I'll google it for you......yes the sd300 is the newer thinner cable used with the 12s di2 groups.

i'm looking this cable to update the DI2 shifters firmware, after the firmware is upgraded the cable is not needed anymore ?

The ew-300 cable is only used on the newer 12 speed systems. Those systems have a Bluetooth system built into the rear derailleur that uses the Shimano app to upgrade the firmware. You use the Shimano e-tube app on your cell phone. The older systems use a special interface adapter that you have to purchase to do that. Short answer is that you never need that cable to do a firmware upgrade.

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Shimano 2Nd Gen E-Tube Di2 Wire Ew-Sd300, 1400Mm | cycling-electronics-accessories

Product ID: 283475470

Details

Brand
SHIMANO
Cable Type
HDMI
Compatible Devices
Bicycle
Connector Type
USB Type C
Special Feature
Portable

⚡Ultra-fast electronic shifting

🔌Compact, lightweight cable design

🔧Seamless compatibility with top Shimano drivetrains

$69.29

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Description

⚡ Shift into the future with Shimano’s sleek, smart e-tube wire!

PLUG PLAY SIMPLICITY - USB Type-C connector for easy installation and seamless integration with Shimano’s latest systems.
FEATHERLIGHT FLEXIBILITY - Ultra-compact and lightweight cable ensures minimal drag and maximum frame compatibility.
BUILT TO LAST GUARANTEED - Backed by a 2-year manufacturer warranty for worry-free performance.
PRECISION POWER CONNECTION - Experience lightning-fast, flawless gear shifts with Shimano’s cutting-edge Di2 technology.
TAILORED FIT FOR EVERY RIDE - Available in multiple lengths to perfectly match any road or e-bike frame geometry.

The Shimano 2nd Gen E-Tube Di2 Wire EW-SD300 is a lightweight, compact electronic cable designed for Shimano’s latest 12-speed Ultegra R8100 and Dura-Ace R9200 road bike drivetrains and EP800 e-bike systems. Offering multiple length options and a USB Type-C connector, it ensures seamless, ultra-fast electronic shifting with a reliable 2-year warranty.

Specifications

ASIN	B08X1YSN8L
Best Sellers Rank	#201,932 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #115 in Bike Cables
Brand Name	SHIMANO
Cable Type	HDMI
Color	Black
Compatible Devices	Bicycle Electronic Shifting Systems
Compatible Phone Models	No Compatible Phone Models
Connector Type	USB Type C
Customer Reviews	4.7 4.7 out of 5 stars (30)
Global Trade Identification Number	00192790635286
Included Components	E-Tubes, Cables & Extensions
Indoor Outdoor Usage	Indoor
Item Length	9 Inches
Item Weight	1.44 ounces
Manufacturer	Shimano
Model	Shimano
Model Name	EW-SD300 eTube Di2 Wire
Number of Items	1
Other Special Features of the Product	Portable
Part Number	IEWSD300L140
Recommended Uses For Product	Bicycle Electronic Shifting Systems
UPC	192790635286
Unit Count	1.0 Count
Warranty Description	Limited Warranty

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$69.29

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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