Fits: 16"–17" Wheels | 8-Hole Pattern | 6.5" Bolt Circle | 5/8" Studs
Stop the "trailer bounce" that damages your suspension and cargo. The Centramatic 300-318D provides a permanent, on-board balancing solution for heavy-duty tandem axle trailers. These units balance the entire wheel assembly in real-time, ensuring your tires wear evenly and your trailer pulls straight.
Model #: 300-318D
Vehicle Type: Tandem Axle Trailers (Flatbeds, Toy Haulers, Horse Trailers)
Quantity: Set of 4 (Covers both axles)
Wheel Size: 16 in. to 17 in.
Bolt Pattern: 8-Hole
Bolt Circle: 6.5 in.
Stud Size: Designed for 5/8" studs
⚠️ Fitment Note: Due to variances between trailer models, these may not fit all applications. Please verify hub and brake drum clearance before installation.
Centramatic's patented technology uses a permanently sealed ring filled with hardened durametal alloy and proprietary synthetic fluid. As you tow, centrifugal force automatically shifts this media to the exact opposite of heavy spots.
Protect Your Investment: Dramatically reduces road vibration, preventing loose rivets, broken welds, and appliance failure in RVs.
Maximum Tire Life: Proven to increase tire longevity by 25%–50%—a major saving for expensive Load Range G or H trailer tires.
Lower Operating Temps: Keeps tires 8%–10% cooler, which is critical for preventing blowouts during long-distance hauling in high heat.
Self-Adjusting: Automatically compensates for "flat spots" from long-term storage or mud and debris stuck in the rims.
Maintenance-Free: A sealed, self-contained system with zero upkeep required—just install and tow.
Easy Setup: No pre-balancing needed. These mount directly behind the wheel on the hub using your existing 5/8" studs.
Speed Activated: The balancing media shifts into the correct position at ~20–22 mph.
Made in the USA: Built in Texas and backed by a 5-Year / Unlimited Mileage Warranty.
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