bike geometry

Ridley ASTR RS 2026

Compare size-specific bike geometry, including reach, stack, angles, wheelbase and the measurements that influence fit and handling.

Ridley › ASTR RS › Standard › ASTR RS

ASTR RS 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 Ridley ASTR RS 2026?

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 RS geometry	XS	376.3 mm	RideDNA-derived
ASTR RS geometry	L	419.4 mm	RideDNA-derived
ASTR RS geometry	M	406.2 mm	RideDNA-derived
ASTR RS geometry	S	392.2 mm	RideDNA-derived
ASTR RS geometry	XL	431.7 mm	RideDNA-derived

What is the stack of the Ridley ASTR RS 2026?

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 RS geometry	XS	536.3 mm	RideDNA-derived
ASTR RS geometry	L	595 mm	Manufacturer-published
ASTR RS geometry	M	571.3 mm	RideDNA-derived
ASTR RS geometry	S	550.5 mm	RideDNA-derived
ASTR RS geometry	XL	618.7 mm	RideDNA-derived

What is the effective top tube of the Ridley ASTR RS 2026?

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 RS geometry	XS	525 mm	Recorded geometry
ASTR RS geometry	L	590 mm	Recorded geometry
ASTR RS geometry	M	570 mm	Recorded geometry
ASTR RS geometry	S	550 mm	Recorded geometry
ASTR RS geometry	XL	615 mm	Recorded geometry

What is the head tube angle of the Ridley ASTR RS 2026?

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 RS geometry	XS	71 °	Recorded geometry
ASTR RS geometry	L	71.5 °	Recorded geometry
ASTR RS geometry	M	71.5 °	Recorded geometry
ASTR RS geometry	S	71 °	Recorded geometry
ASTR RS geometry	XL	71.5 °	Recorded geometry

What is the seat tube angle of the Ridley ASTR RS 2026?

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 RS geometry	XS	74.5 °	Recorded geometry
ASTR RS geometry	L	74 °	Recorded geometry
ASTR RS geometry	M	74 °	Recorded geometry
ASTR RS geometry	S	74 °	Recorded geometry
ASTR RS geometry	XL	73.5 °	Recorded geometry

What is the trail of the Ridley ASTR RS 2026?

Trail is the ground distance between the steering-axis intercept and the front tire contact point. Also searched as fork trail, mechanical trail.

Configuration	Size	Trail	Source
ASTR RS geometry	XS	71.4 mm	RideDNA-derived
ASTR RS geometry	L	68.1 mm	RideDNA-derived
ASTR RS geometry	M	68.1 mm	RideDNA-derived
ASTR RS geometry	S	71.4 mm	RideDNA-derived
ASTR RS geometry	XL	68.1 mm	RideDNA-derived

What is the wheelbase of the Ridley ASTR RS 2026?

Wheelbase is the distance between the front and rear wheel axles. Also searched as axle-to-axle length.

Configuration	Size	Wheelbase	Source
ASTR RS geometry	XS	1006.3 mm	RideDNA-derived
ASTR RS geometry	L	1064.4 mm	RideDNA-derived
ASTR RS geometry	M	1043.3 mm	RideDNA-derived
ASTR RS geometry	S	1027.1 mm	RideDNA-derived
ASTR RS geometry	XL	1084.7 mm	RideDNA-derived

What is the chainstay length of the Ridley ASTR RS 2026?

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 RS geometry	XS	425 mm	Recorded geometry
ASTR RS geometry	L	425 mm	Recorded geometry
ASTR RS geometry	M	425 mm	Recorded geometry
ASTR RS geometry	S	425 mm	Recorded geometry
ASTR RS geometry	XL	425 mm	Recorded geometry

What is the bottom bracket drop of the Ridley ASTR RS 2026?

Bottom bracket drop is the vertical distance from the wheel-axle line down to the bottom bracket. Also searched as BB drop.

