--- product_id: 451202909 title: "Rear Derailleur, Huazu Bike Parts Gear Shifter for RD-TZ31-A with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles" brand: "huazu" price: "FREE" currency: EUR in_stock: false url: https://www.desertcart.hr/products/451202909-rear-derailleur-huazu-bike-parts-gear-shifter-for-rd-tz31 store_origin: HR region: Croatia --- # Direct mount design 6/7 speed compatibility Durable aluminum alloy Rear Derailleur, Huazu Bike Parts Gear Shifter for RD-TZ31-A with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles **Brand:** huazu **Price:** FREE **Availability:** ❌ Out of Stock ## Summary > ⚡ Shift into the fast lane with precision and durability! ## Quick Answers - **What is this?** Rear Derailleur, Huazu Bike Parts Gear Shifter for RD-TZ31-A with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles by huazu - **How much does it cost?** FREE with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/451202909-rear-derailleur-huazu-bike-parts-gear-shifter-for-rd-tz31) ## Best For - huazu enthusiasts ## Why This Product - Trusted huazu brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Universal Compatibility:** Fits mountain, road, folding bikes, and tricycles—upgrade your ride regardless of style or terrain. - • **Wide Gear Range Capacity:** Supports up to 34T total capacity with sprockets from 14T to 28T, perfect for varied terrain challenges. - • **Robust Direct Mount Build:** Crafted with durable aluminum alloy and plastic for stable, reliable performance without hub bolt hassles. - • **Seamless 6/7 Speed Shifting:** Optimized for GS 6/7 speed SIS Index drivetrains, ensuring smooth gear transitions on every ride. - • **Hassle-Free Installation & Warranty:** Comes with supporting bolt, easy to install if you know your bike, plus a 12-month worry-free warranty. ## Overview The Huazu RD-TZ31-A Rear Derailleur is a direct mount, 6/7 speed compatible gear shifter designed for mountain, road, and folding bikes. Made from durable aluminum alloy, it offers stable and smooth shifting with a wide gear range capacity of up to 34T. Easy to install and backed by a 12-month warranty, it’s a reliable upgrade for riders seeking performance and versatility. ## Description Huazu Rear Derailleur RD-TZ31-A 6/7 Speed Direct Mount for Mountain Bike, designed to provide smooth and stable gear shift performance, and making riding easy and comfortable.Fit For: Suitable for Shimano, mountain bikes, road bikes, folding bicycles, tricycles ect. Condition: 100% newMaterial: aluminium alloy Mount Tape: Direct mount, not hub bolt mount.Packing Included: — 1pcs Rear Derailleur — 1pcs Supporting Bolt After-sales service：Please feel free to contact us if you have any issues with the Rear Derailleur, don't worry about after-sales service. We accept return/replace with any reason. We provide 12-MONTH warranty for all of our products since the purchasing day. ## Features - MODEL: RD-TZ31-A bike rear derailleur, Compatible with GS 6 / 7 speed SIS Index Shifting drivetrains. - STABILITY: Durable aluminum alloy and plastic alloy material, Providing excellent shifting performance ensure safe and stable. - PARM: Total capacity 34T, Largest sprocket 28T, Smallest sprocket 14T, Front chain wheel tooth difference 20T. - NOTE: The bike rear derailleur is direct mount, not hub bolt mount. Please check the mount type of the original part before ordering, if bike frame with hook, as picture shows, you can use it. - COMPATIBILITY: Suitable for mountain bikes, road bikes, folding bicycles and so on. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09WRBHZNT | | Brand | Huazu | | Brand Name | Huazu | | Case Material Type | Aluminum | | Color | Black | | Colour | Black | | Item Dimensions L x W x H | 13L x 10W x 4H centimeters | | Item Weight | 0.28 Kilograms | | Item weight | 0.28 Kilograms | | Manufacturer | Huazu | | Manufacturer Part Number | RDTZ31A | | Material | Aluminum | | Material Type | Aluminum | | Model Number | RDTZ31A | | Mount Type | Direct Mount | | Mounting type | Direct Mount | | Number of Items | 1 | | Number of Teeth | 28 | | Product dimensions | 13L x 10W x 4H centimeters | | UPC | 731235765869 | ## Product Details - **Brand:** Huazu - **Colour:** Black - **Item weight:** 0.28 Kilograms - **Material:** Aluminum - **Mounting type:** Braze-On Mount ## Images ![Rear Derailleur, Huazu Bike Parts Gear Shifter for RD-TZ31-A with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles - Image 1](https://m.media-amazon.com/images/I/71GhNj+FQXL.jpg) ![Rear Derailleur, Huazu Bike Parts Gear Shifter for RD-TZ31-A with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles - Image 2](https://m.media-amazon.com/images/I/81E98rTDIML.jpg) ![Rear Derailleur, Huazu Bike Parts Gear Shifter for RD-TZ31-A with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles - Image 3](https://m.media-amazon.com/images/I/71A6jDZ8TdL.jpg) ![Rear Derailleur, Huazu Bike Parts Gear Shifter for RD-TZ31-A with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles - Image 4](https://m.media-amazon.com/images/I/71XteKnJUgL.jpg) ![Rear Derailleur, Huazu Bike Parts Gear Shifter for RD-TZ31-A with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles - Image 5](https://m.media-amazon.com/images/I/71ruhNVt-kL.jpg) ## Questions & Answers **Q: Does it work with mongoose R4050WM 21 speed mountain bike?** A: I used it on my teens mongoose, unsure of the model, but I would think so? **Q: Does it work for a 21 speed bike?** A: Yes, we used it for a 21 Speed Mongoose bike ## Frequently Bought Together - Rear Derailleur, Huazu Bike Parts Gear Shifter for RD-TZ31-A with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles - Bike Chain Kit, Single/6/7/8/9/10/11/12 Speed Multi-Function Bike Mechanic Repair Kit, Chain Breaker and Bike Link Plier with Hook and 6 Pairs Bicycle Buckle, Reusable (6/7/8 Speed Bike Chain Kit) - FGBNM Single/6/7/8/9/10/11/12 Speed Bike Chain, Bike Chain for Road Mountain Racing Cycling --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/451202909-rear-derailleur-huazu-bike-parts-gear-shifter-for-rd-tz31](https://www.desertcart.hr/products/451202909-rear-derailleur-huazu-bike-parts-gear-shifter-for-rd-tz31) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-10-10*