Dedicated Subsystem WorkbenchPlatform Gen: 1994–2026

2023 Harley-Davidson Road King / Road King Special (FLHR / FLHRC / FLHRXS) Tire Sizes, Cold Pressures & Gearing Ratios

OEM tire sizes, front cold PSI (), rear cold PSI (), sprocket teeth count, final drive ratio, and chain pitch for 2023 Harley-Davidson Road King / Road King Special (FLHR / FLHRC / FLHRXS).

Technical PassportOEM VERIFIED

Engine

1868cc

Cooling

Air / Oil-Cooled with Rubber-Isolated Frame Mounts

Final Drive

Belt Drive

Engine Oil

4.70 L (5.00 US qt)

Spark Plug

H-D 6R10 / 6R12

Front Tire

130/60B19 61H (Special) / 130/80B17 65H (Standard)

Gen 1994–2026

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 1994 through 2026.

SPECS-TO-CART BUNDLESFactory Direct-Fit Maintenance Bundles Available

1-Click verified Motul engine oil service kits, race filters, spark plugs, and brake fluid pre-measured for this 2023 Harley-Davidson Road King / Road King Special (FLHR / FLHRC / FLHRXS).

Configure Service Bundles→

Select Model Year:(Active: 2023)
33 Production Years (1994–2026)

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026

Suggested Items3 Verified Workshop Consumables Available for this Job

View Suggested Items ↓

Tire Engineering & Multi-Scenario Pressure Matrix

ETRTO Validated

Inflation targets calibrated across operating modes, verified rim width ranges, and certified alternate sizes.

Shop Direct-Fit Tires

Multi-Scenario Inflation Pressures

Solo Street / CommutingCold Baseline

Front: Not Available

Rear: Not Available

Two-Up Passenger & LuggageMax Load

Front: Not Available

Rear: Not Available

Off-Highway / Terrain Pressure

Maintain OEM cold baseline for street transfers; adjust -2 to -4 PSI for loose terrain.

Rim Geometry & ETRTO Envelopes

Front Wheel

OEM Rim Width:Not Available

Permissible Envelope:Not Available

Rear Wheel

OEM Rim Width:Not Available

Permissible Envelope:Not Available

Operating outside ETRTO envelope width alters crown radius, accelerates shoulder wear, and impacts lean stability.

Factory Dimensions & Verified Alternates

Factory Standard Sizes

Front:130/60B19 61H (Special) / 130/80B17 65H (Standard)

Rear:180/55B18 80H (Special) / 180/65B16 81H (Standard)

Shop In-Stock Matched 2-Tire Sets→

Verified Alternate Fitments

Factory standard sizing recommended.

Alternate profiles verified for swingarm, chain guard, and fender clearances.

Final Drive Gearing & Speed/RPM Calculator

Belt Drive

Factory reduction ratios, interactive sprocket gearing simulator, 6th gear cruising RPM matrix, and swingarm chain adjustment tolerances.

Launch Full Gearing Simulator Shop Drive Belts

Drive Architecture

Poly-Chain Carbon Belt

OEM Pulleys

29T Transmission / 68T Wheel

OEM Final Ratio

2.345 : 1

Belt Teeth & Width

140-Tooth Carbon-Fiber Reinforced (24mm width)T • 

Cold Tension Deflection

Quick Gearing Presets

Front Transmission PulleyStock: 29T

29 Teeth

Factory teeth count

Rear Wheel Belt PulleyStock: 68T

68 Teeth

Factory teeth count

Drive Ratio & Torque Impact

Calculated Final RatioStock: 2.345

2.345 : 1

Drivetrain Torque Delta

OEM Factory Baseline Dynamics

Balanced all-around factory engineering calibrated for EPA emissions and street usability.

Countershaft Speedo Variance:0.0%

Speedometer reads true to factory calibration standards.

Cruising Engine RPM in 6th Gear

60 MPH

Stock: 2,844 RPM

2,844 RPM

70 MPH

Stock: 3,319 RPM

3,319 RPM

80 MPH

Stock: 3,793 RPM

3,793 RPM

Calculated using factory 6th gear ratio (0.923), primary reduction (1.681), and 180/55B18 80H (Special) / 180/65B16 81H (Standard) rolling circumference.

Belt Tension & Deflection Spec

Cold Deflection Tolerance

Check tension using a 10-lb belt tension gauge at the lower belt run midpoint window on the side stand.

Belt Architecture

140-Tooth Carbon-Fiber Reinforced (24mm width)T • 

Recommended Belt:

Shop Belt Tension Gauges Find Direct-Fit Gearing Sets

Factory Chassis Geometry

Chassis Alignment, Drive Tension & Rear Axle Calibration

Precision workshop alignment tools, dynamic drive tension tolerances, and axle spindle calibration for the 2023 Harley-Davidson Road King / Road King Special (FLHR / FLHRC / FLHRXS).

