bike geometry

BMC Kaius 2026

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

BMC › Kaius › Standard › Kaius

Kaius 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 BMC Kaius 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
Kaius geometry	56	404.4 mm	RideDNA-derived
Kaius geometry	54	400.5 mm	RideDNA-derived
Kaius geometry	58	409.8 mm	RideDNA-derived
Kaius geometry	51	397 mm	Manufacturer-published
Kaius geometry	47	390.1 mm	RideDNA-derived
Kaius geometry	61	414.3 mm	RideDNA-derived

What is the stack of the BMC Kaius 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
Kaius geometry	56	571.1 mm	RideDNA-derived
Kaius geometry	54	551.1 mm	RideDNA-derived
Kaius geometry	58	595.8 mm	RideDNA-derived
Kaius geometry	51	529.9 mm	RideDNA-derived
Kaius geometry	47	510 mm	Manufacturer-published
Kaius geometry	61	620.6 mm	RideDNA-derived

What is the effective top tube of the BMC Kaius 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
Kaius geometry	56	579 mm	Recorded geometry
Kaius geometry	54	569 mm	Recorded geometry
Kaius geometry	58	592 mm	Recorded geometry
Kaius geometry	51	559 mm	Recorded geometry
Kaius geometry	47	546 mm	Recorded geometry
Kaius geometry	61	604 mm	Recorded geometry

What is the head tube angle of the BMC Kaius 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
Kaius geometry	56	72 °	Recorded geometry
Kaius geometry	54	72 °	Recorded geometry
Kaius geometry	58	72 °	Recorded geometry
Kaius geometry	51	71 °	Recorded geometry
Kaius geometry	47	71 °	Recorded geometry
Kaius geometry	61	72 °	Recorded geometry

What is the seat tube angle of the BMC Kaius 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
Kaius geometry	56	73 °	Recorded geometry
Kaius geometry	54	73 °	Recorded geometry
Kaius geometry	58	73 °	Recorded geometry
Kaius geometry	51	73 °	Recorded geometry
Kaius geometry	47	73 °	Recorded geometry
Kaius geometry	61	73 °	Recorded geometry

What is the trail of the BMC Kaius 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
Kaius geometry	56	66.7 mm	RideDNA-derived
Kaius geometry	54	66.7 mm	RideDNA-derived
Kaius geometry	58	66.7 mm	RideDNA-derived
Kaius geometry	51	68 mm	Manufacturer-published
Kaius geometry	47	68 mm	Manufacturer-published
Kaius geometry	61	66.7 mm	RideDNA-derived

What is the wheelbase of the BMC Kaius 2026?

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

Configuration	Size	Wheelbase	Source
Kaius geometry	56	1023.6 mm	RideDNA-derived
Kaius geometry	54	1013.2 mm	RideDNA-derived
Kaius geometry	58	1037.1 mm	RideDNA-derived
Kaius geometry	51	1017.1 mm	RideDNA-derived
Kaius geometry	47	1003.3 mm	RideDNA-derived
Kaius geometry	61	1049.5 mm	RideDNA-derived

What is the chainstay length of the BMC Kaius 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
Kaius geometry	56	420 mm	Recorded geometry
Kaius geometry	54	420 mm	Recorded geometry
Kaius geometry	58	420 mm	Recorded geometry
Kaius geometry	51	420 mm	Recorded geometry
Kaius geometry	47	420 mm	Recorded geometry
Kaius geometry	61	420 mm	Recorded geometry

What is the bottom bracket drop of the BMC Kaius 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
Kaius geometry	56	80 mm	Recorded geometry
Kaius geometry	54	80 mm	Recorded geometry
Kaius geometry	58	80 mm	Recorded geometry
Kaius geometry	51	80 mm	Recorded geometry
Kaius geometry	47	80 mm	Recorded geometry
Kaius geometry	61	80 mm	Recorded geometry

