If your Harley-Davidson Touring model squats noticeably when a passenger climbs on, or floats uncomfortably over highway expansion joints, the fix costs nothing but five minutes and a hand pump. Most riders never adjust their rear air shocks. Our research across HDForums and r/Harley shows that factory-shipped bikes sit at near-zero psi in the rear shocks – fine for a lightweight solo rider, but completely wrong for anything else.
This guide covers every step: locating the Schrader valve, setting the right pressure for your load (per the official Harley-Davidson Service Manual tables), the correct tool to use, and when to suspect something is actually wrong with the shock itself.
Which Harley Models Have Factory Air Shocks
Not every Harley leaves the factory with air-adjustable rear suspension. Knowing which platform you have determines everything that follows.
Factory rear air suspension has been standard on Harley-Davidson Touring models since 1984. This covers the following platforms through the 2016 model year and beyond (with Milwaukee-Eight variants from 2017+ retaining the same system on most CVO and touring trim lines):
- FLHR / FLHRC – Road King, Road King Classic
- FLHX – Street Glide
- FLTR / FLTRU – Road Glide, Road Glide Ultra
- FLHT / FLHTC / FLHTCU / FLHTK – Electra Glide Standard, Classic, Ultra Classic, Limited
- FLHXS / FLHXSE – Street Glide Special, CVO Street Glide
- FLTRXSE – CVO Road Glide Ultra
Models that do NOT have factory air shocks: Sportster (all years), Dyna (requires aftermarket kit), Softail (uses a hidden monoshock or coil-over – see our separate guide on adjusting rear shocks on a Harley-Davidson Dyna).
Tools You Will Need
You don’t need a full workshop for this. Most of what’s required is inexpensive, and one tool is already in your garage if you’ve done any suspension work.
- Low-pressure shock pump with gauge (0-60 PSI range) – mandatory. Standard bicycle floor pumps top out at the right pressure range but lack an accurate low-pressure gauge. Automotive tire inflators are NOT suitable – they make precise adjustments at 5-10 psi nearly impossible.
- Valve cap removal tool or flathead screwdriver – to remove the protective cap from the Schrader valve
- Nitrile gloves (optional) – air lines occasionally release a small amount of lubricant when disconnected
- HD-34633A Air Suspension Pump and Gauge (Harley part number) – this is the OEM tool specified in the service manual for this exact procedure
Per the HD Service Manual (2009 Touring, p. 1-45): “Use a no-loss air gauge to check air pressure. Check pressure in shocks weekly if in daily use or before each trip if only used occasionally.” A no-loss gauge keeps a small amount of air trapped when you remove it from the valve – standard automotive tire gauges bleed pressure as you remove them, giving you a false-low reading.
Recommended Air Shock Pumps
The right pump makes this process repeatable. Generic compressors and tire inflators give you no control in the 5-30 psi range where most of your adjustments will happen.
0-60 PSI range purpose-built for motorcycle air shocks. No-loss valve head. Forum-recommended as direct equivalent to the HD-34633A at a lower price point.
Check on Amazon
Precision gauge with bleed button. Works across the full 0-50 psi Harley range with accurate readout. Popular with riders who fine-tune pressure at every fuel stop on long tours.
Check on Amazon
300 PSI max but works accurately in the 0-50 psi range needed for Harley air shocks. Solid build at an entry price. Good secondary tool to keep in a saddlebag for road trips.
Check on AmazonWhere Is the Air Valve on a Harley-Davidson
This is the step that stops most people. The valve is not where you might expect it, and its location differs slightly between platforms.
Per the HD Service Manual (2009 Touring, p. 1-45): “Adjust the rear air suspension pressure by adding or removing air from the air valve located near the upper shock absorber mount on the left side of the motorcycle.”
On most Touring models (2004-2016+), the air valve assembly routes through the left saddlebag area. To access it:
- Remove the left saddlebag (two latches, no tools required on most models)
- Look at the left shock absorber, near the top mount
- You will see a small compression-fitting air tube that leads to a Schrader valve with a protective rubber cap
- The cap threads off counterclockwise
On some Road King and Street Glide models, the valve is accessible through a small grommet in the saddlebag mount without fully removing the bag. On FLHT/C/U Electra Glide models with hard tour paks, you may need to remove the left saddlebag fully to get a straight shot at the valve fitting.
Step-by-Step: How to Adjust Air Shocks on Harley-Davidson
Follow these steps in order. This procedure takes about five minutes and does not require lifting the bike or removing any fasteners beyond the saddlebag latch.