Belt Drive Architecture

Secondary Belt Deflection & 10-lb Tension Calibration

FACTORY BELT DEFLECTION SPEC:

Measure cold deflection with a spring-loaded belt tension tool applying exactly 10 lbs (4.5 kg) of upward force at the lower belt run inspection window on jiffy stand.

CARBON BELT TOOTH & FLANGE INSPECTION:

140-Tooth Carbon-Fiber Reinforced (24mm width)T • 

Inspect polyurethane cog teeth for stone gouges or embedded gravel. Verify rear pulley chrome flanges show even belt tracking without edge fraying.

Official NHTSA Safety Recalls & Technical Bulletins

3 Active Campaigns

U.S. Department of Transportation compliance database (Title 49 U.S.C. Chapter 301).

Verify VIN on NHTSA.gov

The U.S. National Highway Traffic Safety Administration reports 3 safety recall campaigns associated with this platform. Independent repair shops and riders should confirm that authorized dealership warranty remedies have been applied.

NHTSA #18V734000POWER TRAIN:CLUTCH ASSEMBLY

▼

Defect Description

Harley Safety Recall 0173: Secondary clutch actuator piston seal tear on 2017–2018 Road King and Road King Special models.

Safety Hazard / Consequence

Clutch disengagement failure when stopped in gear creates unintended motion hazard.

Factory Remedy & Repair Action

Dealers install upgraded secondary clutch actuator assembly (Kit #91500093).

NHTSA #16V471000POWER TRAIN:CLUTCH ASSEMBLY

▼

NHTSA #18V076000SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ABS

▼

OEM Workshop Archives

Official Factory Service Bulletins & Field Updates

3 Documented Bulletins

Bulletin #HD-0173Safety Recall Bulletin 0173 / NHTSA 18V-734: Touring & Softail Secondary Hydraulic Clutch Actuator Piston Assembly (Kit #91500093)

Source: RCMN-18V734-8825.pdf

Mandated Torques:Torque: 10–12 N·m (88–106 in-lb) (Transmission Side Cover Bolts - Cross Pattern)Torque: 26–30 N·m (19–22 lb-ft) (Hydraulic Clutch Line Banjo Bolt)Torque: 10–12 N·m (88–106 in-lb) (Secondary Actuator Bleeder Screw)

Consumable Specs:Harley-Davidson DOT 4 Platinum Brake FluidTransmission Side Cover Gasket

Genuine Part Numbers:9150009337200131A25700445

Bulletin #HD-0169Safety Recall Bulletin 0169 / NHTSA 16V-471: Hydraulic Clutch Master Cylinder Disengagement Inspection & Seal Flush

Source: RCRIT-16V471-6645.pdf

Mandated Torques:Torque: 8.0–10.2 N·m (70–90 in-lb) (Handlebar Clutch Master Cylinder Clamp Screws)Torque: 26–30 N·m (19–22 lb-ft) (Clutch Master Banjo Bolt)

Consumable Specs:Harley-Davidson DOT 4 Platinum Hydraulic FluidPurge Tubing & Catch Bottle

Genuine Part Numbers:37200025C41800041

Recalls 0169 & 0173 • NHTSA 16V-471 & 18V-734

Harley-Davidson Road King & Touring Secondary Hydraulic Clutch Actuator Architecture

Secondary clutch actuator cylinder piston seal inspection, DOT 4 Platinum purge, and transmission side cover torque.

Hydraulic Banjo Bolt26–30 N·m (19–22 lb-ft)

Actuator Bleeder Screw10–12 N·m (88–106 in-lb)

Side Cover Screws10–12 N·m (Cross Pattern)

Mandated Hydraulic FluidHarley DOT 4 Platinum

Bulletin #HD-0171Safety Recall Bulletin 0171 / NHTSA 18V-076: VRSC V-Rod & Touring ABS Hydraulic Control Unit (HCU) Valve Solenoid Flush

Source: RCRIT-18V076-3366.pdf

Mandated Torques:Torque: 26–30 N·m (19–22 lb-ft) (Front & Rear Master Cylinder Banjo Bolts)Torque: 10–12 N·m (88–106 in-lb) (Caliper Bleeder Screws)Torque: 38–52 N·m (28–38 lb-ft) (Front Caliper Mount Bolts)

Consumable Specs:Harley-Davidson DOT 4 Platinum Brake Fluid (Part #99953-99)Moisture Tester / Boiling Point Analyzer (< 3% moisture limit)

Genuine Part Numbers:99953-9942865-06B41800041