Shimano's recent offering in the gravel world, the GRX RX820, is making waves, and it's about time we wrote a review for this fantastic groupset. We received our shipment of the 820s quite a while ago and had time to really test it in tons of terrain over long distances, so we are due for this.
We know that Shimano now has a GRX Di2 version, but we are more into mechanical groupsets (call me “old school”). As a long-distance rider, often in remote areas, I would not put my complete trust in Di2 over multi-day treks, just the way I think… So, as a distance gravel rider, I couldn't wait to get my hands on this groupset to see if it lives up to the hype we have been hearing about over the last year or so.
With Shimano pushing forward into 12-speed territory, the GRX 820 promises improved shifting, excellent braking, and a more comprehensive range of gears, all while keeping things strictly mechanical. But is this latest evolution enough to keep Shimano at the forefront of the gravel game?
Let’s examine the new GRX820 in-depth, exploring its performance, standout features, and whether it's the right choice for gravel riders looking for reliability and versatility on all types of terrain.
What’s New with GRX 820?
At its core, the Shimano GRX 820 is an evolution of the original GRX groupset launched in 2019. This time, Shimano has focused on bringing a 12-speed drivetrain to the gravel scene, offering 1x and 2x options to suit different riding styles. The new 1x configuration, "Unstoppable," includes a 10-51t cassette designed to conquer a wide range of terrains. At the same time, the 2x "Unbeatable" version offers closer spacing for those looking for more traditional gearing. For riders who want a balance between the two, the "Undroppable" setup provides a 1x option with a 10-45t cassette for more versatility.
One of the major highlights of the new GRX 820 is its mechanical setup. In an era when electronic shifting is becoming increasingly common, Shimano's decision to initially stick with a mechanical-only option for this release might seem surprising. Still, it makes sense for us long-distance riders.
However, Shimano has made significant ergonomic and technical improvements to make this mechanical system smoother and more intuitive. The shifters feature a redesigned grip pattern for better control, especially on rough terrain, and the brake callipers have been updated with improved modulation and power for those steep, technical descents.
The 820 also introduces Shimano's latest CL800 rotor technology, which enhances braking performance and reduces noise. As someone who has experienced squeaky brakes at inopportune moments, this feature was an immediate standout.
With these updates, Shimano aims to offer gravel riders a durable, reliable, and versatile groupset for anything from mellow gravel paths to gnarly singletrack.
Installation Characteristics
The GRX 820 installation process will feel quite familiar for those who enjoy working on their bikes. Shimano has kept the traditional mechanical shift cables and standard mounting points, so the setup process remains straightforward for anyone with basic mechanical skills. The hydraulic brake system is also unchanged, so if you've previously worked with Shimano's gravel or road components, you'll find the installation process intuitive.
One noteworthy improvement is the repositioned bleed port on the brake callipers, making brake maintenance much easier for home mechanics. The bleed port is now more accessible, and Shimano has replaced the flat-head screwdriver bolt for the retention pin with an Allen head bolt, which makes the process more user-friendly and reduces the risk of stripped heads. The improved pad clearance is also a welcome update, helping to minimize annoying brake rub after heavy braking sessions.
The 820 is compatible with a wide range of modern frame designs, but it’s worth noting that the mechanical system might pose some challenges for those with fully integrated cable routing. While many high-end gravel bikes are moving towards electronic-only frame designs for cleaner aesthetics, the 820’s mechanical setup still offers a reliable and accessible option for most gravel riders.
Drivetrain Adjustment
Once everything is installed, the drivetrain adjustment is relatively simple. Indexing the gears and aligning the derailleur are straightforward tasks that anyone with some mechanical experience can handle. The 820’s mechanical shifting feels crisp and precise, and adjusting the cable tension to achieve perfect shifting is easy enough with the inline barrel adjusters.
Overall, the installation process for the GRX 820 is a mix of familiar standards and thoughtful improvements that make maintenance and setup more convenient. Shimano has managed to strike a balance between modern features and user-friendly design, making this groupset accessible for both seasoned mechanics and riders new to DIY bike maintenance.
