Aluminum alloy construction Crafted from lightweight aluminum alloy, this tensioner provides improved strength and longevity for your singlespeed folding bicycle. Hollow design for efficiency The hollow design reduces weight and helps prevent the chain from falling off during rides. Elegant aesthetics With exquisite workmanship and stylish lines, this bike accessory adds a fashionable touch to your ride and helps it stand out on the road. Easy installation Designed for straightforward setup; no modifications or drilling required, enabling quick setup and immediate use. Use scenarios Urban commuting with a folding bike: maintain reliable chain tension during frequent stops and starts, reducing derailment risk. Weekend or recreational rides: lighter weight contributes to overall efficiency without compromising strength. Travel or multibike setups: no drilling required, tools installation makes it easy to swap between bikes or carry as a spare.