The DURA-ACE ST-R9250 rim brake levers weigh about 230g for a pair of levers.
They're essentially the same as the previous generation DURA-ACE levers, except for the fact that they'll work with the 12-speed derailleurs - using the SD300 port type.
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Since these 12-speed rim brake shifters are essentially the previous generation shifters, they do not feature wireless shifting. You can only connect them to a Di2 system using EW-SD300 wires.
12-speed rim brake shift levers have two SD300 ports and one satellite shifter (SW-RS801-T / SW-RS801-S / SW-RS801-E) port.
Shimano 12-speed satellite shifters are tiny buttons or shifters that you can place in the drops, on the tops, or on your aero extensions. This page explains how to install the different satellite shifters and how to wrap the handlebar tape around them.
Learn how to install Di2 drop bar levers commonly used on Di2 road bikes or Di2 gravel bikes. I'll walk you through the process and give you some useful tips.
Modern Di2 shift levers have buttons on top of the hoods, but unless you're on 12-speed Di2, their default function only works with a wireless unit or d-fly. Learn how to set these buttons to shift derailleurs.
Do you have small hands? Or extra large hands? Read this page to figure out how to change your Shimano Di2 shift lever (or shifter) reach.
