TOPVOP auto Folding Sag Scale for Motorcycles — Blue 0–120 mm Aluminum, Fits Hollow Axles to 20 mm

The TOPVOP Folding Sag Scale is a portable aluminum suspension sag ruler that clips into your axle to measure motorcycle sag quickly and read directly in millimeters.

When fine-tuning motocross or off-road suspension, getting an accurate sag measurement is essential and the TOPVOP Folding Sag Scale is built to make that process simple at the track or in the garage. Machined from 6061-T6 aluminum with a blue anodized finish, the scale folds for compact storage and extends to give a clear, direct metric readout without mental subtraction. It includes a cone-shaped axle locating pin that fits hollow axles up to 20 mm and laser-etched 0–120 mm markings in 1 mm increments for reliable, repeatable setup checks.

How do I use this sag tool to measure my motorcycle's suspension?

Set your bike on a stand so the suspension is unloaded, then insert the tapered cone into the axle opening and swing the ruler down until it reaches your reference mark. Lock the sliding zero with the knob, lower the bike to its intended ride height, and read the sag directly from the scale—no subtraction needed.

• Insert cone into axle (fits hollow axles up to 20 mm).
• Align zero to reference mark and tighten the knob.
• Lower bike to ride height and read sag on 0–120 mm scale.
• Use 1 mm increments for precise tuning.

What makes the folding design practical for riders and mechanics?

The swing-out arm extends to 28-3/8 inches for full measurements and collapses to 15-3/4 inches so it fits into toolboxes or saddlebag compartments. Because it’s made from lightweight yet strong 6061-T6 aluminum, the tool stays rigid while remaining portable for track days or field tuning sessions.

• Extends to 28-3/8 inches for full-range measurements.
• Folds to 15-3/4 inches for compact storage.
• Durable 6061-T6 construction with blue anodized finish.
• Laser-engraved markings resist wear and stay readable.

Will this sag scale fit my dirt bike or motocross model?

The tapered axle cone is designed to fit most hollow axles up to 20 mm, making it compatible with many mini bikes and full-size motocross machines. Before ordering, measure the inside diameter of your axle opening to confirm fit—if your axle is solid or larger than 20 mm, this tool won’t seat properly.

• Designed for mini bikes and full-size motocross models.
• Cone fits hollow axles up to 20 mm; check axle opening first.
• Replaces models like 08-0613 for many common setups.
• Not suitable for non-hollow or oversized axles without adapter.

How accurate and repeatable are the measurements?

Measurements are direct and user-friendly: slide the zero to your reference point and tighten the knob, so readings require no subtraction and reduce human error. The 1 mm engraved increments and rigid aluminum body provide consistent, repeatable readings when used on a stable stand and with consistent rider positioning.

• Direct-reading design eliminates manual subtraction errors.
• 1 mm laser-etched increments for precise adjustment.
• Solid aluminum reduces flex for repeatable results.
• Quick setup speeds up race-day and workshop tuning.

Who is this for: The TOPVOP Folding Sag Scale is best suited to motocross riders, dirt-bike racers, mechanics and serious hobbyists who want a fast, portable, and accurate way to set suspension sag. It’s ideal for anyone who needs reliable metric readings on the go—track technicians, weekend riders upgrading suspension, and garage tuners who value durability and compact storage.