A road bike groupset is the collection of components that make you stop and go – in other words, the drivetrain, shifters and brakes.
Despite the differences between the brands, the components all do the same job, even if there are some subtle variations in how they approach their specific tasks.
We’ll start this buyer’s guide by explaining the different groupsets available in their hierarchies, then go into greater detail on the individual components, and how they differ between brands. We’ll finish by explaining the benefits of the more expensive groupsets and discussing compatibility.
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Happy to talk groupsets? Keep reading.
What is a groupset?
A groupset comprises all the mechanical parts for your bike – so basically everything except the frame, fork, wheels, handlebars, seatpost and saddle. You can buy a complete groupset or the individual components and there’s some possibility to mix and match between groupsets, although many items are not intercompatible.
When you buy a new bike, a bike maker will often sub in some cheaper parts with a groupset, so you might for example get a chainset that’s from a different level or even a different brand from the rest of the groupset.
The components of a full groupset are:
- Bottom bracket (the bearings in the frame on which the chainset turns)
- Brake levers/shift levers, usually combined
- Rear derailleur
- Front derailleur
- Cassette (the gear sprockets at the rear of the bike)
There’s an explainer of each component and more groupset specifics later in this post.
Shimano groupsets: different levels explained
Shimano is the oldest and most widely used of the three main brands. It began life in Japan in 1921 when Shozaburo Shimano decided to start making freewheels in a rented corner of a demolished celluloid factory.
Fast-forward to today, and it’s become so successful that Shimano now accounts for half of the global bike components industry.
Shimano road groupset hierarchy:
- Claris – 8-speed
- Sora – 9-speed
- Tiagra – 10-speed
- 105 – 11-speed
- Ultegra – 11-speed
- Ultegra Di2 – 11-speed electronic
- Dura-Ace – 11-speed
- Dura-Ace Di2 – 11-speed electronic
Shimano gravel groupset hierarchy:
- GRX RX400 – 10-speed
- GRX RX600 – 11-speed
- GRX RX810 – 11-speed
- GRX RX815 – 11-speed electronic
Entry-level Shimano groupsets: Claris, Sora and Tiagra
The Shimano component range starts with the budget-priced Claris, which is usually found on the most affordable bikes available.
Claris is an 8-speed system (eight gears at the rear) combined with either a double or triple crankset (two or three gears at the front).
Next is Sora, which can also be found on entry-level bikes and is a 9-speed system available in either standard double cranksets or a wide-range triple.
Then comes Tiagra, a 10-speed groupset that offers a near-105 experience, but economises in specific areas, for example with one-piece brake pads rather than higher quality cartridge pads.
Since 2019, Tiagra has included its own hydraulic disc brakes with levers that resemble those of 105. These replaced the lumpy non-series RS405 option.
The latest Shimano Tiagra 4700 groupset deals
Performance Shimano groupsets: 105 and Ultegra
Shimano 105 is the most affordable performance-focused groupset from the Japanese firm, and comes on many mid-market road bikes.
This 11-speed group is considered by many riders to be the best combination of performance, durability and value.
The launch of the latest 105 R7000 groupset brought matching hydraulic levers and disc brakes. Previously, the unlovely RS505 levers were considered 105-equivalent.
The latest Shimano 105 R7000 groupset deals
Shimano Ultegra sits one level below the professional-level Dura-Ace.
This 11-speed group has many of the same design features as the range topping Dura-Ace and offers all the performance most riders will ever need, but is slightly heavier than Dura-Ace.
Like Dura-Ace, Ultegra includes both Di2 electronic shifting and hydraulic disc options in addition to traditional mechanical shifting and rim brakes.
Ultegra also offers an RX clutch-equipped versions of its mechanical and electronic derailleurs, which are ideal for gravel and adventure bikes. Dedicated gravel functionality can be found with Shimano’s GRX range (see below).