Configuration	Size	Bottom bracket drop	Source
ASTR RS geometry	XS	75 mm	Recorded geometry
ASTR RS geometry	L	75 mm	Recorded geometry
ASTR RS geometry	M	75 mm	Recorded geometry
ASTR RS geometry	S	75 mm	Recorded geometry
ASTR RS geometry	XL	75 mm	Recorded geometry

What is the bottom bracket height of the Ridley ASTR RS 2026?

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 RS geometry	XS	286 mm	RideDNA-derived
ASTR RS geometry	L	286 mm	RideDNA-derived
ASTR RS geometry	M	286 mm	RideDNA-derived
ASTR RS geometry	S	286 mm	RideDNA-derived
ASTR RS geometry	XL	286 mm	RideDNA-derived

What is the front center of the Ridley ASTR RS 2026?

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 RS geometry	XS	592.8 mm	RideDNA-derived
ASTR RS geometry	L	650.4 mm	RideDNA-derived
ASTR RS geometry	M	629.5 mm	RideDNA-derived
ASTR RS geometry	S	613.4 mm	RideDNA-derived
ASTR RS geometry	XL	670.6 mm	RideDNA-derived

What is the fork offset of the Ridley ASTR RS 2026?

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 RS geometry	XS	50 mm	Manufacturer-published
ASTR RS geometry	L	50 mm	Manufacturer-published
ASTR RS geometry	M	50 mm	Manufacturer-published
ASTR RS geometry	S	50 mm	Manufacturer-published
ASTR RS geometry	XL	50 mm	Manufacturer-published

What is the head tube length of the Ridley ASTR RS 2026?

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 RS geometry	XS	115 mm	Recorded geometry
ASTR RS geometry	L	175 mm	Recorded geometry
ASTR RS geometry	M	150 mm	Recorded geometry
ASTR RS geometry	S	130 mm	Recorded geometry
ASTR RS geometry	XL	200 mm	Recorded geometry

What is the seat tube length of the Ridley ASTR RS 2026?

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 RS geometry	XS	475 mm	Recorded geometry
ASTR RS geometry	L	550 mm	Recorded geometry
ASTR RS geometry	M	520 mm	Recorded geometry
ASTR RS geometry	S	500 mm	Recorded geometry
ASTR RS geometry	XL	575 mm	Recorded geometry

What is the standover height of the Ridley ASTR RS 2026?

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 RS geometry	XS	756.5 mm	RideDNA-derived
ASTR RS geometry	L	821.4 mm	RideDNA-derived
ASTR RS geometry	M	795.2 mm	RideDNA-derived
ASTR RS geometry	S	775.1 mm	RideDNA-derived
ASTR RS geometry	XL	844.7 mm	RideDNA-derived

What is the fork length of the Ridley ASTR RS 2026?

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 RS geometry	XS	390.1 mm	RideDNA-derived
ASTR RS geometry	L	390.1 mm	RideDNA-derived
ASTR RS geometry	M	390.1 mm	RideDNA-derived
ASTR RS geometry	S	390.1 mm	RideDNA-derived
ASTR RS geometry	XL	390.1 mm	RideDNA-derived

What is the wheel flop of the Ridley ASTR RS 2026?

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 RS geometry	XS	22 mm	RideDNA-derived
ASTR RS geometry	L	20.5 mm	RideDNA-derived
ASTR RS geometry	M	20.5 mm	RideDNA-derived
ASTR RS geometry	S	22 mm	RideDNA-derived
ASTR RS geometry	XL	20.5 mm	RideDNA-derived

Geometry

Available sizes: XS, L, M, S, XL.