- Park on a level surface and put the bike on the jiffy stand. Per the HD Service Manual (2009 Touring, p. 1-45): “Always adjust pressures with the motorcycle on the jiffy stand.” Adjusting with the bike on the center stand or fully upright changes the shock extension and gives an inaccurate baseline.
- Determine your load configuration before touching the valve. Are you riding solo at your weight? Solo with luggage? Two-up? The target pressure is different for each scenario. Decide now, before you add or release air, so you’re adjusting to a specific target – not just “more or less.”
- Remove the left saddlebag to access the air valve. On most Touring models this takes 15 seconds – release the two cam locks and lift the bag off.
- Locate the Schrader valve near the upper left shock mount. It will have a black or grey rubber dust cap. Thread the cap off counterclockwise and set it somewhere safe.
- Check current pressure. Attach your pump’s chuck to the Schrader valve and read the gauge before adding any air. This tells you your baseline and confirms the valve is sealing properly. If the gauge instantly reads near zero and stays there after you disconnect, the shocks may have bled down since last adjustment – that’s normal if the bike has been sitting.
- Look up your target pressure in the table below for your load scenario. Find your total rider weight row and read the recommended psi range.
- Add air in small increments (5 psi at a time) using the hand pump. Do not use a compressor – they deliver air too fast to control in the 5-30 psi range, and overshooting requires bleeding air back down, which releases a small amount of lubricant from the shock. The service manual specifies a no-loss gauge pump specifically to avoid this.
- If you need to release air, press the small pin in the center of the Schrader valve with a pen tip or the bleed button on your pump. Release in very small bursts – air comes out fast.
- Recheck the gauge after each pump stroke. The gauge reading on a hand pump is accurate while still attached – it drops slightly when you remove the chuck due to micro-bleed. Account for 1-2 psi of loss when disconnecting if your pump is not a “no-loss” type.
- Replace the dust cap hand-tight. Do not overtighten – the cap is plastic on most models and the threads strip easily. Snug is enough.
- Reinstall the left saddlebag.
- Test ride. If the rear feels planted and controlled over bumps, you’re dialed in. If it still feels harsh and bouncy, drop 5 psi. If it still sags under your weight, add 5 psi and re-test.
Correct Air Pressure by Load (Official Harley Service Manual Tables)
These are the pressure ranges directly from the Harley-Davidson 2009 Touring Service Manual (Tables 1-14 and 1-15, pp. 1-44 to 1-45). The tables differ between the Road King / Street Glide / Road Glide family (FLHR/C, FLTR, FLHX) and the Electra Glide / Ultra Classic family (FLHT/C/U). Check which platform you have before setting pressure.
Road King, Street Glide, Road Glide (FLHR/C, FLHX, FLTR)
| Load Scenario | Total Rider Weight (lbs) | Recommended Pressure (PSI) |
|---|---|---|
| Solo rider | Under 150 lbs | 0 psi |
| Solo rider | 150-200 lbs | 0-10 psi |
| Solo rider | 200-250 lbs | 10-20 psi |
| Solo rider | 250-300 lbs | 20-30 psi |
| Solo rider | Over 300 lbs | 30-50 psi |
| Solo + 40 lbs luggage | Under 150 lbs | 10-20 psi |
| Solo + 40 lbs luggage | 150-200 lbs | 20-30 psi |
| Solo + 40 lbs luggage | 200-250 lbs | 30-40 psi |
| Solo + 40 lbs luggage | Over 300 lbs | 50 psi (max) |
| Rider plus passenger | All | 40-50 psi |
| Maximum GVWR | All | 50 psi (max) |
Electra Glide, Ultra Classic, Road Glide Ultra (FLHT/C/U, FLTRU)
| Load Scenario | Total Rider Weight (lbs) | Recommended Pressure (PSI) |
|---|---|---|
| Solo rider | Under 150 lbs | 5-10 psi |
| Solo rider | 150-200 lbs | 10-20 psi |
| Solo rider | 200-250 lbs | 20-30 psi |
| Solo rider | 250-300 lbs | 30-40 psi |
| Solo rider | Over 300 lbs | 40-50 psi |
| Solo + 70 lbs luggage | Under 150 lbs | 25-30 psi |
| Solo + 70 lbs luggage | 150-200 lbs | 30-40 psi |
| Solo + 70 lbs luggage | 200-250 lbs | 40-50 psi |
| Solo + 70 lbs luggage | Over 250 lbs | 50 psi (max) |
| Rider plus passenger | All | 50 psi (max) |
| Maximum GVWR | All | 50 psi (max) |
Source: HD Service Manual, 2009 Touring Models, Tables 1-14 and 1-15, pp. 1-44 to 1-45. Note: If a P&A Tour-Pak is installed, add 5-10 psi to the applicable base pressure. Never exceed 50 psi under any load configuration.
