Shimano Ultegra Di2 R8050 11-speed electric rear derailleur for road bikes

Easy to assemble and with the help of a tutorial, precise adjustment is done without problem. Quite high price. (Translated review)

To be tested over time, it has only a few kilometers on the clock. It served to replace the same with a medium cage, switched to a short cage with a change from Ultegra 11x34 to Dura-Ace 11x30. This medium cage version lasted 10-12000 km before bending during a gear change. One can imagine it had already suffered a shock from the fall despite the auto-folding position of the Di2 because upon reassembly, with identical screw tightening, the chain tension requirement was quite different on the new one without excessive screwing. (Translated review)

Very reliable shift, as is customary from Shimano. Excellent workmanship and with a good appearance. (Translated review)

The product perfectly conforms to the description on the site and was delivered quickly. No assembly issues on the bike but I regret that the components of the Shimano di2 are so fragile. And expensive ... (Translated review)

Very good original derailleur, received quickly and well packaged. (Translated review)

I replaced my old 6870 with a short cage with this 8050 with a medium cage to switch to a 34-tooth cassette. It works perfectly and is compatible with the shifters and the 6870 system. (Translated review)

I broke mine during a fall. I managed to order it in these difficult times and cheaper than the competition. I recommend! Always very fast delivery! (Translated review)

The product arrived in Spain in two days. I had some doubts about it, but the customer service clarified them quickly. Therefore, the service has been excellent. (Translated review)

Very good quality, mounted on a 34 teeth, impeccable. (Translated review)

In place for 2 years on the bike, nothing to report, it works perfectly (Translated review)