The crank brothers multi 19 tool if you ever find that you need to keep tweaking your bike when you are out on the trails then the crank brothers multi 19 tool is definitely worth the investment packed full with 19 tools the trail bike tool is the perfect piece of equipment to have in the bottom of your bag when you find that something isn39t quite right on your bike the crank brothers multi tool is so compact and only weighs 175g without the tool flask so you won39t even no