The latest Shimano Ultegra R8000 groupset deals
Pro-level Shimano groupsets: Dura-Ace
Shimano Dura-Ace is the pinnacle of Shimano’s range and features on many top-level pro machines.
It offers 11-speed gearing and combines top-end design with lightweight materials, such as high-grade alloys, carbon fibre and titanium.
It is available in rim brake, disc brake, mechanical shifting and Di2 electronic shifting configurations. There is also an optional power meter, the R9100-P.
Shimano is the only brand at present whose range-topping groupset is still 11-speed. A new 12-speed, possibly wireless, electronic groupset has been in the rumour mill for several years, but as at April 2021 had yet to make an appearance.
The latest Shimano Dura-Ace R9100 groupset deals
- Shimano Dura-Ace R9100 review
- Shimano Dura-Ace R9100-P power meter review
- Shimano Dura-Ace Di2 R9170 review
Shimano GRX gravel components
In May 2019, Shimano announced a range of components under the name GRX aimed at gravel, adventure and bikepacking.
GRX offers lower gears better suited to these riding niches and, in a first for Shimano, ready-made 1× gearing options (i.e. with a single chainring at the front).
GRX isn’t a groupset per se, it’s a range of components that complements Shimano’s existing groupsets, with components at Tiagra, 105, Ultegra and Ultegra Di2 levels. The naming scheme looks like this:
- Tiagra level: RX400
- 105 level: RX600
- Ultegra level: RX800 (Ultegra mechanical shifters are ST-RX810, Ultegra Di2 shifters are ST-RX815)
GRX includes dedicated hydraulic levers, cyclocross-style inline levers, clutch-equipped Shadow RD+ rear derailleurs, front derailleurs and 1× and 2× cranks.
The latest Shimano GRX groupset deals
SRAM groupsets: different levels explained
SRAM came to the fore during the mountain biking boom of the late eighties and established itself off the back of its lightweight GripShift shifters.
SRAM introduced its lightweight RED road groupset in 2007 and now produces an extensive range of components for road and cyclocross bikes alongside its MTB offering.
SRAM’s road groupset range comprises four main groups: Apex, Rival, Force and RED (in ascending order of price). All of its road groupsets now include a hydraulic disc brake option. Its three top-tier groupsets – Rival, Force and RED – are also available in 12-speed wireless electronic variants.
SRAM groupset hierarchy:
- Apex – 10-speed
- Apex 1 – 11-speed
- Rival – 11-speed
- Rival eTap AXS – 12-speed wireless electronic
- Force – 11-speed
- Force eTap AXS – 12-speed wireless electronic
- RED – 11-speed
- RED eTap – 11-speed
- RED eTap AXS – 12-speed wireless electronic
Entry-level SRAM groupsets: Apex
Apex is a 10-speed group that features SRAM’s WiFli system. WiFli offers a wide gear range – between 11 and 32 teeth – for the rear cassette (certain SRAM road derailleurs will go as high as a 36t big cog).
That allows SRAM to offer the wide range of gears usually found by using a triple front chainring setup without the extra weight and complexity of a triple. Once a unique selling point for SRAM, other manufacturers are now offering similar setups.
SRAM also offers its Apex group in 1×11 gearing, calling it Apex 1. That is to say, just one chainring at the front and 11 gears at the rear. An Apex 1 rear derailleur can accommodate a cassette with a large 42-tooth cog.
The latest SRAM Apex groupsets deals
Performance SRAM groupsets: Rival, Rival eTap AXS, Force, and Force eTap AXS
Next up the line is Rival, which can also use a wide range WiFli rear derailleur and cassette, but is made from lighter materials than Apex.
Rival is by far the most popular SRAM drivetrain on road bikes and is 11-speed. It can be found with a more common two chainrings at the front (2×11) or just one (1×11).
In 2021 SRAM launched Rival eTap AXS. It adds a third tier to SRAM’s wireless electronic 12-speed groupset line-up and uses much of the same tech as SRAM’s pricier options, offering app-based configuration via a smartphone and a power meter. It’s the cheapest option if you want to go electronic, significantly undercutting Shimano Ultegra Di2.
