Harley-Davidson Low Rider ST (FXLRST Milwaukee-Eight 117) — OEM Fluid, Tire Pressure & Maintenance Specs
1,923cc Air/Oil-Cooled 45° V-Twin Milwaukee-Eight 117 Club-Style Performance Bagger · Source: Harley-Davidson Softail Models (FXLRST Low Rider ST) Official Owner’s Manual
According to the Harley-Davidson Softail Models (FXLRST Low Rider ST) Official Owner’s Manual, the 2022–Present Harley-Davidson Low Rider ST (FXLRST Milwaukee-Eight 117) (chassis FXLRST (ST)/FXLRS (Low Rider S)) requires 4.3 L (4.54 US qt) of SAE 20W-50 (JASO MA2, Screamin’ Eagle SYN3 20W-50 / H-D 360 SAE 20W-50) engine oil for a drain-only change and 4.7 L (4.97 US qt) with filter service (HD 62700296 (Black) / 62700297 (Chrome) / HF171B). Standard solo cold tire pressure is 207 kPa / 2.07 bar / 30 PSI front (110/90B19 62H) and 262 kPa / 2.62 bar / 38 PSI rear (180/70B16 77H), paired with 4× HD 6R10 (31600012 — Dual-Plug M8 Heads) spark plug(s) and a HD 65989-97E / YTX20HL-BS battery.
Drain only: 4.3 L (4.54 US qt)
R 262 kPa (2.62 bar)
Est. Range: ~336 km (209 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 20W-50 · JASO MA2 · Screamin’ Eagle SYN3 20W-50 / H-D 360 SAE 20W-50 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 4.3 L (4.54 US qt) • With filter/strainer: 4.7 L (4.97 US qt) • Complete dry overhaul: 5 L (5.28 US qt) |
| OEM Oil Filter Code & Type | HD 62700296 (Black) / 62700297 (Chrome) / HF171B |
| Correct Oil Level Check Method | At full operating temperature resting ON THE SIDESTAND (Jiffy Stand); thread dipstick in to read |
| Oil Drain Bolt Torque | 24 N·m (17.7 lb-ft / 2.45 kgf·m) — Use fresh crush washer |
| Primary Chaincase Fluid | 1065 ml (1.06 L) — H-D Formula+ Primary & Transmission Fluid (1,065 ml / 36 fl oz wet refill) |
| Separate Transmission / Gearbox Oil | 828 ml (0.83 L) — H-D Formula+ or Heavy Synthetic Gear Oil 80W-140 (828 ml / 28 fl oz refill) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 110/90B19 62H · Rear: 180/70B16 77H (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 207 kPa / 2.07 bar / 30 PSI Rear: 262 kPa / 2.62 bar / 38 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 207 kPa / 2.07 bar / 30 PSI Rear: 276 kPa / 2.76 bar / 40 PSI |
| OEM Spark Plug & Quantity | HD 6R10 (31600012 — Dual-Plug M8 Heads) × 4 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | HD 65989-97E / YTX20HL-BS (12V 17.5Ah High-Output AGM) |
| Final Drive Maintenance | Harley-Davidson Heavy-Duty Carbon Belt — Tall-shock Softail geometry |
| Brake Fluid & Coolant | DOT 4 · Air/Oil-Cooled Milwaukee-Eight 117 (No coolant — downtube oil cooler) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 1923 cc · 105 hp @ 5,020 rpm · 168 N·m (123.9 lb-ft) @ 3,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 715 mm (28.1 in) · 327 kg (721 lbs) |
| Fuel Tank & Est. Real-World Range | 18.9 L (5.0 US gal) · ~17.8 km/L → ~336 km (209 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,600 km • Engine Oil / Filter: 8,000 km / 8,000 km • Air Filter / Spark Plug: 24,000 km / 48,000 km • Valve Clearance Check: 48,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Inspired by the classic FXRT, the 2022+ Low Rider ST (FXLRST) pairs a frame-mounted fairing and quick-detach clamshell bags (53.8 L) with the exact 43mm inverted fork, dual front discs, tall rear monoshock (31.3° lean), and M8 117 drivetrain of the Low Rider S (FXLRS).
Oil & Clutch Mechanical Engineering Note
Running the high-output M8 117 3-Hole system (~4.5–4.7 L SAE 20W-50 engine, 1,065 ml Formula+ primary, 828 ml gearbox), riders who push the FXLRST hard in canyon twisties often upgrade the isolated 6-speed gearbox to full-synthetic 75W-140 / 80W-140 gear oil for crisper hot shifts.
Garage Wrenching Gotchas
- Do NOT inflate like a wide-tire Breakout—the Low Rider ST’s nimble
110/90B19front and180/70B16rear specify 30 PSI (207 kPa) front and 38 PSI (262 kPa) rear cold (40 PSI loaded). - Both clamshell hard saddlebags release completely in seconds via internal quick-detach levers, giving wide-open access to the rear axle, belt tensioner, and brake caliper.
5. Frequently Asked Questions (FAQ)
How does the Low Rider ST differ mechanically from a Street Glide touring bagger?
Built on the performance Softail chassis rather than the heavier Touring frame, the Low Rider ST weighs 41 kg less (327 kg vs 368 kg), uses 43mm inverted forks, a frame-mounted fairing that takes weight off the bars, and achieves 31.3° of lean.
What are the 3-Hole oil capacities for the Harley-Davidson Low Rider ST?
Engine with black spin-on filter (62700296 / HF171B): ~4.5–4.7 L of SAE 20W-50; Primary: 1,065 ml (36 fl oz) of Formula+; Transmission: 828 ml (28 fl oz).
What is the factory cold tire pressure on the Low Rider ST and Low Rider S?
Set 30 PSI (207 kPa) front and 38 PSI (262 kPa) rear solo cold, or 40 PSI (276 kPa) rear under full luggage/passenger load.