Motool Slacker Digital Suspension Tuner Review

Review: Motool Slacker Digital Suspension Tuner

The Motool Slacker is one of the most refined tools available today for measuring and dialing in suspension sag on motorcycles. After using the Slacker, it’s hard to go back to tape measures, zip ties, or other manual sag-setting methods. Especially at a price of $74 currently. (More Info)

What It Is & How It Works

• The key feature is a digital scale integrated into a retractable cable — you mount the main unit (magnetically) to your unsprung mass (e.g., the axle), and then hook the cable to a fixed point on the body of the bike.

• It provides real-time sag readings, so you can watch how the suspension compresses under load (static sag) and when you sit on the bike (rider sag).

• The Auto Zero function (available in newer versions) lets the device auto-learn the “zero point” when the suspension is fully extended. This means you don’t always need a stand or extra help; you just lift the bike and let the Slacker do its calibration.

• On the V4 model, there’s Bluetooth integration so you can use your phone (iOS or Android) as a remote display via Motool’s Service Assistant app.

• There’s also a physical remote LCD display (on older or alternate versions) so you can read measurements easily without twisting your neck.

• The unit can provide more than just sag: by watching how the number changes when compressing and releasing the suspension, you can infer stiction (how much friction in your suspension).

Performance & Accuracy

• Slacker significantly simplifies sag measurement, especially if you’re working alone.

• The backlit display helps for measurements in low light.

• According to the manual, it’s important to align the cable at a roughly 90° angle to avoid skewing the reading.

Build Quality & Design

• The magnet that holds the unit to metal axles is very strong, which gives a stable mounting point.

• The physical unit and the remote are robust; Motool says it’s “faster, more precise, and eliminates the human factor.”

• For V4, the hardware and software were updated, and it’s produced in a newer manufacturing facility, which helps with reliability.

Usability

• One person can measure sag easily, thanks to the Auto Zero and the remote display.

• It’s versatile and it’s compatible with a variety of bike types (off-road, street, adventure) as long as they have steel axles (or compatible inserts).

• There’s some learning curve: mounting the hook, placing the tool, and correctly zeroing require attention to detail (the manual is pretty specific).

• The Slacker app / virtual remote is very handy — you can save sag values, track your settings per bike, and reference them later.

Drawbacks / Criticisms

• Cost: For some riders, especially those who rarely change suspension setup, the Slacker may feel like an expensive “nice-to-have” tool. “It’s handy … but for single use, once in a great while, it’s hard to justify the price.” Lets face it a tape measure is cheap but required another person and math.

• Auto Zero caveats: According to the spec sheet / manual, Auto Zero only activates when the cable has extended a certain distance (5 mm) to avoid false zero readings.

• Reliability reports: Some users have reported occasional issues, like the unit only reading “0” or “2,” or random fluctuations.

Value & Recommendation

• Who it’s great for:

  • Suspension enthusiasts who regularly tune their bikes or have multiple bikes.

  • Racers who want repeatable, precise sag setup.

  • Riders who frequently switch riding conditions (track, trail, street) and need to re-set sag.

  • Mechanics / shops working on multiple bikes.

• Maybe overkill for:

  • Casual riders who set their sag once and rarely change.

  • Budget-conscious riders who don’t want to spend extra for a digital tool.

Summary (Pros & Cons)

Pros:

• Very accurate, real-time sag measurements

• Auto Zero mode eliminates need for a second person or bike stand

• Remote LCD or Bluetooth app makes measurement solo-friendly

• Helps detect suspension stiction / friction

• Strong build and magnetic mount

Cons:

• Relatively expensive

• Setup / mounting requires care

• Reports of rare measurement glitches from some users (probably operator error)

Final Thoughts

Overall, the Motool Slacker Digital Suspension Tuner is highly recommended for anyone serious about suspension setup. It makes accurately measuring sag fast, solo, and repeatable — which can dramatically improve your bike’s handling and ride quality. For frequent tuners, racers, or people working on multiple bikes, it’s probably worth every penny. For more casual or once-in-a-while adjustment, it might be more of a luxury than a necessity. Currently Usdualsports has a limited time discount code that will save you 40% making the sag tool $74. Use (THIS LINK) and enter code-DUALSPORT at check out