--- product_id: 70529992 title: "KCNC Road Cyclocross Gravel Bicycle Bike Rear Derailleur Oversized Pulley Wheel System Cage OSPW for Shimano Dura-Ace/Ultegra 6700/6770/6800/6870/7900/7970/9000/9070 use in Black/Red/Gold Colors" brand: "kcnc" price: "FREE" currency: TND in_stock: false reviews_count: 3 category: "Outdoors" url: https://www.desertcart.tn/products/70529992-kcnc-road-cyclocross-gravel-bicycle-bike-rear-derailleur-oversized-pulley store_origin: TN region: Tunisia --- # KCNC Road Cyclocross Gravel Bicycle Bike Rear Derailleur Oversized Pulley Wheel System Cage OSPW for Shimano Dura-Ace/Ultegra 6700/6770/6800/6870/7900/7970/9000/9070 use in Black/Red/Gold Colors **Brand:** kcnc **Price:** FREE **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** KCNC Road Cyclocross Gravel Bicycle Bike Rear Derailleur Oversized Pulley Wheel System Cage OSPW for Shimano Dura-Ace/Ultegra 6700/6770/6800/6870/7900/7970/9000/9070 use in Black/Red/Gold Colors by kcnc - **How much does it cost?** FREE with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/70529992-kcnc-road-cyclocross-gravel-bicycle-bike-rear-derailleur-oversized-pulley) ## Best For - kcnc enthusiasts ## Why This Product - Trusted kcnc brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description KCNC Road Bike Derailleur Pulley Wheel Kit for Shimano Dura Ace/Ultegra The system consists of Top 14t & Bottom 16t alloy pulley wheels fitted with low friction bearings and a lightweight cage made from 7075 Alloy . The Oversized Pully Wheel SYS system reduces friction in the pulleys by 45 % and for your optimised performance. The system is compatible with Shimano Ultegra/Dura Ace 10s and 11s, electronic and mechanical rear derailleur . Top Pully :14T Bottom Pully :16T Matiral : 7075 Alloy Weight : approx.57 grams For Road Shimano Ultegra/Dura Ace 6700/6800/7800/7900/7970/9000/9070 use ## Features - WHY USING OVERSIZED PULLEY WHEEL CAGE-Upgrade your drivetrain for ultimate efficiency and superior performance.KCNC Wheel Bearings reduce friction, which gives you a lower rolling resistance.Upgrading your wheel bearings to oversized pulley will maximize the return you get from your energy.KCNC oversized pulley cage reduce friction and increases resistance to contamination and corrosion. - THE EFFICIENCY OF OSPW-The Oversized Pully Wheel(OSPW) system reduces friction in the pulleys by 45 % and for your optimised performance.The overall power savings of the OSPW System for Shimano 9000/6700 reach 30%-60%, or more in some cases, over a stock setup.Almost have the same efficiency ratio with Ceramicspeed. - UPGRADE YOUR CASSETTE-The system is compatible up to a 28T cassettes on most bikes depending on derailluer hanger.The system consists of Top 14t & Bottom 16t alloy pulley wheels fitted with low friction bearings and a lightweight cage made from 7075 Alloy.Coated bearings prolong the lifetime even further.The oversized pulley wheels have 3-5 times longer lifetime than the commonly used standard pulleys on the market. - COMPATIBILITY-The system is compatible with Shimano Ultegra/Dura Ace 10s and 11s,electronic and mechanical rear derailleur.This specific system is compatible with Ultegra 6700/6770/6800/6870 mechanical and Di2 rear derailleurs and Dura Ace 7900/7970/9000/9070 mechanical and Di2 rear derailleurs. - SPECIFICATION-Top Pully :14T with sealed bearing / Bottom Pully :16T with sealed bearing / Matiral : AL7075 Fully CNC/ Color:Black,Red,Gold available / Weight : approx.57 grams / For Road Shimano Ultegra/Dura Ace 6700/6770/6800/6870/7900/7970/9000/9070 use ## Images ![KCNC Road Cyclocross Gravel Bicycle Bike Rear Derailleur Oversized Pulley Wheel System Cage OSPW for Shimano Dura-Ace/Ultegra 6700/6770/6800/6870/7900/7970/9000/9070 use in Black/Red/Gold Colors - Image 1](https://m.media-amazon.com/images/I/31efnpwqWTL.jpg) ![KCNC Road Cyclocross Gravel Bicycle Bike Rear Derailleur Oversized Pulley Wheel System Cage OSPW for Shimano Dura-Ace/Ultegra 6700/6770/6800/6870/7900/7970/9000/9070 use in Black/Red/Gold Colors - Image 2](https://m.media-amazon.com/images/I/41fsT0tkSJL.jpg) ![KCNC Road Cyclocross Gravel Bicycle Bike Rear Derailleur Oversized Pulley Wheel System Cage OSPW for Shimano Dura-Ace/Ultegra 6700/6770/6800/6870/7900/7970/9000/9070 use in Black/Red/Gold Colors - Image 3](https://m.media-amazon.com/images/I/41yVMMqGp1L.jpg) ![KCNC Road Cyclocross Gravel Bicycle Bike Rear Derailleur Oversized Pulley Wheel System Cage OSPW for Shimano Dura-Ace/Ultegra 6700/6770/6800/6870/7900/7970/9000/9070 use in Black/Red/Gold Colors - Image 4](https://m.media-amazon.com/images/I/51h8B1hjXBL.jpg) ![KCNC Road Cyclocross Gravel Bicycle Bike Rear Derailleur Oversized Pulley Wheel System Cage OSPW for Shimano Dura-Ace/Ultegra 6700/6770/6800/6870/7900/7970/9000/9070 use in Black/Red/Gold Colors - Image 5](https://m.media-amazon.com/images/I/31ZjQqxdYYL.jpg) ## Customer Reviews ### ⭐ Not safe due to too much skipping. *by M***F on Reviewed in the United States on August 14, 2020* I cannot recommend this product. The cage causes my drivetrain to skip whenever power is placed into my pedals. It happens when I take off from a stop, change gears, cross-chain, or shift under pressure. I have a new chain, cassette, and chainrings. They worked just fine prior to the install of the cage. I changed the tension and aligned my derialluer hanger, all to no avail. After five weeks of experimenting, I'm done trying to get it to work. FYI, the return policy is 30 days.With all that said, it is a quality product. The cage is CNC. The pulleys look really awesome. When not skipping, I do think they reduce drivetrain friction a bit. The pulleys spin nicely. ### ⭐⭐⭐ Gear metal is soft *by D***T on Reviewed in the United States on June 28, 2020* I installed this on my Cervelo R3 with all Dura Ace drive train except the cassette which I replaced to CS-6700 12T-30T for this setup only. Installation on the RD-7900 is easy but you need to read well ahead the instructions and understand it thoroughly before proceeding. Pay attention and note the rest position of the original pulley cage when the cage stop screw is released. I fixed the new pulley to the exact same position and orientation.The metals are soft. I did not use the supplied pivot bolt. I reused the original shimano pivot bolt. The color of the gears are red but after I few miles ride, the red color on the tooth are wears off and showing silver, like stainless metal color. ### ⭐ Snapped in half *by B***E on Reviewed in the United States on September 9, 2020* Not high quality - snapped in half when chain skipped a cog. --- ## 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.tn/products/70529992-kcnc-road-cyclocross-gravel-bicycle-bike-rear-derailleur-oversized-pulley](https://www.desertcart.tn/products/70529992-kcnc-road-cyclocross-gravel-bicycle-bike-rear-derailleur-oversized-pulley) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-11-10*