Shifter System (ST-820)
The shifters on the GRX 820 have received some of the most notable updates, focusing on ergonomics and control. Shimano has redesigned the hood grip pattern to provide better control, especially when tackling rough gravel or technical terrain. The new pattern offers a secure grip, whether wearing gloves or riding bare-handed, and the hood shape has been optimized for comfort during long rides.
The clamp angle of the shifters has also been adjusted to work better with flared gravel handlebars. This adjustment ensures that the shifter body sits parallel to the ground, providing a more natural hand position and reducing pressure points. Additionally, Shimano has incorporated a wet-weather grip material on the brake levers, borrowing technology from their fishing division to ensure confident braking even in the most challenging conditions.
While these changes are a welcome improvement, it's worth noting that the shifters are still larger than Shimano's electronic Di2 versions.
Rear Derailleur (RD-RX822-SGS)
The GRX 820’s rear derailleur features Shimano's Shadow RD+ clutch technology, which helps to maintain chain tension and reduce chain slap on rough terrain. This technology is particularly effective for gravel riders tackling technical trails or rocky paths, where chain stability is crucial. The long-cage RD-RX822-SGS derailleur is designed to accommodate the wide 10-51t cassette, making it ideal for riders looking for maximum gear range.
One limitation of the rear derailleur is that it is incompatible with Shimano's flat-bar trigger shifters, which could be a drawback for riders who prefer a flat-bar setup on their gravel bikes. However, the 820 derailleur performs exceptionally well for those using drop bars, providing smooth and reliable shifts across the cassette range.
Crankset (FC-820-1)
The FC-820-1 crankset is available in two chainring sizes: 40t and 42t. This limited selection may not cater to all riders, particularly those who prefer a smaller chainring for steep climbs or a larger one for faster gravel rides. However, the 40t option paired with the 10-51t cassette offers a wide enough range for most gravel adventures, from steep climbs to fast descents.
The crankset features a relatively simple design, which might not appeal to those who prefer more visually striking components. However, the functionality is top-notch, and the chainring’s narrow-wide profile works well to keep the chain secure, even on bumpy terrain. One downside is the lack of an integrated power meter option, which might disappoint riders who rely on power data for training and performance analysis.
Cassette System (CS-M8100-12)
The cassette used in the GRX 820 groupset is borrowed from Shimano's Deore XT mountain bike lineup. The CS-M8100-12 cassette offers a 10-51t range, providing plenty of climbing and high-speed cruising options. Despite being an MTB component, the cassette works seamlessly with the GRX groupset, offering smooth and quiet shifting across the entire range.
One thing to note is that the 10t smallest cog requires a Shimano Micro Spline freehub body. Depending on your current wheelset, you may need to upgrade your hub or even your entire wheelset to accommodate this cassette. However, the wide gear range and smooth performance make it a worthwhile investment for those seeking versatility in their gravel setup.
Chain Design (CN-M8100)
The chain used in the GRX 820 groupset is also derived from Shimano's mountain bike range. The CN-M8100 chain is designed to work seamlessly with the 12-speed drivetrain, offering smooth and reliable shifting. The chamfered edges of the chain help to reduce noise and ensure consistent performance, even in dusty or muddy conditions. Overall, the chain is durable and performs well under various conditions, making it an excellent match for the 820 groupsets.
Brake Calipers and Levers
The GRX 820 groupset features Shimano's latest brake calipers and levers, designed to provide enhanced braking power and modulation. The new callipers use a two-piece construction similar to Shimano's higher-end road offerings, which helps to improve rigidity and heat management. The inclusion of Servo Wave technology ensures that braking power is delivered progressively, giving riders more control, particularly on steep descents or technical sections.
Shimano has also significantly improved by increasing the pad clearance by 10%, reducing the chance of rotor rub after heavy braking. This update is particularly beneficial for gravel riders who may encounter muddy or wet conditions that can cause pads to drag.
The brake lever design incorporates Shimano's wet-weather grip material, which gives the levers a slightly coarse texture for improved grip in wet or sweaty conditions. This thoughtful detail ensures that braking remains consistent, even when conditions are less than ideal.
