Topeak products are designed to be the best available and the topeak mini dx pump is no exception this stylish upgrade to the top selling mini is small in size but huge in performance available with or without a guage this pump is great for mountain or road bikes this fantastic mini bike pump allows compact dual action pumping with a padded ergo fit grip for comfort lending versatility topeak have given the mini dx a smarthead connector which will fit both presta and schrader valves so it