Harley-Davidson historically offered co-branded tire series developed for cruiser (D401), touring (D402) and sport (K591) use. Each model emphasizes different construction, tread pattern and compound to match riding style: stability and straight-line comfort for cruisers, load-carrying and wet-weather stability for touring, and sharper handling for sport. Always confirm current OE approvals, exact sizes and the manufacturer's break-in recommendations before fitting replacements.

Overview

Harley-Davidson long partnered with tire makers (most notably Dunlop) to offer co-branded tires engineered for specific riding styles: cruiser, touring and sport. The classic Harley series - D401, D402 and K591 - were developed with distinct tread profiles, compounds and construction to match those roles.

D401 - Cruiser-focused design

The D401 is a cruiser/front-focused tire built for stability and predictable handling at typical Harley cruising speeds. It features a computer-optimized tread pattern and a compound tuned for wet and dry traction. Many D401s carry co-branding (Harley-Davidson on the sidewall) when supplied as original equipment on some Harley models.

Common attributes


  • Bias or bias-belted construction for stability


  • Tread pattern tuned for straight-line stability and predictable lean-in


  • Available in sizes for large-diameter front wheels (historically 19-inch fronts on many cruisers)1


D402 - Touring and load-carrying


The D402 is positioned for touring: a stable casing, reinforced construction for load carrying, and a tread profile designed to resist hydroplaning. Specific features historically listed for D402 include a multi-ply polyester casing and offset center groove to improve water evacuation and stability on wet surfaces.

You'll typically find D402 in front and rear sizes, and in whitewall or blackwall finishes for classic styling on touring bikes.2

K591 - Sport and performance intent

The K591 (sometimes called a sport or sport-touring tire) began as a racing-derived design and was refined for high-performance street use. It emphasizes sharper handling and grip for confident cornering, and many K591 variants have higher speed ratings (V or above) consistent with sport riding.3

Typical traits


  • Softer compound and more aggressive tread pattern than cruiser tires


  • Profiles tuned for faster transition and corner grip


  • Usually available only in blackwall finishes


Break-in and safety precautions


When you fit any new motorcycle tire, follow a controlled break-in period. Avoid sudden acceleration, hard cornering, and maximum-power braking for the initial miles to allow the factory mold-release residues to wear off and the compound to seat properly. The classic recommendation has been about 100 miles as a safe initial period, but check the tire maker's specific guidance for the model you install.4

Notes and next steps

These model summaries preserve the original product distinctions (cruiser, touring, sport). Tire offerings and OE approvals have changed over time, and some Harley models now ship with different tires or manufacturers. Before you buy or fit a replacement, confirm current OE approvals, exact available sizes, and the maker's installation/break-in recommendations for your bike and tire size.5
  1. Confirm whether D401, D402 and K591 remain current OE-approved models for any Harley-Davidson motorcycles and list which model years if applicable.
  2. Verify historical and current available sizes and sidewall options (blackwall, whitewall) for D401, D402 and K591.
  3. Confirm construction details (e.g., plies, fiberglass belts) and speed ratings for each model where stated.
  4. Verify the recommended initial break-in distance (commonly quoted as ~100 miles) from tire manufacturers for these specific models.

FAQs about Harley Tires

Are D401, D402 and K591 still the factory tires on modern Harleys?
Some older Harley models used these Dunlop-based series as OEM options, but factory fitments have changed over time. Confirm the current OE tire for your specific model year and trim with Harley-Davidson or the tire manufacturer before purchasing.
What’s the main difference between D401 and D402?
D401 targets cruiser-style stability and predictable handling; D402 emphasizes touring needs - higher load capacity and wet-weather stability thanks to a reinforced casing and tread design.
How long should I avoid aggressive riding after fitting new tires?
Manufacturers commonly recommend a controlled break-in period to allow mold-release compounds to wear off. A typical guideline has been around 100 miles, but you should follow the specific recommendation from the tire maker for the tire model you install.
Can I mix a K591 rear with a D401 front?
Mixing tire families can change handling characteristics. If you consider mixed fitment, consult the tire maker's compatibility guidance and a dealer to ensure the combination is safe for your bike and riding style.