The latest SRAM Rival groupset deals
Going up in spec one level, SRAM’s Force group uses lightweight materials such as high-grade alloys and carbon fibre to be a very competitive gear setup.
Like Rival, it’s an 11-speed groupset that can be configured with two chainrings at the front for more gearing range, or one chainring at the front for simplicity. It is still a very popular OEM spec option on gravel and cyclocross bikes.
The latest SRAM Force groupset deals
In 2019, SRAM added Force eTap AXS to its range, a 12-speed wireless groupset which competes directly with Shimano Ultegra Di2 and offers a power meter option.
Force eTap AXS was initially launched as a pure road groupset but, in 2020, SRAM added lower and wider-range gearing options to cater to gravel and adventure riders. These compete directly with Shimano’s GRX range.
The latest SRAM Force eTap AXS groupset deals
Pro-level SRAM groupsets: RED, RED eTap and RED eTap AXS
SRAM’s RED group is a proven pro-level 11-speed groupset and has been ridden to victory in the Tour de France on numerous occasions. It was launched as a direct competitor to Shimano Dura-Ace and Campagnolo Super Record.
SRAM RED components use super-light materials throughout, including high-grade alloys, plenty of carbon-fibre, titanium and even ceramic bearings. SRAM RED is also available in a WiFli option, allowing for an ultra-wide range of gears.
Of all the top-of-the-range groups, SRAM RED is almost certainly the lightest on the market at 1,747g. Note that it’s difficult to make precise weight comparisons between groupsets because there’s no standard for how to weigh one.
SRAM RED eTap launched in 2015, a wireless electronic version of the 11-speed RED groupset. Though it has since been superseded by the 12-speed RED eTap AXS, it is still supported by SRAM, with an updated rear derailleur released as recently as September 2020.
The latest SRAM Red eTap groupset deals
In 2019, it was replaced by the all-new and significantly refined RED eTap AXS – SRAM’s first 12-speed road groupset, which is available in disc (HRD) and rim brake options. As with Force eTap AXS, RED eTap AXS now offers wider gear range, handling cassettes up to 10-36. There are power meter and power meter upgrade options available.
Campagnolo groupsets: different levels explained
Italy’s Campagnolo arrived in 1933, after founder Tullio Campagnolo’s frustrated attempts to remove a rear wheel during a race inspired him to design the quick-release lever.
It is perhaps the most storied of cycling brands thanks to its association with so many of the sport’s greats – Fausto Coppi, Gino Bartali, Jacques Anquetil, Eddy Merckx, Bernard Hinault, Miguel Indurain… As such, Campagnolo is often the choice of dyed-in-the-wool aficionados and bike collectors and those who think an Italian bike must have an Italian groupset.
Campagnolo groupset hierarchy:
- Centaur – 11-speed
- Chorus – 12-speed
- Record – 12-speed
- Record EPS – 12-speed electronic
- Super Record – 12-speed
- Super Record EPS – 12-speed electronic
Campagnolo gravel groupset:
- Ekar – 13-speed
Entry-level Campagnolo groupsets: Centaur
Campagnolo groupsets start higher up the overall hierarchy than the competition, so you’re unlikely to find the Italian brand on bikes that cost less than £1,000 / $1,200 / AU$1,900.
The entry-level Centaur groupset sits around the same area as Shimano 105 or SRAM Rival. It’s 11-speed and made from lightweight alloys.
Performance Campagnolo groupsets: Chorus
Sitting just below the range-topping Campagnolo Record family is the 12-speed Chorus. It uses light alloys, carbon fibre and titanium in its construction, and sits between Shimano Ultegra and Dura-Ace, or SRAM Force and SRAM RED.
Chorus now offers a hydraulic disc brake option and handles cassettes with up to 11-34 tooth range to compete with SRAM and Shimano.
