2021 Harley-Davidson FLTRXS Road Glide Special — Maintenance & Ownership Guide
Routine Maintenance
Key maintenance tasks to keep your 2021 Harley-Davidson FLTRXS Road Glide Special running reliably.
Oil Service
Requires 5.2 quarts of 20W-50 oil. Standard intervals are 1,000 miles for the first service, then every 5,000 miles.
Cable Clutch Adjustment
Unique to 2021+ models; the new cable system requires periodic manual adjustment at the primary and the inline adjuster to maintain proper freeplay.
Primary & Transmission Fluid
Separate sumps require specific fluids; the primary chaincase takes approximately 1.1 quarts and the transmission takes 1 quart.
Common Wear Items
Parts that wear over time on the 2021 Harley-Davidson FLTRXS Road Glide Special and should be inspected regularly.
Rear Tire
Heavy touring use and 114ci torque tend to wear the rear Dunlop Multi-Tread tire quickly, often needing replacement every 8,000-12,000 miles.
Brake Pads
Brembo pads provide excellent stopping power but the heavy weight of the FLTRXS leads to moderate wear on the dual front rotors.
Battery
High-compression 114 engine requires a strong 400+ CCA battery. The stock YTX30L-BS typically lasts 3-4 years.
Popular Upgrades
The most popular aftermarket upgrades for the 2021 Harley-Davidson FLTRXS Road Glide Special.
Stage 1 Performance
High-flow air intake and slip-on mufflers combined with a tuner to reduce engine heat and improve throttle response.
Rear Shocks
The stock 'Special' shocks have limited travel (2.1 inches); upgrading to 13-inch Legend or Ohlins shocks is the most common fix for ride quality.
Handlebars
Many riders find the stock bars too low; 12-inch or 14-inch 'Meathook' style apes are a frequent ergonomic upgrade.
Common Replacement Parts
Parts that commonly need replacing on the 2021 Harley-Davidson FLTRXS Road Glide Special.
Clutch Cable Adjuster
The stock plastic inline adjuster is a known weak point that can fail or feel 'mushy'; many owners replace it with a metal aftermarket unit.
Compensator
The M8 compensator can develop a rattle or 'clunk' over time, especially under heavy load or high mileage.
Used Buying Inspection Checklist
What to look for when buying a used 2021 Harley-Davidson FLTRXS Road Glide Special.
Clutch Engagement
Primary Noise
Oil Sumping Check
Infotainment Screen
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