Shimano Ultegra-105 Di2 12V derailleur charger cover - Y3J145000

Shimano l Y3J145000 is a protective cover designed for the charging port on Shimano Di2 12-speed rear derailleurs, specifically on the Ultegra R8150 and 105 R7150 groupsets. It protects the derailleur’s built-in charging port from moisture, dust and impacts, thereby ensuring the long-term reliable operation of the electronic system.

Fitted directly onto the Di2 rear derailleur, this small component plays a vital role: without it, the charging port could become clogged or damaged, which could lead to connection issues or problems with battery charging. It is therefore a simple yet essential protective component for the longevity of the Di2 12V Shimano system.

Technical specifications

• Brand: Shimano
• Part number: Y3J145000
• Type: charging port cover (charger cover)
• Compatibility: Shimano Di2 12-speed
• Compatible groupsets: Ultegra R8150, 105 R7150, Dura-Ace R9250, GRX Di2 12V
• Location: electronic rear derailleur
• Function: protects the charging port
• Material: lightweight engineering plastic
• Official spare part Shimano

Key features

• Effectively protects the Di2 charging port
• Prevents dust, water and corrosion from affecting the connector
• Shimano-approved part, a perfect fit
• Quick and easy installation without the need for special tools
• Helps ensure the reliability of the electronic system
• Essential in the event of loss or breakage of the original cover

FAQ

What is this Shimano cover used for?

It protects the Di2 derailleur’s charging port from dirt, water and impacts, ensuring a secure connection to the charger.

Which groupsets is it compatible with?

It is compatible with Shimano Di2 12-speed groupsets such as Ultegra R8150, 105 R7150, Dura-Ace R9250 and GRX Di2.

Can you ride without this cover?

Yes, but it is not recommended: the charging socket becomes exposed and may become clogged or damaged.

Is this a universal Di2 part?

No, it is specific to R7100/R8100/R9200 generation 12-speed Di2 rear derailleurs.

Is it easy to replace?

Yes, it’s a small part that clips on or slots into place, and can be replaced in a matter of seconds.