What is the bottom bracket height of the BMC Kaius 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
Kaius geometry	56	271 mm	RideDNA-derived
Kaius geometry	54	271 mm	RideDNA-derived
Kaius geometry	58	271 mm	RideDNA-derived
Kaius geometry	51	271 mm	RideDNA-derived
Kaius geometry	47	271 mm	RideDNA-derived
Kaius geometry	61	271 mm	RideDNA-derived

What is the front center of the BMC Kaius 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
Kaius geometry	56	616.5 mm	RideDNA-derived
Kaius geometry	54	606.2 mm	RideDNA-derived
Kaius geometry	58	629.9 mm	RideDNA-derived
Kaius geometry	51	610.1 mm	RideDNA-derived
Kaius geometry	47	596.4 mm	RideDNA-derived
Kaius geometry	61	642.2 mm	RideDNA-derived

What is the fork offset of the BMC Kaius 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
Kaius geometry	56	45 mm	Manufacturer-published
Kaius geometry	54	45 mm	Manufacturer-published
Kaius geometry	58	45 mm	Manufacturer-published
Kaius geometry	51	50 mm	Manufacturer-published
Kaius geometry	47	50 mm	Manufacturer-published
Kaius geometry	61	45 mm	Manufacturer-published

What is the head tube length of the BMC Kaius 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
Kaius geometry	56	144 mm	Recorded geometry
Kaius geometry	54	123 mm	Recorded geometry
Kaius geometry	58	170 mm	Recorded geometry
Kaius geometry	51	106 mm	Recorded geometry
Kaius geometry	47	85 mm	Recorded geometry
Kaius geometry	61	196 mm	Recorded geometry

What is the seat tube length of the BMC Kaius 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
Kaius geometry	56	493 mm	Recorded geometry
Kaius geometry	54	468 mm	Recorded geometry
Kaius geometry	58	513 mm	Recorded geometry
Kaius geometry	51	452 mm	Recorded geometry
Kaius geometry	47	428 mm	Recorded geometry
Kaius geometry	61	533 mm	Recorded geometry

What is the standover height of the BMC Kaius 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
Kaius geometry	56	766 mm	RideDNA-derived
Kaius geometry	54	744 mm	RideDNA-derived
Kaius geometry	58	787.9 mm	RideDNA-derived
Kaius geometry	51	725.8 mm	RideDNA-derived
Kaius geometry	47	704.4 mm	RideDNA-derived
Kaius geometry	61	809.8 mm	RideDNA-derived

What is the fork length of the BMC Kaius 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
Kaius geometry	56	387 mm	Manufacturer-published
Kaius geometry	54	387 mm	Manufacturer-published
Kaius geometry	58	387 mm	Manufacturer-published
Kaius geometry	51	387 mm	Manufacturer-published
Kaius geometry	47	387 mm	Manufacturer-published
Kaius geometry	61	387 mm	Manufacturer-published

What is the wheel flop of the BMC Kaius 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
Kaius geometry	56	19.6 mm	RideDNA-derived
Kaius geometry	54	19.6 mm	RideDNA-derived
Kaius geometry	58	19.6 mm	RideDNA-derived
Kaius geometry	51	20.9 mm	RideDNA-derived
Kaius geometry	47	20.9 mm	RideDNA-derived
Kaius geometry	61	19.6 mm	RideDNA-derived

Geometry

Available sizes: 56, 54, 58, 51, 47, 61.

