KB4RC

Racing Freedom

The KB4RC embodies racing freedom with its compact, super short-wheelbase frame and a 142 PS engine that delivers exhilarating power and laser-sharp handling. Carrying the spirit of a café racer, bimota’s unmatched craftsmanship meets cutting-edge performance, offering unrivaled agility and grin-inducing torque. Every metal part is meticulously machined from billet to ensure precision and quality. The KB4RC allows you to experience the pure, unrestrained spirit of racing. Feel the thrill of control, where innovation and power converge—this is freedom, unleashed.

Rideable Art

Down to the smallest detail, the KB4RC exudes high quality—from the carbon-crafted paintwork and machined alloy parts to OZ Racing forged wheels and a real leather seat. Its torqueful engine and advanced electronics further reflect the same standard. It is no exaggeration to call the KB4RC rideable art.

Innovative Design

The KB4RC bimota is unique, with an innovative aesthetic never seen before.
The design is instantly recognizable as bimota and "KB4RC".

Maximum lightness and extraordinary agility

One example of function pursued to its extreme is the KB4RC’s light weight. To achieve this, both weight reduction and a chassis design that does not let the rider feel its weight were pursued. The result is light, nimble handling in a compact package.

Technical Information

Max. Power

104,5 Kw / 142 PS
@ 10,000 rpm

Max. Torque

111 N･m / 11.3 kgf･m
@ 8,000 rpm

Curb Mass

190 kg (with all the liquids except fuel)

Show All Specifications

KB4RC

Technical Information

Frame type

High-resistance steel trellis, with Aluminium alloy plates (machined from billet)

Engine type / Valve system

Liquid-cooled, 4-stroke, inline 4-cylinder; DOHC, 16 valves; Euro 5 compliant

Displacement

1,043 cm³

Bore x Stroke

77.0 mm × 56.0 mm

Compression ratio

11.8:1

Max. power

104,5 kW (142 PS) / 10,000 rpm

Max. torque

111 N･m (11.3 kgf･m) / 8,000 rpm

Fuel system

Fuel injection (ø38mm x 4)

Fuel tank capacity

19.5 lt.

Lubrication system

Forced Lubrication (wet sump)

Engine oil capacity

4.0 lt.

Transmission

6-speed, return

Gear ratios

1st 2.600 (39/15)
2nd 1.950 (39/20)
3rd 1.600 (24/15)
4th 1.389 (25/18)
5th 1.238 (26/21)
6th 1.107 (31/28)

Primary reduction ratio

1.627 (83/51)

Final reduction ratio

2.733 (41/15）

Clutch type

Wet multi-disc, manual

Final drive

Chain

Overall length

2.040 mm

Overall width

773 mm

Overall height

1,060 mm

Wheelbase

1,390 mm

Ground clearance

140 mm

Seat height

810 mm (+/- 8 mm)

Rake / Trail

24° / 100.8 mm

Front suspension

Öhlins front fork FG R&T 43 NIX30

Rear suspension

Machined aluminium swingarm, Öhlins TTX 36

Front wheel travel

130 mm

Rear wheel travel

122 mm

Front tire

120/70ZR17 (58W)
Pirelli DIABLO™ Supercorsa V3 SP

Rear tire

190/50ZR17 (73W)
Pirelli DIABLO™ Supercorsa V3 SP

Front wheel

Forged, J17M/C × MT3.50

Rear wheel

Forged, J17M/C × MT6.00

Front brake

Dual ø320 mm discs

Rear brake

Single ø220 mm disc

Curb mass

190 kg

Start of sales

2022

Engineering Excellence Meets Striking Design

Easy to Ride

With the KB4RC, we were inspired by the idea of a bike that was easy to ride, with good torque, and light weight inherited from the KB4. The target to achieve this was “Freedom.”
By making the perfect match between the rider and their riding style, and enabling the rider to freely adjust the riding position to suit their size and preference, we were able to realise a superb handling bike with a strong character.

Neo-Retro Naked Meets Modern Performance

The KB4RC combines authentic round headlights and naked bike aesthetics with the performance of a modern sportbike. Lightweight carbon-fibre bodywork, slim tail cowl, and red trellis frame visible between body panels highlight this bike’s unique blend of performance and design. The single-piece seat offers sporty ergonomics, while the OZ Racing forged aluminium alloy wheels contribute to nimble handling.

Under-Seat Radiator System: The Key to Ideal Weight Distribution

In order to achieve bimota's ideal front-rear weight distribution (54/46), the radiator is located under the seat allowing the engine to be positioned farther forward. Also, the KB4RC combines a short wheelbase (equivalent to that of a 250cc class bike) with a long swingarm, achieving both agile handling and outstanding traction.
More agile, more flexible. The KB4RC delivers a riding experience perfectly in tune with the rider's intentions.

Nimble Handling

The KB4RC’s frame is a composite structure typical of bimota. At the front, a trellis frame connects the engine with the steering head, while a plate machined from a single block of aluminium alloy connects the engine to the swingarm at the rear. This unique, highly advanced structure achieves both high rigidity and a compact shape.
The combination of this frame structure with Öhlins suspension and Brembo brakes is the key to nimble handling, allowing the KB4RC to respond exactly as the rider wishes as they trace their intended line through the corner.

Engine Incorporating Advanced Electronics

The KB4RC features Kawasaki's 1,043 cm³ liquid-cooled 4-stroke In-Line Four engine delivering 142 PS and excellent response in the low-rpm range. In addition, KB4RC riders are supported by a suite of the latest electronics.

High-Tech Cockpit and Ergonomics

At the centre of the cockpit is TFT colour instrumentation displaying detailed riding information. The riding position can be fine-tuned thanks to an adjustable ride height and adjustable footrests, while a stress-reducing quick shifter allows riders to get the most from their KB4RC.