The latest Campagnolo Chorus groupset deals
Pro-level Campagnolo groupsets: Record and Super Record
Campagnolo Record is the a premium mechanical groupset from the Italian brand. It uses high-grade carbon fibre in its construction combined with lightweight alloys and titanium.
The latest Campagnolo Record groupset deals
Campagnolo also offers an even higher-level groupset in the form of Super Record. While essentially the same as Record, it uses even fancier materials to lighten and enhance each and every part. It is usually only found on the most expensive pro-level road machines.
The latest Campagnolo Super Record groupset deals
Both Record and Super Record are now available with Campagnolo’s hydraulic brakes as an option.
Electronic Campagnolo EPS groupsets
Over the last few years, Campagnolo has offered a number of electronic groupsets under the name EPS (short for Electronic Power Shift).
At one time there were Chorus, Record and Super Record 11-speed EPS groupsets but now the only current EPS offering is 12-speed Super Record EPS (and its disc counterpart).
Just like Shimano, the EPS groupsets share the same crankset, cassette, chain and brakes of the respective mechanical groupset (so these Super Record EPS components are the same as Super Record).
The latest Campagnolo Super Record EPS groupset deals
Campagnolo gravel groupsets
Campagnolo Ekar is the brand’s 1x-specific 13-speed groupset, with mechanical shifting, that is designed explicitly with gravel and adventure riding in mind.
With cassettes that start with a diminutive 9-tooth cog, Ekar matches the range of 2× drivetrains “without compromise”.
Campagnolo also claims Ekar is the lightest gravel-specific groupset out there, weighing in at a claimed 2,385g for the complete package.
Road bike groupset components
Now that we know how the different groupsets stack up, let’s look at the individual components to be found in a groupset.
We’ll explain the key differences between the different brands and what high-end features to look out for.
Road bike crankset / chainset explained
The crankset (or chainset) is the largest part of any groupset and comprises the chain rings, the cranks and, in most cases these days, the spindle that links the two crank arms together.
Cranksets are grouped into three categories based on the number of chain rings used: double (the most common on the road); single (popular in mountain biking and cyclocross/gravel, and gaining popularity on the road); and triple (an older standard that’s rarely seen on new bikes).
Double crankset variations
- The standard double crankset is most commonly used by pro riders and consists of a 53t big ring and 39t small ring
- The semi-compact crankset – or pro-compact – is 52/36t. This gives you a slightly easier climbing gear while still retaining a big top gear. It is a popular option among competitive amateur riders
- The compact crankset is 50/34t. It has become very popular thanks to its combination of easy gearing and low weight
- Super-compact or sub-compact cranksets offer an even lower gear range on double chainrings such as 48t/32t or 46/30t. These are becoming popular with gravel riders and bikepackers who want low, closely spaced gearing
- SRAM upset the applecart when it went 12-speed and introduced cassettes with a 10t small cog, rather than 11 teeth. That lets it achieve similar gear ratios with smaller chainrings, saving weight and offering even wider ranges. SRAM’s second-tier Force eTap AXS groupset now includes a low-range 43/30t option for example.
- The triple is an older type commonly seen on vintage road bikes and touring bikes. It offers a wide range of gears, but at a weight penalty. It typically combines a 50t outer ring, a 39t middle ring and an inner ring that has just 30 teeth. It is popular with touring cyclists who value a super-small ‘granny ring’ when loaded down with panniers.
- The single-ring crankset – also known as 1× (pronounced ‘one-by’) – has only one chainring. To compensate for the loss of the smaller, inner ring, a 1× crankset is often matched to a wider-range cassette. Single ring cranksets use alternating wide and narrow teeth with a higher profile, to aid chain retention.
Road bike shifters explained
For the most part, modern road bikes use dual-action shifters that incorporate the gear levers into the brake levers.
