Black by absoluteblack narrow wide oval single chainringoval chainrings are hugely effective because a rider does not produce power evenly through the pedal stroke this narrow wide oval single chainring works to maximise your power output where the most force is applied and minimise resistance where it isnt interestingly your pedal stroke feels more natural and round with this narrow wide oval single chainring than with a traditional round chainring featuresmaterial 7075 txxx aluminiumov