The callipers are also easier to maintain, thanks to the repositioned bleed port, which makes the bleeding process more straightforward. This is a welcome improvement for home mechanics, allowing for more straightforward brake maintenance without requiring specialized tools. Using an Allen key instead of a flat-head screwdriver for the retention pin further simplifies the process and reduces the risk of damage during maintenance.
Rotor Technology (RT-CL800)
The GRX 820 comes equipped with Shimano's latest RT-CL800 rotors, designed to improve heat dissipation and reduce brake noise. These rotors feature an aluminum carrier that helps to manage heat buildup, ensuring that braking performance remains consistent even during long descents.
The result is quieter braking with less fade, which is particularly important for riders tackling extended downhill sections.
The RT-CL800 rotors are an upgrade over previous models, providing a noticeable reduction in noise and an overall smoother braking experience. This is especially useful for gravel riders who often face mixed conditions, as the rotors maintain their performance regardless of whether wet or dry.
The improved heat management also means that the braking system is less prone to overheating, which can be a concern during long, steep descents.
Overall, the GRX 820's braking system is a standout feature, offering excellent power, modulation, and reliability. Shimano clearly put a lot of thought into making the brakes not only powerful but also easy to maintain, making them an excellent choice for gravel riders who need dependable stopping power in all conditions.
Shifting Performance
The GRX 820's shifting performance is one of the groupset's strongest attributes. The 12-speed system provides a smooth and precise shifting experience, even when the drivetrain is under heavy load.
Whether grinding up a steep climb or accelerating out of a corner, the 820's shifting is consistent and reliable. The mechanical shifters offer a satisfying tactile feel, with each shift providing a noticeable and deliberate click that gravel riders will appreciate.
One key advantage of the 820s shifting system is its ability to maintain performance over rough terrain. Thanks to Shimano's Shadow RD+ clutch technology, the rear derailleur keeps the chain stable, minimizing chain slap and ensuring that shifts are executed cleanly, even on rocky or uneven surfaces.
During testing, I found that the 820 handled everything from loose gravel to technical singletrack without missing a beat.
Braking Performance
The GRX 820's braking performance is equally impressive. Shimano's Servo Wave technology, combined with the improved CL800 rotors, results in powerful and predictable braking that inspires confidence in all conditions. The brakes' modulation allows for fine-tuned control, which is particularly useful when navigating steep descents or technical sections where precise braking is crucial.
The levers' increased pad clearance and wet-weather grip material make the braking system well-suited for various conditions, from dry, dusty trails to muddy or rainy rides. The brakes performed consistently during testing, with no noticeable fade, even on long descents.
The improved heat dissipation of the CL800 rotors also helped maintain braking performance, reducing the risk of overheating during extended braking periods.
Terrain-Specific Performance
The GRX 820 groupset truly shines when tackling varied terrain. Whether on smooth gravel paths, rocky trails, or steep climbs, the 820 delivers reliable performance that adapts to the demands of the terrain.
The 10-51t cassette's wide gear range ensures that riders have the gearing needed for fast sections and challenging climbs. The 1x configuration, in particular, makes shifting simple and intuitive, allowing riders to focus more on the trail ahead rather than worrying about gear combinations.
On technical descents, the combination of Servo Wave braking and Shadow RD+ derailleur technology provides the control and stability needed to navigate tricky sections confidently.
The improved grip on the shifters and levers also contributes to the overall sense of control, even when riding in wet or challenging conditions.
Overall, the GRX 820 offers a well-rounded performance that suits many riding styles and terrains. Whether heading out for a multi-day bikepacking trip or tackling a local gravel race, the 820 has the versatility and reliability needed to handle everything.
Price Analysis
The Shimano GRX 820 groupset is positioned at a competitive price point in the gravel market. A complete setup retails at CTL for around C$1692 (US$1215) for the 1X version and C$1742 (US$1249) for the 2X version. While this is a small step from the previous GRX RX810 model, the added features and improvements justify the price increase for many riders. The 820 offers high-quality components designed to withstand the rigours of gravel riding, making it a solid value for those seeking a dependable and versatile groupset.