Each brand has its own spin on the concept, so how you shift gears on a Shimano-equipped bike is slightly different to how you shift on a Campagnolo- or SRAM-equipped bike.
You’ve probably heard about electronic shifting too, which is found on the upper-tier, more expensive groupsets from all three brands and still relies on paddles built into the brake levers, but uses small servomotors in the derailleurs to make them move.
Electronic drivetrains offer consistently precise shifting and lower maintenance than a mechanically actuated drivetrain.
For a full explanation of how the different systems change gear, read our detailed article on how to change gear on a road bike.
Road bike brakes explained
The complications don’t end with the various shift actions and whether they’re mechanically or electronically actuated. The variety of brakes used on road bikes has also grown more complex in the last few years.
In the past, cable-operated, caliper rim brakes were the only type used on road bikes. But recent years have seen road bike braking options expand to take in direct-mount rim calipers, hydraulic rim calipers (these remain exceptionally rare), cable-operated disc brakes and hydraulic disc brakes.
Hydraulic disc brakes are generally considered to be the best all-round option, but which type of brake is best for you is dependent on a number of factors. To learn more about road disc brakes, check out our explainer.
All three groupset makers now offer hydraulic disc brake options alongside rim brakes for the majority of their groupsets and they’re increasingly specced on new bikes.
Road bike derailleurs explained
The derailleurs are the mechanisms – sometimes mech for short – that move the chain from one gear to the next.
The front derailleur does the job for the front chainrings, while the rear derailleur does it for the cassette; both are controlled by the shifters.
Road bike cassettes explained
The cassette is the cluster of sprockets that’s mounted on the rear wheel, and the more sprockets on a cassette, the more ‘speeds’ the groupset is said to have.
So, if there are 10 sprockets, you have a 10-speed groupset; 11 sprockets is an 11-speed groupset, and so on.
(Note: ‘speeds’ only refers to the number of sprockets, not the total number of gears available; for that you’d need to factor in the number of chainrings on the crankset.)
Having more sprockets not only provides you with a wider range of gears, but also means the jumps between them tend to be smaller.
Smaller gaps mean it’s easier to maintain an optimal pedalling cadence as you shift from one gear to the next, and are therefore preferred by the professionals.
For road bikes with a double crankset, 11-28t is probably the most common cassette range, but Shimano, SRAM and Campagnolo all offer a huge range of choices to suit your riding.
It’s becoming more common to see wider range cassettes fitted as standard, with ratios such as 11-32t or even 11-34t appearing on some bikes, while SRAM offers a 10-36t 12-speed cassette in its eTap AXS Force and Rival ranges.
Road bike chains explained
The groupset brand and number of gears dictate the type of chain you require (groupsets with a ‘higher’ number of gears require narrower chains).
More expensive chains also often have smoother, more durable and more corrosion-resistant coatings than their cheaper counterparts.
Additionally, some more expensive chains have the pins and plates drilled to remove weight.
Note that a chain is a wear item and should be replaced at regular intervals. Failure to do this will accelerate wear on your cassette and chainrings.
- How to know when to replace your chain
- Chain lube buyer’s guide: what’s the best chain lube for your bike?
Road bike bottom brackets explained
The bottom bracket contains the bearings on which the crankset spins and it fits into your frame.
Bottom brackets come in many shapes and sizes, but as far as road groupsets are concerned, they all fall into one of two categories: press-fit or threaded.
Threaded bottom brackets screw into your frame on threads. Press fit bottom brackets, as the name suggests, are pressed into the frame and held in place by friction.
Generally speaking, press-fit bottom brackets are less convenient than threaded ones when it comes to maintenance and compatibility, but many manufacturers favour them for purported weight and stiffness benefits, as well as ease of manufacturing.
What do I get with a more expensive road groupset?
Does paying more always bring you improved performance? Maybe, but the higher up the range you go, the smaller those performance benefits become, and the increments become less noticeable, while the kit gets a lot more expensive.
