bike geometry
ASTR 2026
Compare size-specific bike geometry, including reach, stack, angles, wheelbase and the measurements that influence fit and handling.
Ridley › ASTR › Standard › ASTR
ASTR geometry measurements
Choose the recorded size and configuration. Geometry figures can change by size; RideDNA does not collapse those values into one misleading answer.
What is the reach of the ASTR?
Reach is the horizontal distance from the bottom bracket to the top of the head tube. Also searched as frame reach.
| Configuration | Size | Reach | Source |
|---|---|---|---|
| ASTR geometry | XS | 376.3 mm | RideDNA-derived |
| ASTR geometry | S | 392.2 mm | RideDNA-derived |
| ASTR geometry | M | 406.3 mm | RideDNA-derived |
| ASTR geometry | L | 419.5 mm | RideDNA-derived |
| ASTR geometry | XL | 431.8 mm | RideDNA-derived |
What is the stack of the ASTR?
Stack is the vertical distance from the bottom bracket to the top of the head tube. Also searched as frame stack.
| Configuration | Size | Stack | Source |
|---|---|---|---|
| ASTR geometry | XS | 536 mm | RideDNA-derived |
| ASTR geometry | S | 550.2 mm | RideDNA-derived |
| ASTR geometry | M | 571 mm | RideDNA-derived |
| ASTR geometry | L | 594.7 mm | RideDNA-derived |
| ASTR geometry | XL | 618.5 mm | RideDNA-derived |
What is the effective top tube of the ASTR?
Effective top tube is the horizontal distance between the head-tube and seat-tube centerlines. Also searched as ETT, virtual top tube, horizontal top tube.
| Configuration | Size | Effective top tube | Source |
|---|---|---|---|
| ASTR geometry | XS | 525 mm | RideDNA-derived |
| ASTR geometry | S | 550 mm | RideDNA-derived |
| ASTR geometry | M | 570 mm | RideDNA-derived |
| ASTR geometry | L | 590 mm | RideDNA-derived |
| ASTR geometry | XL | 615 mm | RideDNA-derived |
What is the head tube angle of the ASTR?
Head tube angle describes the steering-axis angle relative to the ground. Also searched as HTA, head angle, steering angle.
| Configuration | Size | Head tube angle | Source |
|---|---|---|---|
| ASTR geometry | XS | 71 ° | RideDNA-derived |
| ASTR geometry | S | 71 ° | RideDNA-derived |
| ASTR geometry | M | 71.5 ° | RideDNA-derived |
| ASTR geometry | L | 71.5 ° | RideDNA-derived |
| ASTR geometry | XL | 71.5 ° | RideDNA-derived |
What is the seat tube angle of the ASTR?
Seat tube angle describes the seat-tube angle relative to the ground. Also searched as STA, seat angle, effective seat angle.
| Configuration | Size | Seat tube angle | Source |
|---|---|---|---|
| ASTR geometry | XS | 74.5 ° | RideDNA-derived |
| ASTR geometry | S | 74 ° | RideDNA-derived |
| ASTR geometry | M | 74 ° | RideDNA-derived |
| ASTR geometry | L | 74 ° | RideDNA-derived |
| ASTR geometry | XL | 73.5 ° | RideDNA-derived |
What is the wheelbase of the ASTR?
Wheelbase is the distance between the front and rear wheel axles. Also searched as axle-to-axle length.
| Configuration | Size | Wheelbase | Source |
|---|---|---|---|
| ASTR geometry | XS | 1006.3 mm | RideDNA-derived |
| ASTR geometry | S | 1027.1 mm | RideDNA-derived |
| ASTR geometry | M | 1043.3 mm | RideDNA-derived |
| ASTR geometry | L | 1064.4 mm | RideDNA-derived |
| ASTR geometry | XL | 1084.7 mm | RideDNA-derived |
What is the chainstay length of the ASTR?
Chainstay length, also called rear center, is the distance from the bottom bracket to the rear axle. Also searched as Chainstay, rear center, rear centre.
| Configuration | Size | Chainstay length | Source |
|---|---|---|---|
| ASTR geometry | XS | 418.3 mm | RideDNA-derived |
| ASTR geometry | S | 418.3 mm | RideDNA-derived |
| ASTR geometry | M | 418.3 mm | RideDNA-derived |
| ASTR geometry | L | 418.3 mm | RideDNA-derived |
| ASTR geometry | XL | 418.3 mm | RideDNA-derived |
What is the bottom bracket height of the ASTR?
