-approved nylon air line, brass compression fittings, and necessary adapters. The lines run from the compressor/tank to each shock. Installation requires routing the lines along the frame, which is straightforward with the included zip ties. Be careful not to kink the lines; use a heat gun to soften them if needed.
Wiring Harness
A complete wiring harness is included for the compressor and optional controller. It connects directly to the battery with an inline fuse. The harness has a relay to prevent battery drain. If you add the e-Level controller, the harness has additional connectors for the dash-mounted touchpad.
Mounting Brackets and Hardware
All kits come with stainless steel brackets for attaching the compressor, tank, and shocks. The rear shock brackets are specific to the B17 chassis (2017+). The front kit includes fork cap adapters and caliper bracket spacers if needed. Everything is grade 8 hardware.
How to Choose the Right B17 Parts for Your Bike
Not all B17 kits are the same. Here’s what to consider when buying.
Full Kit vs. Individual Components
American Suspension sells a complete rear kit (shocks, compressor, tank, hardware) for around $1,200–$1,500. The front kit adds another $700–$900. If you’re on a budget, you can buy just the rear shocks and use a manual pump—but you won’t get the convenience of an on-board compressor. Most riders prefer the full kit because it’s plug-and-play.
Digital vs. Manual Air Management
Decide whether you want manual Schrader valves or a digital controller. Manual is cheaper and reliable, but you have to stop and pump every time you adjust. Digital controllers cost $300–$500 extra but let you adjust the air pressure from the saddle. For daily riders, the convenience is worth it. For show bikes, manual is fine.
Color and Finish Options
Shocks are available in chrome or black anodized. The compressor and tank are usually black. Some kits offer polished stainless steel tanks. Choose based on your bike’s overall look.
Compatibility with Factory Accessories
The B17 kit is designed for stock exhaust and side covers. But if you have aftermarket mufflers or a lowered seat, you may need different spacers or shorter shocks. Contact American Suspension with your mods before ordering.
Installation Overview and Tips
Installing a B17 system is a weekend job for a moderately skilled mechanic. Here’s a brief overview.
Tools You’ll Need
- Socket set (metric and SAE)
- Allen keys (hex and Torx)
- Air wrench or breaker bar for old shocks
- Wire cutters/strippers
- Heat gun (for air lines)
- Jack and lift stand
Step-by-Step Summary
- Remove the seat, side covers, and exhaust (only the right muffler needs to come off for rear shock access).
- Unbolt the stock rear shocks and remove them.
- Install the new B17 shocks with the provided brackets. Torque to specs (usually 45–50 ft-lbs).
- Mount the compressor and tank under the side cover or using the included bracket near the battery.
- Run air lines from the compressor/tank to each shock. A common routing path is along the inner frame rail, secured with zip ties.
- Connect the wiring harness to the battery and compressor. Add the relay and fuse.
- For front kit: Remove fork caps, drain oil, install inner struts, and reassemble. This is more involved and may require fork oil.
- Test the system: Fill to 100 PSI, check for leaks with soapy water, and adjust to desired ride height.
- Reinstall side covers and seat.
Pro Tip
When installing the air lines, cut the ends cleanly with razor blades, not scissors. Burrs can cause leaks. Use Teflon tape on all brass fittings.
Maintenance and Troubleshooting
Keep your B17 system in top shape with simple care.
- Check air pressure weekly: Leaks are rare but happen. If your bike sags overnight, tighten fittings or replace an O-ring.
- Drain the tank monthly: Open the drain valve to remove moisture. This prevents corrosion.
- Lubricate the compressor: A few drops of 20W oil in the intake every 6 months.
- Common issues: Noisy compressor? Check for loose mounts. Slow rise? Check for kinked air lines.
Comparing B17 to Other Air Suspension Brands
The B17 is American Suspension’s flagship, but it competes with Klock Werks Hawg Halters and RideTech. The B17 stands out for its direct fitment (no brackets needed) and lower price point. Hawg Halters have a longer warranty (5 years vs. 2 years). RideTech offers smoother digital controllers. For a budget-conscious rider, the B17 is the best value. If you want premium adjustability, consider an upgrade to the digital controller.
Final Recommendation
For most Harley Touring owners looking to improve handling and appearance, the American Suspension B17 rear kit with the optional front struts is the right choice. Start with the rear kit if funds are tight—it makes the biggest difference. Add the front later. Go with the manual system unless you ride daily and value convenience. Buy direct from American Suspension or through an authorized dealer to avoid knock-offs. With proper installation, the B17 parts will transform your bike into a smooth, low-slung cruiser that still corners well.
Remember to check your state’s laws on ride height modifications. Some states have minimum bumper height regulations, and lowering your bike too much could make it illegal. Always keep adjustability so you can raise it back to spec for safety and legality.