2024 Peterbilt 389 — Wiper Blade Sizes

Quick reference

Note: Most 2024 Peterbilt 389 builds use 22 inch blades on both sides. Some fleets may see different arm/adapter specs from the factory or aftermarket arms. Always confirm your arm type (hook vs. side pin vs. bayonet) before purchase.

Best aftermarket replacements

These popular beam-style options are widely available in 22 inch and offer good performance. Choose the correct connector/adapter to match your wiper arm.

• Bosch ICON (premium $$$): Excellent longevity and all-weather wipe. Commonly supplied for J-hook; side-pin adapters may be required/packaged depending on SKU.
• Rain-X Latitude Water Repellency (mid-high $$): Smooth, quiet, and applies water-repellent coating. Ensure the connector kit suits your arm style.
• Trico Force (mid $$): Aerodynamic beam blade with solid winter performance; available with multi-adapter kits and heavy-duty variants.
• Michelin Stealth Ultra (mid $$): Hybrid design combining frame and beam stability; confirm adapter for side-pin or hook arms.
• PIAA Si-Tech (premium $$–$$$): Silicone insert lays a water-repellent layer and lasts long; verify connector compatibility with your arm.

If your 389 uses a heavy-duty side-pin or bayonet arm, look for blades or adapter kits specifically labeled for 1/4 in side pin, 3/16 in side pin, or bayonet fittings. Many fleet/HD lines from these brands offer the needed adapters.

Attachment style

The Peterbilt 389 commonly uses one of the following:

• J-hook: The arm ends in a U-shaped hook (often 9x3 mm or 12x4 mm). Most consumer beam blades fit this with no extra hardware.
• Side pin (heavy-duty): A round pin (commonly 1/4 in or 3/16 in) passes through the blade saddle. You’ll need a blade or adapter that locks over the pin.
• Bayonet: A flat, blade-like arm tip that slides into a matching slot on the wiper. Less common but seen on some HD arms.

Match the adapter in the blade box to your arm. If you’re unsure, bring the old blade to the parts counter to identify the connector.

How to install

1. Park safely and switch off wipers. Lift the arm gently from the glass.
2. Identify the connector: J-hook, side pin, or bayonet.
3. Remove the old blade:
   • J-hook: Press the tab and slide the blade down to unhook.
   • Side pin: Depress the locking clip and slide the blade off the pin.
   • Bayonet: Press the release and pull straight off.
4. Select the correct adapter from the new blade kit (if needed) and attach it to the blade.
5. Slide the new blade onto the arm until it clicks/locks firmly.
6. Lower the arm carefully to avoid snapping onto the windshield.
7. Test on a wet windshield to confirm smooth, quiet operation.

Unusual HD adapters: Some side-pin saddles use set screws or locking caps. If yours does, reuse the cap/screw and torque lightly—just snug enough to secure.

When to replace

• Time: Every 6–12 months in most climates; sooner with heavy use or severe weather.
• Symptoms: Streaking, chattering, skipping, squeaking, split edges, or areas left unwiped.
• Visual cues: Hardened, cracked, or torn rubber; bent frame/adapters.

Replacing promptly preserves visibility, reduces driver fatigue, and protects the windshield from chatter-induced wear.

Need wipers swapped fast? Find a shop on Repairius.