Park Tool Wheel Alignment Gauge WAG-4 — Professional wheel dish & lateral checker for 16–29" wheels

The Park Tool WAG-4 is a professional wheel alignment gauge designed to quickly and accurately check wheel dish and lateral alignment on 16" to 29" road, mountain, and BMX wheels—even with the tire still mounted.

If you build, service, or inspect wheels, consistent dish and lateral alignment are essential for safe handling and long component life. The WAG-4 combines a compact, intuitive design with wide compatibility so you can verify wheel centering across rim sizes and hub widths without swapping adapters. Its simple contact points and scale let you make repeatable measurements on the bench or attached to a bike.

How does the WAG-4 measure wheel dish and lateral offset?

The gauge references fixed points on the rim to determine how centered the rim is relative to the hub. By seating its tips against the rim and reading the scale, you can see whether the rim is shifted left or right and by how much, letting you correct spoke tension or axle placement.

• Works across 16"–29" rim diameters without special adapters.
• Tips contact the rim flange for reliable repeatable readings.
• Scale provides precise left/right offset information for truing adjustments.

Can I use this tool with the tire still on the wheel?

Yes—the WAG-4’s design accommodates a mounted tire so you can check dish without removing the wheel from a finished build or service. That saves time and preserves tire and tube positioning while you evaluate lateral centering.

• Accurate even with common tire widths installed.
• Avoids repeated tire mounting and demounting during adjustments.
• Suits routine shop checks and pre-ride inspections.

Is the WAG-4 compatible with different hub widths and wheel types?

The gauge is engineered to work independently of hub width and accepts road, mountain, and BMX wheel constructions. Its contact geometry and measurement method make it versatile across axle standards and rim profiles used in modern bikes.

• No hub-width-specific parts required—one tool fits many setups.
• Works with straight-pull and J-bend spoke builds alike.
• Applicable for alloy and many tubeless-compatible rim designs.

How does the WAG-4 fit into a shop workflow or home mechanic kit?

The WAG-4 is compact and quick to use, making it a useful complement to truing stands, spoke wrenches, and rim alignment checks. Use it for initial wheel building, final quality checks, and periodic on-bike inspections to maintain optimal wheel performance.

• Adds a fast diagnostic step before full truing or disassembly.
• Simplifies repeatable documentation of wheel centering during builds.

Who is this for? The Park Tool WAG-4 is ideal for professional mechanics, wheel builders, and serious home cyclists who need a dependable, easy-to-use way to confirm wheel dish and lateral alignment. If you routinely assemble wheels, service customer bikes, or want to reduce rework caused by off-center rims, the WAG-4 gives repeatable, shop-grade measurements without complicated setup.