The 2011 Touring Service Manual (Table 1-15) carries identical pressure ranges for FLHTC, FLHTCU, FLHTK, and FLTRU, confirming these specs were consistent across the 2009-2011 Touring generation. For Milwaukee-Eight (2017+) models, Harley-Davidson’s owner portal confirms the same 0-50 psi limit applies, though exact per-weight ranges should be confirmed in your model-year owner’s manual.
Adjusting for a Tour-Pak or Heavy Luggage
Adding a Tour-Pak – or filling both hard saddlebags with gear – changes your calculation significantly. This is the scenario most riders get wrong.
Per the HD Service Manual: if a P&A Tour-Pak is installed, add 5-10 psi to the base shock pressure derived from your load table. So a 200-lb solo rider on a Road King would normally target 10-20 psi – with a Tour-Pak loaded to 20 lbs, that rider should target 15-25 psi instead.
Our research found consistent reports on HDForums of riders loading full Tour-Paks and saddlebags (combined 30-50+ lbs) without adjusting shocks, which produces the characteristic “boat deck” rear-end wallow described by many long-distance Touring riders. The fix is a simple pressure bump before leaving the hotel parking lot. See our full Harley-Davidson Tour-Pak guide for luggage weight estimates by model.
Checking Rear Suspension Sag
Pressure numbers are a starting point. Sag measurement tells you whether those numbers are actually working for your specific setup.
To measure static sag on a Touring model:
- Measure the rear ride height with the bike unloaded on the jiffy stand (point A: fender lip to axle centerline)
- Have the rider sit in riding position with both feet up (side stand up, bike vertical). Measure again (point B)
- Static sag = A minus B. A typical Touring setup targets 25-35mm of static sag with a solo rider. Less than 20mm means the shocks are overinflated for that load. More than 40mm means they need more air.
For a two-up setup, both rider and passenger should be seated and in normal riding position for the sag measurement. Two-up sag targets are similar (25-35mm) but you’ll need a helper to hold the bike vertical while you measure.
Our research across suspension tuning threads on r/Harley and HDForums found that riders who check sag (rather than relying purely on pressure numbers) report better long-distance comfort consistency because it accounts for shock wear, ambient temperature, and altitude differences that affect the air volume in the shocks.
Air Shock Troubleshooting
Most problems people attribute to suspension settings are actually one of three conditions – and two of them need a mechanic, not a pump.
Shocks lose pressure overnight
Per the HD Service Manual (2009 Touring, p. 2-22), a loss of 5-10 psi overnight after a fresh pump-up is within normal range for air suspension. The shocks share a single air circuit through compression-fitting air lines. If you lose more than 10 psi in 24 hours after a fresh pump, follow the shop leak-check procedure: pressurize to 30 psi, wait overnight, recheck. If loss exceeds 10 psi, inspect the air tube fitting at the shock absorber first – these plastic compression fittings are a known failure point and can be replaced for a few dollars without removing the shock.
Bike still sags even at 50 psi
If the rear continues to sag even after setting maximum allowable pressure, the shocks have likely lost significant oil through normal wear. Per the service manual: “Air shocks are not repairable. Replace the shocks if damaged, worn or any sign of leakage is observed.” This is a shop visit. Aftermarket options (including progressive-rate air-over-oil units) are covered in our best shocks for Harley Touring guide.
Ride is harsh and choppy at correct pressure
If you’re running accurate pressure but the ride quality is still poor, the most common cause on higher-mileage Touring models is oil depletion inside the shock. Factory air shocks on Touring models are an air-over-oil design – the air sets the load, but the oil damping controls rebound. As the oil depletes, the shock loses damping capacity and the ride becomes harsh even at textbook air pressure settings. If you are also investigating rough idle or power loss alongside harsh ride quality, a cylinder leak-down test on a Twin Cam engine can confirm whether internal wear – not suspension – is the root cause. Again, not repairable – replacement is the fix. Consider upgrading to adjustable aftermarket units if the stock system has logged significant mileage. Our best air ride for Harley Touring guide covers direct-fit replacements and upgrades.
Valve leaks when pump is connected
If you hear air leaking from the valve-pump junction while inflating, the pump chuck is not fully seated on the Schrader valve. Push the chuck straight down with firm pressure before pumping. If leaking continues after proper seating, the Schrader valve core inside the fitting may be worn. A standard automotive Schrader valve core fits and can be replaced with a valve core tool for under $5.
Aftermarket Air Suspension Options
Factory air shocks on older Touring models (pre-2010 especially) have limited travel and minimal damping adjustability. Riders who want more than the factory system provides have several upgrade paths.
