Shimano Cyclocross FD CX70 Top Pull Front Derailleur. When you're doing your best to stay upright through an off camber turn in 6 inches of sand, the last thing you want to worry about is whether or not your front derailleur will actually shift. Never fear, because Shimano is here with a 'cross specific front derailleur. Yes, it's true. The Shimano FD CX70 is an Ultegra level top pull front cyclocross derailleur made to work with Shimano STI levers. It's designed to shed even the stickiest of mud, and shift through the lower gearing range used in cyclocross. Now all you're missing is a jar of embro and a bag of Belgian fries.