Use this tool to replace that complete wheel you keep around to check your wheel alignment. Along with being less expensive then a complete wheel, this tool is much more accurate and repeatable. The beam pivots on bearings around the dummy axle allowing you to check both the seat stays and the chainstays without having to reset your tool. Its small size also makes it easier to visually or mechanically check the spacing between the stays. Available for 26″, 29″ 700c or 650b. Replaceable Q.R. axles for different spacings are also available.