LTWOO 105 Rear Derailleur Jockey Wheel Set 13T Upper 18T Lower for Shimano R7000 R8000 5800 6800

Upgrading the jockey wheels on a compatible Shimano rear derailleur is a simple yet effective way to improve drivetrain efficiency. This LTWOO 105 jockey wheel set offers a direct replacement solution, using larger pulleys to increase chain wrap and reduce friction during gear changes. The set includes an upper 13-tooth pulley and a lower 18-tooth pulley, a combination that spreads chain load more evenly than standard 11-tooth designs. Available in both colourful and economic versions, it suits riders who want either a visual upgrade or a budget-friendly performance tweak. The rear pulley’s distinctive ‘chicken leg’ shape is a recognisable feature that also aids chain retention and alignment. Installation is straightforward, provided the pulleys are fitted in the correct orientation. The composite material offers a good balance of wear resistance and smooth running, making this set a worthwhile addition for cyclists looking to refresh their drivetrain without significant expense.

Features and Construction

This jockey wheel set is built around key specifications that directly affect shifting performance. The choice of tooth counts and materials reflects a focus on reducing drivetrain drag while maintaining compatibility with widely used Shimano groupsets.

13T Upper and 18T Lower Pulleys

The upper jockey wheel uses 13 teeth, while the lower has 18. This 13/18 configuration increases the total chain wrap angle around the derailleur, which helps reduce friction and keeps the chain running more quietly. The larger lower pulley also provides better chain guidance, especially under load, making it a practical upgrade for riders who want crisper shifts.

Composite Material and Build

Both pulleys are made from a composite material chosen for its durability and low running friction. This material does not require frequent replacement and performs reliably across typical riding conditions. The construction includes precision bushings or bearings (as per version) to ensure smooth rotation, though the exact internal specification may vary between the colourful and economic editions.

Colourful and Economic Versions

The set is available in two main lines: colourful versions, which feature anodised or coated finishes in various colours, and economic editions, which use a simpler, more cost-effective finish. Both versions share the same tooth counts and fundamental dimensions, so the choice is primarily aesthetic or budget-driven. Users should select the version that best matches their bike’s appearance or their spending preference.

Compatibility and Installation

This jockey wheel set is designed to fit specific Shimano rear derailleurs, making it important to check compatibility before purchase. The following groupsets are supported in both colourful and economic versions.

Compatible Groupsets

The set works with Shimano R7000 (105), R8000 (Ultegra), 5800 (105), and 6800 (Ultegra). Both the colourful and economic editions are cross-compatible across these models, so the same set can be used on multiple derailleurs in the same family. The compatibility is verified for 11-speed versions only; 10-speed or older models are not listed as supported.

Installation Tips

To install, remove the existing jockey wheels and place the new 13T pulley in the upper position and the 18T pulley in the lower position. Ensure the pulleys are oriented so the chain runs smoothly over the teeth. Tighten the mounting bolts to the manufacturer’s recommended torque – typically around 4–6 Nm. After fitting, run the chain through the pulley system and check for free rotation and correct chain tension.

Packing List

The package includes one guide wheel set, which consists of the upper 13T pulley and lower 18T pulley, plus the necessary mounting bolts and spacers. The set is supplied as a complete replacement kit, so no additional parts are required for installation on a compatible derailleur.

Benefits and Buying Value

Choosing this LTWOO jockey wheel set over standard replacements offers tangible advantages in drivetrain smoothness and longevity. The larger pulley sizes and material choice contribute to a noticeable improvement in shifting feel.

Reduced Drivetrain Friction

By increasing the chain wrap angle, the 13/18 pulley combination reduces the friction between the chain and derailleur plates. This results in slightly less effort needed to turn the cranks, which can make a difference during long rides or in high-intensity efforts. The reduction is small but measurable, especially compared to worn stock pulleys.

More Consistent Shifting

The larger lower pulley helps keep the chain aligned with the cassette sprockets during shifts, reducing the chance of missed gears or chain skip. This is particularly beneficial on hilly terrain or under high pedalling loads, where chain tension varies more. Riders can expect more predictable and quiet gear changes after installing this set.

Cost-Effective Performance Upgrade

Compared to replacing the entire rear derailleur, swapping the jockey wheels is a low-cost upgrade that can restore or improve shifting performance. The economic edition offers the same functional benefits at a lower price point, making it a practical choice for value-conscious cyclists. The colourful versions add a personalised touch without compromising function.