ASTR RS geometry

Jump to size: XS · S · M · L · XL

ASTR RS geometry geometry by size
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^*	536.3 mm^*	525 mm^‡	71 °^‡	74.5 °^‡	71.4 mm^*†	1006.3 mm^*	425 mm^‡	75 mm^‡†	286 mm^*†	592.8 mm^*†	50 mm	115 mm^‡	475 mm^‡	756.5 mm^*†	390.1 mm^*†	22 mm^*†	†
S	392.2 mm^*	550.5 mm^*	550 mm^‡	71 °^‡	74 °^‡	71.4 mm^*†	1027.1 mm^*	425 mm^‡	75 mm^‡†	286 mm^*†	613.4 mm^*†	50 mm	130 mm^‡	500 mm^‡	775.1 mm^*†	390.1 mm^*†	22 mm^*†	†
M	406.2 mm^*	571.3 mm^*	570 mm^‡	71.5 °^‡	74 °^‡	68.1 mm^*†	1043.3 mm^*	425 mm^‡	75 mm^‡†	286 mm^*†	629.5 mm^*†	50 mm	150 mm^‡	520 mm^‡	795.2 mm^*†	390.1 mm^*†	20.5 mm^*†	†
L	419.4 mm^*	595 mm	590 mm^‡	71.5 °^‡	74 °^‡	68.1 mm^*†	1064.4 mm^*	425 mm^‡	75 mm^‡†	286 mm^*†	650.4 mm^*†	50 mm	175 mm^‡	550 mm^‡	821.4 mm^*†	390.1 mm^*†	20.5 mm^*†	†
XL	431.7 mm^*	618.7 mm^*	615 mm^‡	71.5 °^‡	73.5 °^‡	68.1 mm^*†	1084.7 mm^*	425 mm^‡	75 mm^‡†	286 mm^*†	670.6 mm^*†	50 mm	200 mm^‡	575 mm^‡	844.7 mm^*†	390.1 mm^*†	20.5 mm^*†	†

Length measurements are in millimeters; HTA and STA are in degrees. ETT means effective top tube. Values prioritize RideDNA calculations. * RideDNA calculated (including corrections where published values differ). Unmarked values are manufacturer-published; matching independently calculated values are identified in their source notes. † Manufacturer did not publish this dimension; † alone means no reliable value is available. ‡ Staff reference or source not confirmed; see the source note. Open Geometry Audit for the original published values, calculated geometry, and deltas.

Size-to-size changes

Differences are calculated from the recorded values; they are not fit recommendations.

ASTR RS geometry: XS → S — Reach +15.9 mm, Stack +14.2 mm, ETT +25 mm, HTA +0 °, STA -0.5 °, Trail +0 mm, Wheelbase +20.8 mm, Chainstay +0 mm, BB drop +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 RS geometry: S → M — Reach +14 mm, Stack +20.8 mm, ETT +20 mm, HTA +0.5 °, STA +0 °, Trail -3.3 mm, Wheelbase +16.2 mm, Chainstay +0 mm, BB drop +0 mm, BB height +0 mm, Front center +16.1 mm, Fork offset +0 mm, Head tube +20 mm, Seat tube +20 mm, Standover +20.1 mm, Fork length +0 mm, Wheel flop -1.5 mm
ASTR RS geometry: M → L — Reach +13.2 mm, Stack +23.7 mm, ETT +20 mm, HTA +0 °, STA +0 °, Trail +0 mm, Wheelbase +21.1 mm, Chainstay +0 mm, BB drop +0 mm, BB height +0 mm, Front center +20.9 mm, Fork offset +0 mm, Head tube +25 mm, Seat tube +30 mm, Standover +26.2 mm, Fork length +0 mm, Wheel flop +0 mm
ASTR RS geometry: L → XL — Reach +12.3 mm, Stack +23.7 mm, ETT +25 mm, HTA +0 °, STA -0.5 °, Trail +0 mm, Wheelbase +20.3 mm, Chainstay +0 mm, BB drop +0 mm, BB height +0 mm, Front center +20.2 mm, Fork offset +0 mm, Head tube +25 mm, Seat tube +25 mm, Standover +23.3 mm, Fork length +0 mm, Wheel flop +0 mm

RideDNA-derived values

These deterministic calculations use the recorded inputs above. They are separate from recorded facts and are not fit recommendations.

ASTR RS geometry size XS stack Reach Ratio: 1.43
ASTR RS geometry size L stack Reach Ratio: 1.42
ASTR RS geometry size M stack Reach Ratio: 1.41
ASTR RS geometry size S stack Reach Ratio: 1.4
ASTR RS geometry size XL stack Reach Ratio: 1.43