Kaius geometry

Jump to size: 47 · 51 · 54 · 56 · 58 · 61

Kaius 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
47	390.1 mm^*	510 mm	546 mm^‡	71 °^‡	73 °^‡	68 mm	1003.3 mm^*	420 mm^‡	80 mm^‡†	271 mm^*†	596.4 mm^*	50 mm	85 mm^‡	428 mm^‡	704.4 mm^*	387 mm	20.9 mm^*†	†
51	397 mm	529.9 mm^*	559 mm^‡	71 °^‡	73 °^‡	68 mm	1017.1 mm^*	420 mm^‡	80 mm^‡†	271 mm^*†	610.1 mm^*	50 mm	106 mm^‡	452 mm^‡	725.8 mm^*	387 mm	20.9 mm^*†	†
54	400.5 mm^*	551.1 mm^*	569 mm^‡	72 °^‡	73 °^‡	66.7 mm^*	1013.2 mm^*	420 mm^‡	80 mm^‡†	271 mm^*†	606.2 mm^*	45 mm	123 mm^‡	468 mm^‡	744 mm^*	387 mm	19.6 mm^*†	†
56	404.4 mm^*	571.1 mm^*	579 mm^‡	72 °^‡	73 °^‡	66.7 mm^*	1023.6 mm^*	420 mm^‡	80 mm^‡†	271 mm^*†	616.5 mm^*	45 mm	144 mm^‡	493 mm^‡	766 mm^*	387 mm	19.6 mm^*†	†
58	409.8 mm^*	595.8 mm^*	592 mm^‡	72 °^‡	73 °^‡	66.7 mm^*	1037.1 mm^*	420 mm^‡	80 mm^‡†	271 mm^*†	629.9 mm^*	45 mm	170 mm^‡	513 mm^‡	787.9 mm^*	387 mm	19.6 mm^*†	†
61	414.3 mm^*	620.6 mm^*	604 mm^‡	72 °^‡	73 °^‡	66.7 mm^*	1049.5 mm^*	420 mm^‡	80 mm^‡†	271 mm^*†	642.2 mm^*	45 mm	196 mm^‡	533 mm^‡	809.8 mm^*	387 mm	19.6 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.

Kaius geometry: 47 → 51 — Reach +6.9 mm, Stack +19.9 mm, ETT +13 mm, HTA +0 °, STA +0 °, Trail +0 mm, Wheelbase +13.8 mm, Chainstay +0 mm, BB drop +0 mm, BB height +0 mm, Front center +13.7 mm, Fork offset +0 mm, Head tube +21 mm, Seat tube +24 mm, Standover +21.4 mm, Fork length +0 mm, Wheel flop +0 mm
Kaius geometry: 51 → 54 — Reach +3.5 mm, Stack +21.2 mm, ETT +10 mm, HTA +1 °, STA +0 °, Trail -1.3 mm, Wheelbase -3.9 mm, Chainstay +0 mm, BB drop +0 mm, BB height +0 mm, Front center -3.9 mm, Fork offset -5 mm, Head tube +17 mm, Seat tube +16 mm, Standover +18.2 mm, Fork length +0 mm, Wheel flop -1.3 mm
Kaius geometry: 54 → 56 — Reach +3.9 mm, Stack +20 mm, ETT +10 mm, HTA +0 °, STA +0 °, Trail +0 mm, Wheelbase +10.4 mm, Chainstay +0 mm, BB drop +0 mm, BB height +0 mm, Front center +10.3 mm, Fork offset +0 mm, Head tube +21 mm, Seat tube +25 mm, Standover +22 mm, Fork length +0 mm, Wheel flop +0 mm
Kaius geometry: 56 → 58 — Reach +5.4 mm, Stack +24.7 mm, ETT +13 mm, HTA +0 °, STA +0 °, Trail +0 mm, Wheelbase +13.5 mm, Chainstay +0 mm, BB drop +0 mm, BB height +0 mm, Front center +13.4 mm, Fork offset +0 mm, Head tube +26 mm, Seat tube +20 mm, Standover +21.9 mm, Fork length +0 mm, Wheel flop +0 mm
Kaius geometry: 58 → 61 — Reach +4.5 mm, Stack +24.8 mm, ETT +12 mm, HTA +0 °, STA +0 °, Trail +0 mm, Wheelbase +12.4 mm, Chainstay +0 mm, BB drop +0 mm, BB height +0 mm, Front center +12.3 mm, Fork offset +0 mm, Head tube +26 mm, Seat tube +20 mm, Standover +21.9 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.

Kaius geometry size 56 stack Reach Ratio: 1.41
Kaius geometry size 54 stack Reach Ratio: 1.38
Kaius geometry size 58 stack Reach Ratio: 1.45
Kaius geometry size 51 stack Reach Ratio: 1.33
Kaius geometry size 47 stack Reach Ratio: 1.31
Kaius geometry size 61 stack Reach Ratio: 1.5