Never go for a ride without a chain tool again the only top cap system that doubles as an emergency chain tool works with any 1 18 inch steerer tube with 32mm of available depth adds only 25 grams over a traditional compression cap compatible with 8 9 10 and 11 speed chains holds quick links not included alloy version includes tool to properly set your star nut star nut not included carbon version includes expander plug for your carbon steerer