Derailleur Hanger 666 Single Speed UDHSRAM COMPATIBLE UNIVERSAL DERAILLEUR HANGER For Single Speed Meet the ultimate solution for riders running single speed setups on UDH compatible frames. The DROPOUT 666 eliminates the traditional derailleur mount for a streamlined, purpose built design that delivers both form and function. Universal Fit Works with all UDH compatible sliding dropout systems and eccentric bottom bracket designs. Clean Aesthetic Removes the derailleur mounting area for a