Park Tool Professional Wheel Alignment Gauge WAG-4

For a wheel to perform properly, it is important for the rim to be centered between the locknuts of the hub, or “dished.” To check this, and to make precision adjustments, a wheel alignment gauge (also called a “dishing tool”) is a must. An accurate and truly versatile wheel alignment gauge that belongs along side every truing stand.

Warning: California Proposition 65 

https://planet-cyclery.myshopify.com/pages/warning-california-proposition-65

The WAG-4 allows easy checking of the dish on road, mountain, or BMX wheels from 16" to 29" (ETRTO or ISO rim sizing of 305-630)

Works with any hub width

Can be accurately used with the tire still on the wheel