BMC Kaius 01 Four Bike

$5,199⁰⁰ $6,499⁰⁰

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BMC | SKU: 30007067 | Option: Black / Neon Red, 61cm

This product is HSA / FSA eligible

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BMC Kaius 01 Four Bike Info

BMC has been building bikes in Grenchen, Switzerland since 1986, and the BMC Kaius 01 Four Bike is where that engineering tradition meets the demands of modern gravel racing. The Kaius 01 is BMC's performance gravel platform — built for riders who race gravel, not just ride it — and the Four is the entry point into that platform, pairing the Kaius 01 carbon frame and fork with a full SRAM Rival XPLR AXS build at $5,199.

The frame and fork are built from Kaius 01 Premium Carbon shaped around three integrated technologies. Aerocore is BMC's aero carbon design, derived from the Teammachine R 01 road race bike — tube profiles and transitions engineered to reduce drag at the speeds modern gravel racing produces, where average speeds at major events often push toward 35 kph. ICS (Integrated Cockpit System) routes cables and hydraulic hoses internally through the stem and headtube, eliminating external housing and reinforcing the frame's aerodynamic intent. The third element is TCC Race compliance — specific zones of the frame are tuned to flex vertically while maintaining lateral stiffness, absorbing trail chatter before it reaches the rider and keeping tires planted through rough sections. BMC's logic is direct: planted tires maintain traction, and traction is speed. The D-shaped carbon seatpost adds compliance from the saddle down and is compatible with BMC's D-Fender for year-round use. The frame runs 12mm thru-axles front and rear and uses a UDH (Universal Derailleur Hanger) for broad service compatibility.

The drivetrain is SRAM Rival XPLR AXS, a groupset built specifically for gravel riding. The XPLR designation reflects its gravel-first design: 1x13 with a 42t chainring and a 10–46 cassette that covers steep climbs and flat-road pacing without requiring a front derailleur. Wireless operation eliminates cables from the shift path entirely, keeping maintenance low and the cockpit in line with the Kaius 01's integration intent. Braking comes from SRAM Rival AXS hydraulic disc calipers on SRAM Paceline Centerlock 160mm rotors front and rear. The BMC RSM 01 integrated stem pairs with a BMC HB D4 03 alloy handlebar — 125mm drop, 70mm reach, and 12 degrees of flare. That flare angle widens the hand position in the drops, improving stability and control on unpredictable surfaces where narrow drops become hard to hold.

BMC equips the Kaius 01 Four with its own CG 40 carbon wheels — 40mm wide, tubeless-ready rims designed around the gravel platform. The width provides a stable foundation for gravel-specific tire volumes without excess weight, and the tubeless-ready bed works directly with the included Pirelli Cinturato Gravel H tires in 700x40. The Cinturato Gravel H is Pirelli's fast-rolling hardpack tubeless option: a file-tread center for low rolling resistance on packed surfaces, side knobs for cornering on loose terrain. At 40mm, the setup sits at an efficient balance point for mixed conditions, and tire clearance extends to approximately 44mm for riders who want more volume in wet or technical riding. The saddle is a Fizik Vento Argo X5 in 140mm — a short-nosed design intended to allow more hip movement in the forward position gravel racing demands. Carbon bottle cages from BMC's Aerocore line complete the build, keeping the frame's visual language consistent.

The Kaius 01 Four is built for gravel racing, and the spec reflects that at every touchpoint: the aero-tuned carbon frame, wireless wide-range drivetrain, integrated cockpit, and carbon wheels. The Four build puts you on the full Kaius 01 platform — the same frame and fork used across the entire 01 lineup — with SRAM Rival XPLR AXS rather than the higher-tier Red or Force builds above it. The frame is where the meaningful investment is, and it doesn't change. Available in Black/Neon Red across six sizes from 47cm to 61cm. Pedals are not included.

BMC Kaius 01 Four Bike - Specifications

Frame Material:

Fork:

Headset:

Integrated

Seatpost:

Kaius 01 Premium Carbon D-Shaped Seatpost | 15mm Offset | D-Fender Compatible

Rear Derailleur:

SRAM Rival XPLR AXS E1

Crankset:

SRAM Rival AXS E1 WIDE

Chainrings:

42t

Bottom Bracket:

SRAM Press Fit DUB

Brake Calipers:

SRAM Rival AXS E1 Hydraulic Disc

Rotors:

SRAM Paceline Centerlock 160mm

Shifters / Levers:

SRAm Rival AXS E1

Cassette:

SRAM XG-1351 E1 13-speed 10-46

Chain:

SRAM Rival E1 13-speed

Wheel - Front:

CG 40 Carbon | Tubeless Ready | 40mm

Wheel - Rear:

CG 40 Carbon | Tubeless Ready | 40mm

Stem:

BMC RSM 01 | Integrated Cockpit System Technology

Handlebar:

BMC HB D4 03, 0, 12 | Alloy 6061 | 125mm drop, 70mm reach, 12-degree flare

Saddle:

Fizik Vento Argo X5 | 140mm

Tires:

Pirelli Cinturato Gravel H | Tubeless | 700x40

Pedals:

Not Included

Bottle Cages:

Aerocore Design Carbon Bottle Cages

*Specifications are subject to change.

BMC Kaius 01 Four Bike Geometry

Size:

B. Seat Tube (c-t)

428

452

468

493

513

533

C. Top Tube Length

546

559

569

579

592

604

D. Head Tube Length

106

123

144

170

196

E. Chain Stay Length

420

F. BB Drop

135

G. Seat Tube Angle

H. Head Tube Angle

I. Stand Over Height

684

722

756

780

798

818

J. Wheel Size

700c

K. Stack

510

530

550

570

595

620

L. Reach

390

397

401

405

410

414

Stem Length

80mm

90mm

100mm

110mm

Bar Width

39cm/44.8cm

41cm/46.8cm

43cm/48.8cm

M. Crank Length

170mm

172.5mm

175mm

The RA Perspective

The Kaius 01 Four is for riders who take gravel racing seriously. BMC built the whole Kaius 01 platform around the reality that gravel races have gotten fast — and the bike needs to reflect that. The Aerocore frame is shaped like a road race bike in a lot of ways; you can see it in the tube profiles and the way the cockpit integrates. That's not aesthetic, it's functional.

The TCC Race compliance is one of those features that sounds like marketing until you feel it on a rough course. BMC tunes specific sections of the frame to flex on the vertical axis without losing lateral stiffness. On loose gravel or chunky terrain, the difference is noticeable — the bike stays planted through corners rather than bouncing off line. More traction is more speed, especially late in a long race when fatigue amplifies every input error.

The SRAM Rival XPLR AXS is well-matched to this frame. It's not a budget spec holding back a premium platform — XPLR was designed for gravel specifically, the wireless reliability is consistent, and the 10-46 cassette covers just about any terrain the Kaius will encounter. The CG 40 carbon wheels are a good complement: stiff enough for the frame's racing intent, and tubeless-ready straight out of the box.

The one thing worth conveying to customers: the Kaius 01 platform rewards riders who are pushing hard on technical terrain. The TCC Race compliance pays dividends on rougher courses and longer efforts. For riders primarily doing smooth hardpack crits or road rides, the compliance might feel like softness rather than a feature. For proper gravel racing — or anything approaching it — this bike is well-considered from the ground up.

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