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With an identical feature set to Dura-Ace R9270 Di2, the latest Ultegra is less a budget performance groupset and more a sort of Dura-Ace SE. In the past Ultegra offered a wider range of options than Dura-Ace. For example, you could get an 11-34 cassette where Dura-Ace only went up to 11-30, and there was an Ultegra 14-28 cassette for junior racing that was previously gear-restricted; Ultegra offered a 46/36 chainset for cyclocross racing that wasn't available in Dura-Ace. Now, both groups offer the same options and all the same headline technology.

We have a separate guide on how to use road bike shifters. How do the gears on my bike work? Gear inches As you come to a tight corner, anticipate that you will need to slow down and shift into a lower gear so you can accelerate out of the corner more easily. Your gear development – how far your bike moves with each pedal stroke – is typically described in gear inches, i.e. how many inches your bike will roll forward with each full rotation of your cranks. As explained in the full article above, CUES (which stands for Creating Unique Experiences) will see Shimano amalgamate its mid and budget-range city, touring and mountain bike groupsets (everything with flat bars essentially) into one family of interchangeable 9-speed (U4000), 10-speed (U6000) and 11-speed (U6000 and U8000) components. This means that parts can be mixed and matched, which should make sourcing and fitting replacements much simpler. There are no rim brakes in the range, just hydraulic disc brakes, and you can either have a single chainring or a 2x set-up, leaving no room for the almost extinct triple chainset. Your energy input in each case is roughly the same. The work done is equal to the force times the distance – so if you halve the force input required, you’ll be pedalling twice as fast.Here’s an overview of all Shimano road bike groupsets, with the most expensive at the top of each grouping. The range includes mechanical groupsets for road bikes, using cables to operate the front and rear derailleurs, and electronic groupsets at the top of the range. First introduced in 2008, electronic groupsets have proved to be extremely popular, with precise gear changes, long battery life and good durability. Whether you choose mechanical or electronic ultimately comes down to budget and personal preference. If you’re on the fence between the two, we’ve got a feature that explains why you should switch to electronic shifting. The working principles of planetary gears are based on the interaction and motion of the sun gear, planet gears, and the ring gear. The sun gear serves as the input, transmitting power from the engine, while the ring gear acts as the output, delivering power to the wheels. The planet gears, arranged around the sun gear and meshing with both the sun gear and the ring gear, serve as intermediary gears. The automotive industry continuously evolves, and advancements in transmission technology continue to emerge. One notable development is the rise of Continuously Variable Transmissions (CVTs), which offer infinite gear ratios for enhanced fuel efficiency and smoother acceleration. Additionally, dual-clutch transmissions (DCTs) combine the efficiency of manual transmissions with the convenience of automatic shifting, resulting in improved performance. Moreover, the increasing prevalence of hybrid and electric vehicles is driving innovation in transmission systems, leading to the integration of planetary gears with electric motors and sophisticated control algorithms to optimize efficiency and power delivery.

The 12-speed version of Dura-Ace was at the same time the most anticipated and most predictable product launch of 2021, yet the most surprising. Anticipated because it was preceded by a year of leaks, patent and FCC filings and race appearances; predictable because both SRAM and Campagnolo had already introduced 12-speed systems and Shimano has been making 12-speed mountain bike components since 2018; surprising because there's no mechanical version of 12-speed Dura-Ace, and also because Shimano introduced a 12-speed version of Ultegra Di2 at the same time. More of that later.The main mission of this generation of 105 was excellent performance at a sensible price. It’s a very good-looking groupset too and while it's a bit heavier than Dura-Ace and Ultegra, the performance runs both very close, with good shifting and braking. It’s heavier than Ultegra, but you have to be a weight weenie to worry about that. SDP/SI is a well-known manufacturer of high precision standard and custom gears for a wide range of applications. Our fine to medium pitch gears are manufactured for some of the most demanding customers in the aerospace, defense, and medical industries of today. With service intervals ranging between 3,000 and 5,000km, internal gear hubs are great for the less maintenance-inclined.