Good to know: Integrated cockpit · Configurable build
Integrated cockpit (a one-piece bar and stem) on at least one build. Changing the length means replacing the whole cockpit, and not every length exists. Check which length the bike actually ships with before you buy.
Configurable build (at least partly: the cockpit or bar width, for example). The stock build below is only one of the options.
Geometry ?
Ridley ASTR / ASTR RS 2026 geometry in sizes XS–XL: stack 536–619 mm, reach 376–432 mm, head angle 71–71.5°.
| XS | S | M | L | XL | |
|---|---|---|---|---|---|
| Stack | 536 mm | 550 mm | 571 mm | 595 mm | 619 mm |
| Reach | 376 mm | 392 mm | 406 mm | 419 mm | 432 mm |
| Head angle | 71° | 71° | 71.5° | 71.5° | 71.5° |
| Seat angle | 74.5° | 74° | 74° | 74° | 73.5° |
| Seat tube (c-t) | 475 mm | 500 mm | 520 mm | 550 mm | 575 mm |
| Head tube | 115 mm | 130 mm | 150 mm | 175 mm | 200 mm |
| Top tube (effective) | 525 mm | 550 mm | 570 mm | 590 mm | 615 mm |
| BB drop | 75 mm | 75 mm | 75 mm | 75 mm | 75 mm |
| Chainstay | 425 mm | 425 mm | 425 mm | 425 mm | 425 mm |
| Wheelbase | 1006 mm | 1027 mm | 1043 mm | 1064 mm | 1085 mm |
| Stock build by size | |||||
| Cranks | – | – | 170 mm | – | – |
| Stem ASTR RS Force XPLR 1x13 | 90 mm | 90 mm | 100 mm | 100 mm | 100 mm |
| Stem ASTR GRX600 1x12 | 90 mm | 90 mm | 100 mm | 100 mm | 110 mm |
| Bar width ASTR RS Force XPLR 1x13 | 360 mm | 360 mm | 360 mm | 360 mm | 360 mm |
| Bar width ASTR GRX600 1x12 | 380 mm | 380 mm | 400 mm | 400 mm | 400 mm |
| Seatpost setback ASTR RS Force XPLR 1x13 | 6 mm | 6 mm | 6 mm | 6 mm | 6 mm |
| Seatpost setback ASTR GRX600 1x12 | 0 mm | 0 mm | 0 mm | 0 mm | 0 mm |
Source: ridley-bikes.com, checked 1 Nov 2026 · bar position: worked out from published data
Older model years in the archive with the same stack, reach and head angle: 2024–2025. Source: granfondo-cycling.com
Corrected values: bar width
M bar width 400 → 360 mm, XS bar width 400 → 360 mm, S bar width 400 → 360 mm, L bar width 400 → 360 mm, XL bar width 400 → 360 mm. The manufacturer gives two widths for these bars: at the hoods and at the drops (the bars are flared). I’d entered the width at the drops by mistake. It’s now the width at the hoods, as for every other bike on sedimi.bike. The bar position isn’t affected. Corrections
Stock build
ASTR RS Force XPLR 1x13
- Groupset
- SRAM Force XPLR 1×13
- Cranks
- SRAM Force XPLR power meter 42T
- Handlebar
- Forza Nimbus Pro
- Seatpost
- Forza Aero
- Saddle
- Selle Italia Novus Boost Superflow
Options when ordering (manufacturer’s default in bold):
| Size | Stem |
|---|---|
| all | 90, 100, 110, 120, 130 mm |
ASTR GRX600 1x12
- Groupset
- Shimano GRX 600 1×12
- Cranks
- Shimano GRX 610 40T
- Stem
- Forza Stratos Pro
- Handlebar
- 4ZA Stratos Pro 400 V1
- Seatpost
- 4ZA Cirrus 27.2
- Saddle
- Selle Italia Model A
Options when ordering (manufacturer’s default in bold):
| Size | Stem |
|---|---|
| all | 80, 90, 100, 110 mm |
Source for all builds: ridley-bikes.com, checked 1 Nov 2026
Frames with similar geometry
Stack and reach within 12 mm of size XS (stack 536 / reach 376 mm).
Stack and reach within 12 mm of size S (stack 550 / reach 392 mm).
Stack and reach within 12 mm of size M (stack 571 / reach 406 mm).
Stack and reach within 12 mm of size L (stack 595 / reach 419 mm).
Stack and reach within 12 mm of size XL (stack 619 / reach 432 mm).
Spotted a mistake or a missing build? Let me know.