Shimano Ultegra vs 105 Di2

Shimano stands as a towering figure in the cycling world, celebrated for its premium drivetrains and groupsets. Among its most acclaimed products are the Ultegra and 105 groupsets, particularly their latest 12-speed electronic versions.

While Ultegra is electronic-only, 105 is offered in both mechanical and electronic versions, the latter called 105 Di2 and it's the electronic version we'll concentrate on here.

Both Ultegra and 105 Di2 offer cyclists seamless and exact gear transitions. However, despite their similarities, they are designed to meet the varied needs and performance aspirations of different cyclists, thanks to several distinguishing features. 

The most apparent difference between Ultegra R8170 and 105 Di2 R7170 is their position in Shimano's road groupset hierarchy. The Ultegra series sits above the 105 series in terms of performance, offering higher precision, lighter weight, and often more advanced features.

In fact, it offers much of the functionality and many of the configuration options of Shimano's top spec groupset, Dura-Ace, just with a bit more weight and a much lower price, as we explain in our comparison of Dura-Ace vs Ultegra.

Dura-Ace, Ultegra, 105 Di2 and 105 are Shimano's only 12-speed groupsets. Sitting below them is CUES, which is available as 9, 10 or 11-speed options.

Material and Weight: 

Typically, Ultegra components are constructed using lighter and more advanced materials compared to their 105 counterparts. This translates to a weight advantage for the Ultegra Di2 groupset. While the exact weight difference may vary depending on specific components, Ultegra Di2 is lighter overall, appealing to riders who prioritise weight savings for improved performance. 

Total system weights for both options may seem small - effectively another full water bottle. However, as you're conquering that notorious mountain pass or pushing for your next QOM/KOM, there might just be that little whisper in the back of your mind. You know, the one that playfully pokes at you, wondering if you should have gone for just that slightly lighter option. Would I have been faster? Would this have been easier? 

Finish and Aesthetics:
Another aspect where Ultegra distinguishes itself is in its finish and aesthetics. Ultegra components tend to feature sleeker designs and more refined finishes compared to 105 components, which may have a more utilitarian appearance. While this doesn't directly affect performance, it can be a factor for cyclists who value the visual appeal of their bike components. Admittedly both options are great-looking groupsets, however for me Ultegra still has the edge.

Price:
Now, let's talk about the elephant in the room: cost. Upgrading to Ultegra from 105 Di2 is a bit like choosing between a standard and a first-class ticket. Both will get you to your destination, but one does it with a bit more flair and comfort. If your wallet is feeling heavy and you fancy those little luxuries, Ultegra might just be your ticket to ride.

Otherwise, 105 Di2 offers incredible value, proving that you don't need to spend a fortune to enjoy the journey. You can see get the benefits of electronic shifting but at a more affordable price. 

Performance and Features:
While both Ultegra R8170 and 105 Di2 R7170 offer electronic shifting with the same number of gears (12-speed), there are differences in performance and features between the two.

Ultegra components often incorporate technologies and innovations trickled down from Shimano's top-tier Dura-Ace groupset, resulting in smoother shifting, faster response times, and overall superior performance compared to 105 components. That includes the use of Hyperglide+ on the Ultegra cassette and chain, as against standard Hyperglide for 105. Shimano claims that Hyperglide+ offers faster, more accurate shifting and better chain retention. 

Additionally, Ultegra Di2 offers more customisation options, advanced programming features and satellite buttons for fine-tuning the shifting experience to individual preferences. There's a rim brake option that isn't available for 105 Di2.

SHIMANO 105 DI2

• Target Audience: Enthusiast cyclists seeking high performance without the premium price tag.
• Key Features: Reliable shifting, durability, and slightly heavier than Ultegra.
• Benefits: Offers a balance between performance and value, making it ideal for those who enjoy cycling recreationally or competitively on a budget.

ULTEGRA DI2 

• Target Audience: Serious and competitive cyclists looking for higher performance and lighter weight.
• Key Features: Lighter than 105 Di2 with more refined shifting mechanics and marginally better durability. Supports satellite shifters.
• Benefits: Provides a near-professional level of performance with a focus on weight reduction and efficiency, suitable for racing.
  

In summary, while both Shimano Ultegra and 105 Di2 offer electronic shifting technology with 12-speed gearing, there are notable differences between the two groupsets in terms of performance, weight, aesthetics, price, and features.

Ultegra Di2 stands out as the higher-end option, offering superior performance, lighter weight, and more advanced features, albeit at a higher price. On the other hand, 105 Di2 provides a more budget-friendly alternative without compromising on the benefits of electronic shifting technology, making it an attractive choice for cost-conscious cyclists or those seeking excellent value for money.

 Read next: Dura-Ace vs Ultegra.