	47	51	54	56	58	61
Stack	521mm	541mm	561mm	581mm	606mm	631mm
Reach	385mm	392mm	396mm	400mm	405mm	409mm
Stack to Reach Ratio	1.35:1	1.38:1	1.42:1	1.45:1	1.5:1	1.54:1
Seat Tube Length, C-T	429mm	449mm	471mm	485mm	509mm	533mm
Top Tube Length, Effective/Horizontal HT Top	531mm	544mm	559mm	569mm	587mm	598mm
Top Tube Slope	12.2deg	12deg	11.7deg	12.2deg	12.1deg	12.1deg
Head Tube Angle	70.8deg	70.8deg	70.8deg	71.6deg	71.6deg	71.6deg
Seat Tube Angle	74.3deg	74.3deg	73.8deg	73.8deg	73.8deg	73.8deg
Head Tube Length	88mm	109mm	126mm	147mm	173mm	199mm
Bottom Bracket Drop	79mm	79mm	79mm	79mm	79mm	79mm
Bottom Bracket Height	277mm	277mm	277mm	277mm	277mm	277mm
Chainstay Length	425mm	425mm	425mm	425mm	425mm	425mm
Chainstay Length Horizontal	417.6mm	417.6mm	417.6mm	417.6mm	417.6mm	417.6mm
Front-Center	597mm	611mm	614mm	619mm	633mm	645mm
Front-Center Horizontal	592.4mm	606.4mm	609.4mm	614.4mm	627.4mm	640.4mm
Wheelbase	1010mm	1024mm	1027mm	1032mm	1045mm	1058mm
Fork Offset/Rake	50mm	50mm	50mm	45mm	45mm	45mm
Fork Length (Axle-To-Crown)	397mm	397mm	397mm	397mm	397mm	397mm
Trail	71mm high	71mm high	71mm high	71mm high	71mm high	71mm high
Mechanical Trail	67.1mm	67.1mm	67.1mm	67.4mm	67.4mm	67.4mm
Wheel Flop	22.1mm	22.1mm	22.1mm	21.3mm	21.3mm	21.3mm
Standover Height	739mm	758mm	779mm	795mm	815mm	838mm
Tire to Pedal Spindle	76mm 165 mm cranks	90mm 165 mm cranks	88mm 170 mm cranks	93mm 170 mm cranks	104.5mm 172.5 mm cranks	116.5mm 172.5 mm cranks
Pedal Spindle to Ground Clearance	112mm 165 mm cranks	112mm 165 mm cranks	107mm 170 mm cranks	107mm 170 mm cranks	104.5mm 172.5 mm cranks	104.5mm 172.5 mm cranks

	47	51	54	56	58	61
Wheel Size	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD	700C/29 in 622 mm BSD
Tire Width	45mm	45mm	45mm	45mm	45mm	45mm
Tire Width Max	52mm	52mm	52mm	52mm	52mm	52mm
Tire Outer Diameter	712mm	712mm	712mm	712mm	712mm	712mm
Bike Length with Tires	1722mm	1736mm	1739mm	1744mm	1757mm	1770mm
Crank Length	165mm	165mm	170mm	170mm	172.5mm	172.5mm
Stem Length	80mm	90mm	90mm	100mm	100mm	110mm

Very Upright

Somewhat Upright

Average

Somewhat Aggressive

Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Category Trend

Source:https://us.bmc-switzerland.com/collections/kaius-01-gravel-bikes/products/kaius-01-three-bikes-bmc-27a-000074#custom_specs_CKanhk

2026 BMC Switzerland Kaius 01 Three

Geometry