the Park Tool HMR-4 features:

It can simultaneously pair with ANT+ and Bluetooth enabled power meters

cables and derailleurs

Grunge Brush: Perfect for your chain and chainrings

Power Spline or Power Drive bottom bracket interface

Hope Floating Disc Brake Rotor - Blue - 180mm - 6 Bolt Envelope Shipping the Park Tool HMR-4 features:As with everything that Hope produces, there is a whole bunch of precision engineering and fine attention to detail that goes into the creation of their brake rotors. The braking surface is laser cut from a sheet of steel and riveted to an aluminium central carrier to promote the dissipation of heat and compensate for thermal expansion. Available in a range of anodised colours, these rotors will make any bike look great while also improving its