Second-tier groupsets (Shimano Ultegra, Campagnolo Chorus, SRAM Force) are almost as good in functional terms as the pro-level components and considerably cheaper, but they weigh fractionally more and offer a touch less bling.
It was once famously said of bicycle parts: “Strong. Light. Cheap. Pick two.” A lighter bike will always accelerate and climb better than a heavier one, but without giving up strength, something has to be compromised.
Whether you’re looking at groupsets, wheels or even complete bikes, reduced weight is often the major contributor to increased cost.
With all the road groupsets, the more you spend, the lighter they get. The amount of weight that you save for your money diminishes dramatically at the upper end, though.
These weight differences are the result of more expensive materials and refined, or more time-consuming, manufacturing processes.
In addition to further machining, hole-drilling and high precision, more expensive components often use materials such as carbon fibre, titanium, lightweight aluminium and ceramic bearings to achieve the pinnacle in low weight.
If you’re spending more money on a groupset, you’d expect it to outlast a cheaper option. Durability does improve with price, but our experience is that durability also plateaus at the second-tier options, and in some ways, actually starts to decline at the most expensive option.
The more expensive technical components are built with greater precision, refinement and materials that lend themselves to greater longevity. This is apparent in derailleurs and shifters where the cheaper options will develop play and slop overtime, while the better parts often remain like new.
Wear items, such as cassettes and chainrings, however, are often the reverse of this. Cheaper options are made of heavier but more durable steels, while the more expensive versions are sometimes made from lighter but softer aluminium or titanium alloys.
In addition to the benefits of reduced weight, more expensive groupsets find other ways of increasing performance. Most noticeably, higher-priced options provide a smoother, more precise and in some cases quicker shift between gears.
This includes reduced effort at the lever, something that becomes apparent once you’ve been on the bike for a few hours. It’s an area where electronic gears set the benchmark; ultimate precision at the simple push of a button.
Another performance example is increased crankset stiffness to provide crisper shifting and more efficient power transfer from the pedals to the rear wheel. This is achieved with more complex designs and materials that increase strength and stiffness, but don’t add weight.
Braking raises an entire new list of benefits as prices go up. Simply put, more expensive brakes are stronger, offer better feel and control, and stop you with less hand force required.
This difference is much more apparent with rim brakes, though. There’s much less of a jump in performance between low- and high-end hydraulic disc brakes.
Besides offering extra gears, the more expensive groupsets usually get new features first.
Shimano first launched Di2 electronic shifting at the Dura-Ace level, before trickling it down to Ultegra. The same is true of more mundane details – Dura-Ace was the first to get reach adjustment using a built-in screw rather than ugly shims, a feature now found all the way down to Claris level.
Similarly, Shimano and Campagnolo now offer their higher-end cranksets in a universal size that’s cross-compatible with compact, semi-compact or standard sized chainrings. This means that if you ever wish to change your chainring sizes, you can do so without needing a new crankset.
Groupset compatibility issues
It’s worth being aware that not all groupset components from a given manufacturer are compatible with one another, even in cases where it seems like they should be.
Manufacturers tend to update their ranges incrementally over time so you can’t always assume, for example, that one 11-speed component will work with another if they’re not from the same year or groupset.
There are differences in the precise amount of cable pulled by different rim brake levers too, so you may not get optimal performance if you move up the hierarchy when you replace individual parts.
That said, groupsets of a given brand are generally designed to work with each other, providing they share the same number of gears. (i.e. Shimano 11-speed with Shimano 11-speed, Campagnolo 11-speed with Campagnolo 11-speed.)
For specific compatibility queries, we’d suggest you ask your local retailer before buying, consult manufacturer technical documents online, or seek advice on our forum.
Now I know which groupset I want, but not which bike
Hopefully you’ve now got a good understanding of the major groupsets and some idea of what to look for.
If you need some guidance on choosing your next bike, head over to our buyer’s guide to choosing the best road bike for you.