Astr RS
ASTR RS GRX DI2 2x ARS01As(M)
- XS
- S
- M
- L
- XL
About Astr RS
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.
Diffuser fork crown
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!
Aero-To-Weight
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.
Performance geometry
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.
Tire clearance up to 52 millimetres
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.
Ridley Elite Carbon
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!
Removable front derailleur clamp
Race proven gravel
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.
UDH Hanger
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.
Specifications
Frame
ASTR RS, Ultra HM carbon, BB86, TA12x142Material
CarbonFrame Level
Elite SeriesMax Tire Clearance 700c (*)
52mm (1x drivetrain) / 47mm (2x drivetrain)Paint Finish
GlossyFork
ASTR RS, TA 12x100, Integrated forkcrown diffuser; 50mm rake, D-Shape steererGroupset
Shimano GRX800 DI2 2xRear Derailleur
Shimano GRX DI2Crank
Shimano GRX 820 Crank 172.6mm 48-31T 12spCassette
Shimano Ultegra , 11-34Front Derailleur
Shimano GRX Di2 , Braze-onBrake Type
Flat MountFront Wheel
DT Swiss GRC1600 , TA 12x100mm , 42mm deep , 24mm internal widthRear Wheel
DT Swiss GRC1600 , TA 12x142mm , 42mm deep , 24mm internal widthOuter Tyre
Vittoria Terreno Dry TLR , 700x47c , Folding-TLR , Tan WallHandlebar
4ZA Nimbus Integrated 7E8 / Size 100-360/400/NIM01Seatpost
Forza Aero , 6mm Offset , 400mmSaddle
Selle Italia Novus Boost Superflow , Manganese Rails , BlackRange
Gravel
Geometry
What is my size?| 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 |
Reviews
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Help & support
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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