Finally upgrade to Shimano Di2 system

2 days ago I upgrade my groupset from Shimano GRX820 to Di2 system. I think this upgrade is very economical for non-UDH frames.

I only replaced the shift levers and rear derailleur:

RX820 Shift Lever —> RX825 Shift Lever

RX822 Rear Derailleur —> M8250 Rear Derailleur

（I made no changes to the rear cassatte

, crankset and chain. Because they are all 1×12-speed.）

I really love the RX825’s one-finger braking design. This design gives me more confidence when off-roading. It’s a completely different experience compared to the RX820.

Btw, official boxed RX825 shift levers are quite difficult to buy in China now, but I was lucky enough to get a pair.

For the rear derailleur, the Deore XT M8250 far exceeded my expectations. Although it's much bulkier than SRAM's UDH rear derailleur due to patent restrictions, there weren't any better options at this price.

About ten years ago, when I was in junior high school, I also used the Deore XT rear derailleur (M781 I remember). But at that time there was only 10 speed. Now I'm using the Deore XT again, what a cycle lol.