Park Tool Chainring Diameter Gauge CDG-2

. An accurate and easy to use tool for measuring the bolt circle diameter BCD on four and five bolt chainring patterns, the Chainring Diameter Gauge CDG 2 will let you know precisely the size of chainring you can comfortably fit to your frame. Quick and Accurate BCD Measurement . Measuring in millimetres for the most precise results, the Chainring Diameter Gauge CDG 2 is built from anodised aluminium and has clear to read laser engraved measure points. The tool gathers its measurements when the piloted tips on its arms are inserted into the chainring holes, crank arm holes or chainring bolts, to find the distance between the two arms. Coming complete with a centre to centre distance scale and mounting pattern reference chart for additional pattern measurements, this Park Tool gauge is a great tool to use when considering replacing or upgrading your chainring. Features Material Anodised Aluminium Compatibility 4 and 5 Bolt Chainring Patterns Buy Park Tool Accessories from Chain Reaction Cycles, the World's Largest Online Bike Store.