Shimano Alivio Rear Derailleur 7 Speed RD-TZ31 Mountain Bike Silver MTB RD-TZ31 New Rear Derailleur The latest version of RD-TZ30. It is an exactly same size and type of TZ30. This model is hub bolt mount type. Please check the mount type of your original part. Features: 7 speed hub bolt mount type Hanger Mount Mountain Bike/road bike Rear Derailleur - SKU: RD-TZ31 30-Day Money Back. No question ask. Need return item Contact us anytime 24/7 and I will get back to you within 24 Hours. Experienced in home garden product. Assist heaps of local retails sourcing Well customer service and quick reply your questions within 24hrs Don't hesitate to contact us at anytime via message Please don't left a negative feedback easily without any notices, it solve nothing. Please trust us and will definetly do your favor! Also welcome wholesale and customizes service Fast Worldwide Shipping! All orders are shipped within 48 Hours of your cleared Payment Please select a best shipping options for yourself when check out See here: - Economy :10~21 day - Standard :10~21 day W. tracking - Expedited : 3~7 day Full Tracking