MODELRD-TZ31-A bicycle rear derailleur, Compatible with 6/7-speed SIS index shift drivetrains. <br> IMPORTANTMountain bike rear derailleur, it This is a mountain bike direct mount rear derailleur, no hook mount. <br> EXCELLENT PERFORMANCEPrecise gears provide light and stable shifting performance and make riding easy and comfortable. <br> MATERIALMade from high quality steel material, durable and long lasting. Easy to install and disassemble. <br> APPLICATIONSuitable for mountain bikes, road bikes, variable speed bikes, folding bikes and city bikes. It is your must-have bicycle accessory on your cycling trip. <br> Please note that due to manual measurement and display differences, there may be slight differences between individual products and the pictures.