In comparison, SRAM’s Apex Eagle 1x setup retails for approximately US$1,020, which makes it a more budget-friendly option for riders looking to enter the gravel scene. However, the GRX 820 offers advantages over Apex, including lighter weight, a more comprehensive gear range, and more refined ergonomics. The Apex AXS XPLR setup is closer in price to the 820, at US$1,409, but it includes electronic shifting, which may appeal to riders who prioritize cutting-edge technology.
Campagnolo's Ekar 1x13-speed groupset is another competitor, priced at around US$1,764. Ekar offers extra gear and is known for its smooth shifting and Italian flair. However, it comes at a premium price, and the GRX 820’s braking performance and familiar Shimano reliability may make it a more appealing option for many gravel riders.
Technical Comparison
Several technical aspects stand out when comparing the GRX 820 to its competitors. The 820's 12-speed mechanical drivetrain provides a wide gear range that rivals many electronic options, while the groupset's weight—at 2,822g—is lighter than SRAM’s Apex Eagle (3,148g). This makes the 820 an attractive choice for those looking to keep their bike weight low for longer rides or racing.
The 820's braking technology also offers a significant advantage. The Servo Wave modulation and improved rotor design deliver superior braking power and control compared to SRAM Apex's braking system. The CL800 rotors and their improved heat dissipation give the 820 an edge, especially for riders tackling long, technical descents.
While SRAM’s Apex AXS XPLR offers electronic shifting, some riders may prefer the simplicity and reliability of a mechanical system, especially for multi-day bikepacking trips where recharging isn’t an option. Campagnolo’s Ekar offers a unique 13-speed setup but lacks some of the braking improvements found in Shimano’s 820.
Feature Comparison
Regarding features, the GRX 820 stands out for its ergonomic improvements and thoughtful design. The redesigned shifters, with their wet-weather grip material and optimized clamp angle, make a noticeable difference in comfort and control, particularly on rough terrain.
The increased pad clearance in the brake callipers also sets the 820 apart from its competitors, offering a quieter and more reliable braking experience.
The 10-51t cassette's wide gear range is ideal for gravel riding, allowing for fast cruising and steep climbs.
While SRAM’s Apex Eagle also offers a wide range, the 820’s combination of smooth shifting and stable chain management gives it an edge. Campagnolo Ekar’s 13-speed setup is unique, but the 820’s balance of features and reliability will be more appealing to many riders.
Strengths
The Shimano GRX 820 is a well-rounded groupset that excels in several key areas. The shifting performance is smooth and reliable, even under heavy loads or on rough terrain, and the braking system offers excellent power and modulation. The ergonomic improvements to the shifters and the increased pad clearance in the brake callipers make the 820 a joy to use, particularly on long or challenging rides.
The 10-51t cassette's wide gear range ensures that riders have the versatility they need for a variety of terrains, from steep climbs to fast descents. The 820 is also competitively priced, offering solid value for riders looking for a dependable and high-performance gravel groupset.
Limitations
While the 820 has many strengths, it also has a few limitations. The lack of an integrated power meter option may be a drawback for riders who rely on power data for training. Additionally, the limited chainring options (40t and 42t) may not cater to all riders, particularly those who prefer a smaller chainring for steep climbs or a larger one for high-speed gravel racing.
The shifters are also bulkier than Shimano's electronic Di2 versions, which may not appeal to riders who prioritize a sleek, streamlined look. However, the added size provides better leverage for braking and shifting, which benefits technical descents.
User Assessment
The Shimano GRX 820 is ideal for gravel enthusiasts looking for a reliable, versatile, high-performance groupset. Its mechanical design suits adventure cyclists and bikepackers who need a dependable system that doesn’t require frequent recharging. The 820's wide gear range and excellent braking performance make it a great choice for riders tackling mixed terrain and long-distance adventures.
For value-conscious riders, the 820 offers an excellent balance of performance and price. While it may not have the latest electronic features, it more than makes up for it with its rugged reliability and thoughtful design features that enhance the riding experience.
The GRX 820 shines in a variety of use case scenarios, including:
The Shimano GRX 820 is a fantastic groupset that delivers reliable performance across various riding styles and conditions. Whether you're a gravel racer, an adventure cyclist, or a weekend warrior, the 820 has the versatility and quality needed to enhance your gravel riding experience.
We at CTL, after a lot of riding on the 820, has our vote!