Bmc Kaius 01 THREE

A race-ready gravel bike from 2026, made in 6 sizes from 47 to 61. Fits tyres up to 52 mm.

Size

Stack 561 mmReach 396 mm

Geometry

Bmc Kaius 01 THREE geometry by frame size
Size
Fit
Stack (mm)How high the front sits	521	541	561	581	606	631
Reach (mm)How far forward the bars start	385	392	396	400	405	409
Stack ÷ reach Higher = more upright	1.35	1.38	1.42	1.45	1.50	1.54
Top tube (effective) (mm)Horizontal top-tube length	531	544	559	569	587	598
Seat tube angle Saddle position over the pedals	74.3°	74.3°	73.8°	73.8°	73.8°	73.8°
Seat tube length (mm)Frame size reference	429	449	471	485	509	533
Standover (mm)Clearance when you stop	739	758	779	795	815	838
Handling
Head tube angle Steeper = quicker steering	70.8°	70.8°	70.8°	71.6°	71.6°	71.6°
Fork offset (mm)Fork rake	50	50	50	45	45	45
Trail (mm)More = steadier steering	72	72	72	72	72	72
Wheelbase (mm)Longer = more stable	1010	1024	1027	1032	1045	1058
Chainstay (mm)Shorter = snappier	425	425	425	425	425	425
BB drop (mm)More = lower centre of gravity	79	79	79	79	79	79
BB height (mm)Pedal clearance in corners	257	257	257	257	257	257
Front centre (mm)Room for your toes	597	611	614	619	633	645
Other
Weight (kg)Complete bike, as published	8.3	–	–	–	–	–

Underlined values are calculated by BikeLens. A dash means the brand doesn't publish it.

A racy stance with road-bike efficiency on fast, mixed surfaces.

Size 54 is lower and longer than 90% of the 106 gravel frames we track.

The closest gravel frames from other ranges, against size 54 here.

Bikes with a similar fit, compared with size 54 of this bike
Bike	Size	Stack	Reach
Megamo SILK 01 SLR2026Stack −4 mm, reach −1 mm	M	−4 mm	−1 mm
Specialized Crux 5 Comp - SRAM Rival XPLR2027Stack −1 mm, reach −8 mm	54	−1 mm	−8 mm
Grind TRACE2026Stack +1 mm, reach +4 mm	M	+1 mm	+4 mm
Canyon Grizl 52025Stack −5 mm, reach +1 mm	S	−5 mm	+1 mm
Cervelo R5-CX2026Stack −1 mm, reach −7 mm	56	−1 mm	−7 mm
Romet Aspre 1.02026Stack same, reach +8 mm	M	same	+8 mm

These builds share this exact geometry, so they fit the same.