Bottom bracket height is the vertical distance from the ground to the bottom bracket. Also searched as BB height.
| Configuration | Size | Bottom bracket height | Source |
|---|---|---|---|
| ASTR geometry | XS | 286 mm | RideDNA-derived |
| ASTR geometry | S | 286 mm | RideDNA-derived |
| ASTR geometry | M | 286 mm | RideDNA-derived |
| ASTR geometry | L | 286 mm | RideDNA-derived |
| ASTR geometry | XL | 286 mm | RideDNA-derived |
What is the front center of the ASTR?
Front center is the distance from the bottom bracket to the front wheel axle. Also searched as front centre.
| Configuration | Size | Front center | Source |
|---|---|---|---|
| ASTR geometry | XS | 592.7 mm | RideDNA-derived |
| ASTR geometry | S | 613.3 mm | RideDNA-derived |
| ASTR geometry | M | 629.4 mm | RideDNA-derived |
| ASTR geometry | L | 650.4 mm | RideDNA-derived |
| ASTR geometry | XL | 670.6 mm | RideDNA-derived |
What is the fork offset of the ASTR?
Fork offset is the perpendicular distance between the steering axis and the front axle. Also searched as fork rake, rake.
| Configuration | Size | Fork offset | Source |
|---|---|---|---|
| ASTR geometry | XS | 50 mm | RideDNA-derived |
| ASTR geometry | S | 50 mm | RideDNA-derived |
| ASTR geometry | M | 50 mm | RideDNA-derived |
| ASTR geometry | L | 50 mm | RideDNA-derived |
| ASTR geometry | XL | 50 mm | RideDNA-derived |
What is the head tube length of the ASTR?
Head tube length is the measured length of the frame's head tube. Also searched as Head tube, head tube.
| Configuration | Size | Head tube length | Source |
|---|---|---|---|
| ASTR geometry | XS | 115 mm | RideDNA-derived |
| ASTR geometry | S | 130 mm | RideDNA-derived |
| ASTR geometry | M | 150 mm | RideDNA-derived |
| ASTR geometry | L | 175 mm | RideDNA-derived |
| ASTR geometry | XL | 200 mm | RideDNA-derived |
What is the seat tube length of the ASTR?
Seat tube length is the recorded length of the frame's seat tube; measurement conventions can differ by manufacturer. Also searched as Seat tube, seat tube, frame size.
| Configuration | Size | Seat tube length | Source |
|---|---|---|---|
| ASTR geometry | XS | 475 mm | RideDNA-derived |
| ASTR geometry | S | 500 mm | RideDNA-derived |
| ASTR geometry | M | 520 mm | RideDNA-derived |
| ASTR geometry | L | 550 mm | RideDNA-derived |
| ASTR geometry | XL | 575 mm | RideDNA-derived |
What is the standover height of the ASTR?
Standover height is the ground-to-top-tube height at the manufacturer's stated measurement point. Also searched as Standover, stand over height, standover clearance.
| Configuration | Size | Standover height | Source |
|---|---|---|---|
| ASTR geometry | XS | 756.4 mm | RideDNA-derived |
| ASTR geometry | S | 775 mm | RideDNA-derived |
| ASTR geometry | M | 795 mm | RideDNA-derived |
| ASTR geometry | L | 821.3 mm | RideDNA-derived |
| ASTR geometry | XL | 844.5 mm | RideDNA-derived |
What is the fork length of the ASTR?
Fork length is the axle-to-crown distance recorded for the fork. Also searched as axle to crown, A2C.
| Configuration | Size | Fork length | Source |
|---|---|---|---|
| ASTR geometry | XS | 389.8 mm | RideDNA-derived |
| ASTR geometry | S | 389.8 mm | RideDNA-derived |
| ASTR geometry | M | 389.8 mm | RideDNA-derived |
| ASTR geometry | L | 389.8 mm | RideDNA-derived |
| ASTR geometry | XL | 389.8 mm | RideDNA-derived |
What is the wheel flop of the ASTR?
Wheel flop is a calculated steering-geometry value based on trail and head tube angle. Also searched as flop.
| Configuration | Size | Wheel flop | Source |
|---|---|---|---|
| ASTR geometry | XS | 22 mm | RideDNA-derived |
| ASTR geometry | S | 22 mm | RideDNA-derived |
| ASTR geometry | M | 20.5 mm | RideDNA-derived |
| ASTR geometry | L | 20.5 mm | RideDNA-derived |
| ASTR geometry | XL | 20.5 mm | RideDNA-derived |
Geometry
Available sizes: XS, S, M, L, XL.
