The ASTR RS is a performance gravel bike developed for modern gravel racing. Recently, these races have become increasingly rough, while riders are going faster than ever, leading to new demands on the bike.
The Astr RS uses aero-optimized tubing and a diffusor fork based on our Falcn RS aero-to-weight study. Additionally, the Astr RS has a confidence-inspiring geometry with a high degree of stability at high speed (longer wheelbase, slacker head angle, deeper BB). The large tire clearance allows fitting the tires required to handle rougher courses.
Riders need to be able to conserve more energy during the race: optimized aero, more comfort, less rolling resistance due to the wider tires, and better climbing performance due to the low weight mean racers will go into the final with more energy in the tank than their adversaries.
The Astr family has a tyre clearance of 52 millimetres on a 1x setup and 47 millimetres on a 2x setup. Our product developers took this decision because the race terrain is getting rougher and riders feel the need to be armed for this. With this, we confirm our role as a trendsetter in the gravel segment.
The fork crown has an integrated diffuser to reduce drag. The airflow passes more easily through fork crown while extra energy is added to it. The result is that the airflow passes the downtube more easily without pushing the bike back. At the same time there is less drag in the area behind the fork and headtube.
Less resistance, more speed!
Modern performance geometry demands more stability due to increasingly rough terrain combined with higher speeds. A 71.5-degree headtube angle ensures you have faster handling. The Astr family features a steeper seat tube (74 degrees), improving climbing performance and power transfer.
The product developers kept the chainstays as short as possible to accommodate tyres up to 52 millimetres without losing the feeling of responsiveness when accelerating. In addition, the bottom bracket is a bit lower. This ensures you have more stability at high speed. Finally, the head height is lower, so you sit more aerodynamically on the bike. In summary, this boils down to a modern competitive geometry, tailor-made for the ambitious gravel racer.
The focus in the road bike market used to be on stiffness versus weight, but has recently shifted to the balance between aero and weight. Ridley decided to combine the best of both worlds with the Astr, which means it has been made as aerodynamic as possible without sacrificing the bike's weight. The Astr has a similar aero performance to the Kanzo Fast and weighs just 890g (in size Medium), meaning cyclists no longer have to choose between lightweight and aero.
The RS in Astr RS stands for 'Racing Sport'. This bike has one goal, to be the best in its class! The heart of the Astr RS is the Elite series carbon frame. With a weight of only 890 grams in size medium, the frame is designed to be as light as possible without sacrificing aerodynamics. This is achieved through the use of sleek tube profiles and a carbon lay-up focused on weight reduction.
Our carbon is manufactured by the world leader: Toray. The Japanese manufacturer is leading in every aspect of carbon development and supplier to absolute world brands in numerous industries.
For the Elite Series, we use every type of carbon available to us: 60T, 50T, 30T, and 24T. The higher the 'tonnage', the higher the tensile strength of the carbon fibers and the more intensive the development and processing. The perfect blend of 24T, 30T, 50T, and 60T carbon is essential. Each type of frame requires a different combination of carbon.
That's why for each bike in the Elite Series, we investigate which zones comfort is essential. In which areas can weight be saved without compromising the characteristics of the bike? Where is stiffness crucial? Time and again, that balance is sought and found. The composition of the carbon, that's where Ridley makes the difference!
Our innovative removable front derailleur clamp ensures a sleek, streamlined appearance when using a 1x setup. In collaboration with Wolf Tooth, we’ve developed a custom chainguide and chain catcher perfectly tailored to fit our frames. To maintain a clean and polished look, we’ve also designed a specialized cover to seamlessly replace the clamp when it’s not in use.
Both our gravel bikes and our all-road bikes are developed in collaboration with the Classified Ridley Team. As a professional gravel team, they have the knowledge and experience in competition and are ideally positioned to assist us in the quest for marginal gains.
The ASTR RS received the Design & Innovation Award at the beginning of 2025. The jury is particularly enthusiastic about our engineers. "The ASTR RS sets a new benchmark in the gravel racing category, combining aero efficiency with off-road prowess. The stiff, aerodynamically- optimised frame and low overall system weight ensure outstanding acceleration, while the rigid front end enables precise handling. With ample tire clearance of up to 52 mm and a progressive geometry, the ASTR RS effortlessly tackles technical sections while remaining stable and controlled on fast descents."
Belgian quality, local service, international prestige. That’s Ridley. We provide you with only the best possible service. That’s why we work very closely with local dealers, each an expert near you.
The universal derailleur hanger (UDH) is the new standard in the cycling world. Not only is this derailleur hanger compatible with all modern shifting groups, it also protects against derailleur breakage and chain drops. In mountain biking, UDH has long been very common, and Ridley is bringing the technology to other segments as well.
| XS | S | M | L | XL | |
|---|---|---|---|---|---|
| A | 765 | 790 | 860 | 890 | 915 |
| B | 475 | 500 | 520 | 550 | 575 |
| C | 525 | 550 | 570 | 590 | 615 |
| D | 115 | 130 | 150 | 175 | 200 |
| E | 74.5 | 74 | 74 | 74 | 73.5 |
| F | 71 | 71 | 71.5 | 71.5 | 71.5 |
| G | 425 | 425 | 425 | 425 | 425 |
| H | 75 | 75 | 75 | 75 | 75 |
| I | 1006 | 1027 | 1043 | 1064 | 1085 |
| J | - | - | - | - | - |
| S | 536 | 550 | 571 | 595 | 619 |
| R | 376 | 392 | 406 | 419 | 432 |
Can’t decide between a few colors or designs? Would you like to see a certain design in more detail? Then check out some of these cool designs, selected to help you choose. Let us inspire you!
How can we help?
The frame needs a 12mm TA with a thread of 1mm (Ridley article code QRET124ZA046)
The uses the SRAM Universal Derailleur Hanger (UDH). This means you will find easily a replacement hanger wherever you are as it is a standardised hanger (Ridley article code HANUDHSRA001)
We use a BB86 press-fit bottom bracket standard on the Fenix SLiC, Fenix Disc, Kanzo Adventure, Kanzo Fast, Grifn, X-Night RS, Falcn (RS), ASTR (RS)
No, the Falcn RS and ASTR RS are only compatible with electronic groupsets of Shimano and Sram.
The offset of the seatpost is 6mm. The aero seatpost is used on the Noah Fast, Noah, Falcn RS, X-Night RS frame platforms.
Yes, there is a zero offset seatpost available.
The integrated seatpost clamp (Ridley article code SPCAER4ZA008) is designed for the aero seatpost of the Falcn RS, X-Night RS and ASTR RS
The tire clearance for the ASTR (RS) is 47mm when using a 2x groupset or 52mm when using a 1x groupset. This is the actual width of the tire on the rim and can be different from what's indicated on the tire.
Frame weight of the ASTR RS is 890gr (+-10%) for an unpainted frame in size M.
The maximum torque to fix the seatpost clamp is 10Nm, like mentionned on the clamp
No, there are no mounting points for mudguards
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