Convenient Tool: Keeps the bike chain under tension when the wheel is removed, to make working on these pieces easier and faster. Small Size: Tool is sized for easy transport and portability. Easy to Clean: Durable to use and clean. Sized for Road Bikes: Choose the 135mm size for mountain bikes. Also includes disc brake pad adapter. Take the Terrain: Attack the mountains, roads, or just your work commute confidently with superiorly made award-winning accessories from BBB Cycling.