The two most common upgrades our research found discussed across Harley forums are Progressive Suspension 412 Series units and Arnott air suspension systems. Both retain air-adjustability while adding improved damping. The Arnott system in particular moves to a fully independent air bag design, separating the spring function from the damping entirely – which allows much finer pressure adjustment without affecting damping characteristics. We cover fitment, pricing, and forum consensus in our best air ride for Harley Touring motorcycles guide.
For riders dealing with stock Sportster suspension (which uses non-air coil-over shocks), see our separate guide on best shocks for Harley-Davidson Sportster.
Tire Pressure vs. Shock Pressure
This is a common source of confusion. Adjusting air shocks and adjusting tire pressure are two completely separate procedures. Both affect ride quality, and both need to be correct simultaneously.
Harley-Davidson Touring models specify different tire pressures for solo and two-up operation, similar to shock pressure. Underinflated rear tires create a soft, floaty sensation that riders sometimes misdiagnose as “shocks need more air” – only to find that inflating the shocks further makes the ride harsher without fixing the underlying issue. See our Harley-Davidson tire pressure chart for model-specific specifications. While the saddlebag is off and the bike is up, it is also a practical time to change worn handlebar grips – a 30-minute job that shares the same service window.
Frequently Asked Questions
How much air should I put in Harley air shocks?
The correct pressure depends on your specific load. Per the Harley-Davidson Service Manual (2009 Touring), a solo rider weighing 150-200 lbs on a Road King or Street Glide should run 0-10 psi. The same rider on an Electra Glide Ultra should run 10-20 psi. A rider-plus-passenger combination on any Touring model targets 40-50 psi. Never exceed 50 psi under any load configuration. The tables earlier in this article give the full breakdown by model family and weight range.
Can I use a bicycle pump to adjust Harley air shocks?
A standard floor bicycle pump will physically work on the Schrader valve, but its gauge is calibrated for 60-100+ psi tire pressures and will be extremely inaccurate at the 5-30 psi range used for shock adjustment. A dedicated shock pump with a gauge calibrated to 0-60 psi is much more accurate and gives you readable increments at the pressures that actually matter.
Where is the air valve on a Harley-Davidson Touring motorcycle?
On all Harley-Davidson Touring models (Road King, Street Glide, Electra Glide, Road Glide), the air valve is on the left side of the motorcycle near the upper rear shock mount. It is accessible after removing the left saddlebag. Per the official service manual, the valve connects to both rear shocks via a shared compression-fitting air line, so one valve location adjusts both shocks simultaneously.
How often should I check Harley air shock pressure?
The Harley-Davidson Service Manual recommends checking air pressure weekly if you ride daily, or before each trip if the bike sits between rides. Temperature affects air pressure significantly – a shock set to 25 psi at 70°F can drop to 20 psi at 32°F. Long-distance touring riders in our research typically check and adjust at each fuel stop when making multi-day trips with varying loads.
What happens if I put too much air in Harley shocks?
Overinflating beyond your load-appropriate pressure range makes the ride noticeably harsher, especially on rough pavement. Overinflating beyond the 50 psi maximum risks damage to the shock internals and seals, and can affect rear suspension travel – reducing the shock’s ability to absorb large impacts. If you’ve accidentally overinflated, release air using the bleed valve on your pump or by pressing the pin in the center of the Schrader valve.
Do Harley air shocks need to be at the same pressure on both sides?
On Harley-Davidson Touring models, both rear air shocks share a single pneumatic circuit connected by a common air line. This means they always equalize to the same pressure automatically when you inflate through the single valve on the left side. There is no separate right-side valve on factory Touring suspension. If your two shocks appear to be at different pressures or ride heights, that indicates a leak in the interconnecting air line or a failed shock – not a need for independent adjustment.
Can I upgrade my Harley Touring shocks to a better air suspension system?
Yes. The most popular direct-fit upgrades for Harley Touring models are Progressive Suspension 412 series, Arnott air suspension, and Öhlins adjustable units. Each retains air adjustability while improving damping quality over the stock system. Fitment varies by model year and trim. Our detailed comparison is in the best air ride for Harley Touring motorcycles article.
Is adjusting Harley air shocks something I can do myself?
Yes – this is one of the most accessible maintenance tasks on a Harley-Davidson Touring model. It requires no mechanical skill, no tools beyond a shock pump, and takes about five minutes. The only part that trips people up is locating the air valve (left side, remove saddlebag) and understanding that correct pressure is load-dependent, not a fixed single number. Using the tables from the service manual eliminates the guesswork.
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