Attwood SP-400-RB Adjustable Transom Saver 23 to 35 in - Transom

In this review the Attwood SP-400-RB Adjustable Transom Saver is evaluated as a practical, no-nonsense solution for trailering boats with outboard motors up to 100 HP. It is aimed at boat owners who routinely haul their boat on trailers and need a way to support the cantilevered engine during transport. The single biggest reason to buy is its straightforward support system: a composite head that cradles the motor and an adjustable shaft from 23 to 35 in that lets you set firm contact between the engine and trailer to reduce stress on the transom.

Key Features

• Adjustable length: The 23 to 35 in adjustment range lets users set a snug fit for varied boat transom-to-trailer dimensions, reducing movement while towing.
• Composite head: The composite head securely holds the engine without metal-on-metal contact, helping protect the motor housing during transport.
• Mounting options: Comes with a choice of roller bracket or trailer mount bracket to attach the saver at the trailer end for versatile installation.
• Designed for up to 100 HP: Engineered for motors 100 HP and under, giving clear guidance for compatible outboards and avoiding overload.
• Durable construction: Rugged materials and simple hardware provide dependable support on most trailers when used as intended.
• Requires trim or tilt: Works with motors that have power trim or tilt so the head can seat against the transom reliably during setup.

Who It's For

The Attwood SP-400-RB is best for trailering owners of small to mid-size boats using outboards up to 100 HP who want an affordable way to reduce transom stress during transport. It's especially useful for anglers, weekend boaters, and anyone who frequently launches and hauls at ramps where road vibration and bumps can otherwise strain the motor mount.

Those who should look elsewhere include owners of high-horsepower outboards above 100 HP or boats that cannot tilt or trim their motor into a position the composite head can accept. Buyers wanting an ultra-heavy-duty, welded steel system for commercial towing may prefer a beefier alternative.

Pros & Cons

Pros

• Simple, adjustable design fits a wide range of trailer setups and transom distances.
• Composite head protects the engine cowling while providing reliable cantilever support.
• Choice of roller or trailer mount brackets makes installation adaptable to existing trailer hardware.

Cons

• Some users report mixed opinions on long-term durability, so heavier or very frequent use may show wear over time.

Specifications

Product	Adjustable Transom Saver SP-400-RB
Length range	23 to 35 in adjustable
Head material	Composite head
Motor compatibility	For use with motors 100 HP and under
Mount options	Roller bracket or trailer mount bracket
Intended use	Supports cantilevered engine during transport

Our Verdict

The Attwood SP-400-RB is a practical, budget-friendly transom saver for recreational boaters with outboards up to 100 HP who need to reduce transom stress while trailering. It provides a clear benefit in fit, ease of installation, and adaptable mounting, and represents good value if used within its design limits; buyers needing extreme durability or support for higher horsepower should consider heavier alternatives.

Frequently Asked Questions

Will this work with my 75 HP outboard?
Yes, the SP-400-RB is suitable for outboards up to 100 HP, and many users report good performance with 75 HP motors.

Can it attach to a trailer roller bracket?
Yes, it ships with the option to mount to a trailer roller bracket or a trailer mount bracket depending on your rig.

Does the motor need trim or tilt?
Yes, the motor must have power trim or tilt so the composite head can be positioned to support the engine properly.