ASTR geometry
Jump to size: XS · S · M · L · XL
| Size | Reach | Stack | ETT | HTA | STA | Trail | Wheelbase | Chainstay | BB drop | BB height | Front center | Fork offset | Head tube | Seat tube | Standover | Fork length | Wheel flop | Max tire |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| XS | 376.3 mm | 536 mm | 525 mm | 71 ° | 74.5 ° | — | 1006.3 mm | 418.3 mm | — | 286 mm | 592.7 mm | 50 mm | 115 mm | 475 mm | 756.4 mm | 389.8 mm | 22 mm | — |
| S | 392.2 mm | 550.2 mm | 550 mm | 71 ° | 74 ° | — | 1027.1 mm | 418.3 mm | — | 286 mm | 613.3 mm | 50 mm | 130 mm | 500 mm | 775 mm | 389.8 mm | 22 mm | — |
| M | 406.3 mm | 571 mm | 570 mm | 71.5 ° | 74 ° | — | 1043.3 mm | 418.3 mm | — | 286 mm | 629.4 mm | 50 mm | 150 mm | 520 mm | 795 mm | 389.8 mm | 20.5 mm | — |
| L | 419.5 mm | 594.7 mm | 590 mm | 71.5 ° | 74 ° | — | 1064.4 mm | 418.3 mm | — | 286 mm | 650.4 mm | 50 mm | 175 mm | 550 mm | 821.3 mm | 389.8 mm | 20.5 mm | — |
| XL | 431.8 mm | 618.5 mm | 615 mm | 71.5 ° | 73.5 ° | — | 1084.7 mm | 418.3 mm | — | 286 mm | 670.6 mm | 50 mm | 200 mm | 575 mm | 844.5 mm | 389.8 mm | 20.5 mm | — |
Length measurements are in millimeters; HTA and STA are in degrees. ETT means effective top tube.
Size-to-size changes
Differences are calculated from the recorded values; they are not fit recommendations.
- ASTR geometry: XS → S — Reach +15.9 mm, Stack +14.2 mm, ETT +25 mm, HTA +0 °, STA -0.5 °, Wheelbase +20.8 mm, Chainstay +0 mm, BB height +0 mm, Front center +20.6 mm, Fork offset +0 mm, Head tube +15 mm, Seat tube +25 mm, Standover +18.6 mm, Fork length +0 mm, Wheel flop +0 mm
- ASTR geometry: S → M — Reach +14.1 mm, Stack +20.8 mm, ETT +20 mm, HTA +0.5 °, STA +0 °, Wheelbase +16.2 mm, Chainstay +0 mm, BB height +0 mm, Front center +16.1 mm, Fork offset +0 mm, Head tube +20 mm, Seat tube +20 mm, Standover +20 mm, Fork length +0 mm, Wheel flop -1.5 mm
- ASTR geometry: M → L — Reach +13.2 mm, Stack +23.7 mm, ETT +20 mm, HTA +0 °, STA +0 °, Wheelbase +21.1 mm, Chainstay +0 mm, BB height +0 mm, Front center +21 mm, Fork offset +0 mm, Head tube +25 mm, Seat tube +30 mm, Standover +26.3 mm, Fork length +0 mm, Wheel flop +0 mm
- ASTR geometry: L → XL — Reach +12.3 mm, Stack +23.8 mm, ETT +25 mm, HTA +0 °, STA -0.5 °, Wheelbase +20.3 mm, Chainstay +0 mm, BB height +0 mm, Front center +20.2 mm, Fork offset +0 mm, Head tube +25 mm, Seat tube +25 mm, Standover +23.2 mm, Fork length +0 mm, Wheel flop +0 mm
RideDNA-derived values
These deterministic calculations use the recorded manufacturer inputs above. They are separate from manufacturer facts and are not fit recommendations.
- ASTR geometry size XS stack Reach Ratio: 1.42
- ASTR geometry size S stack Reach Ratio: 1.4
- ASTR geometry size M stack Reach Ratio: 1.41
- ASTR geometry size L stack Reach Ratio: 1.42
- ASTR geometry size XL stack Reach Ratio: 1.43
Bike details
- competitor Model Id
- 35c70fed-2af0-41ec-b704-1d08c4c82d7b