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Smart.Shift

G1 GPI

from

9.499,00 €

incl. 19% VAT , plus (Komplettbike)

Available immediately

Frame size
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Easy assembly 5 year warranty Testride Technical Data Custom Gallery

G1 GPI

All Gravity - Low Maintenance

The G1 GPI joins the lineup of models that stay true to their rugged, configurable and performance driven roots - a sibling that shares the same DNA as the G1 but places a strong emphasis on durability, long-term reliability, and minimal maintenance. At the heart of the frame is a Pinion C1.12i 12-speed gearbox, electronically operated and paired with a Gates Carbon Drive belt, ensuring smooth and efficient power transmission to the rear wheel. The 2025 G1 introduced an update to the size-dependent geometry, driven by the Geometron team, focussing on each frame size growing proportionally to ensure an optimum balance between the rider contact points, the front center and rear center, and thus a consistent load distribution on the front and rear wheels, vital for achieving a consistent ride feel. The G1 GPI is best described as a Superenduro - an adaptive gravity platform designed for a wide range of riding styles and conditions, built for hard and fast action. Whether on the enduro race track, downhill course, bike park jumplines, or long alpine adventures, the G1 GPI thrives.

Geolution 2.0

The geometry of the G1 GPI is based on NICOLAI's specific Geolution concept, which has already seen us taking on a pioneering role in establishing modern, progressive frame designs in the past. In simple terms, Geolution means that a slacker head angle, longer reach and the associated longer wheelbase make a mountain bike faster, smoother and safer. The steep seat angle in combination with a longer wheelbase ensures a central and comfortable riding position on the bike. This geometry design ensures optimum load distribution between the front and rear wheels. This increases the rider's degree of control in dynamic riding situations and improves the overall handling of the bike. Climbing characteristics are improved as the steep seat angle and long front end position the rider in such a way that the front wheel is prevented from rising on steep climbs.

True Size-Proportional Geometry

S - XXL

From frame size small to XXL, the G1 GPI has been meticulously designed to ensure consistent weight distribution, handling, and responsiveness across all frame sizes. Unlike designs that simply increase top tube and chainstay length, the G1 GPI features true proportional geometry, refining multiple key dimensions for optimized balance and control. One of the standout aspects of this approach is that head tube and seat tube angles are selected based on the frame size. This ensures an optimal balance between front center and rear center, maintaining stability and precision across the size range. Additionally, a consistent ratio of reach to stack plays a crucial role in evenly distributing rider weight between the front and rear wheels. Proper load distribution is essential—only a correctly weighted tire can generate the necessary traction on varied terrain, while an imbalanced wheel load can result in understeer or oversteer. At first glance, the geometry figures across the different frame sizes may seem unconventional, but they are the result of extensive calculations, real-world testing and customer feedback. The outcome is exceptional bike handling, delivering maximum performance, control, and confidence—whether you're a rookie or a seasoned pro, regardless of body size or frame choice.

Mutators - adaptation and customization

Center of gravity, handling, manoeuvrability and smooth running

The seatstay and chainstay length of the G1 GPI can be adjusted using interchangeable adapters of different sizes, known as Mutators. This system allows the bike to be configured as a 29er, 27.5er, or mixed-wheel setup, offering riders the flexibility to fine-tune their setup based on personal preference and terrain. Beyond wheel size adjustments, Mutators also enable customization of riding characteristics, influencing center of gravity, handling, maneuverability, and overall ride feel. Each swingarm Mutator consists of two half-shells, which are securely mounted and connected to the strut via a tapered, rectangular positive-fit interface—ensuring a precise, play-free, and torsion-resistant connection. Additionally, the integrated bearing seal and axle minimize the number of components in the linkage, reducing wear and maintenance. The Mutators installed at the factory correspond to the standard bike setup, as outlined in the NICOLAI geometry chart. A separate chart provides a detailed overview of how different Mutator configurations impact geometry, allowing riders to make informed adjustments for their ideal ride experience

Pinion C1.12i Smart.Shift

Gear changes within a fraction of a second, even under load

Shifting on the G1 GPI is managed by the electronically controlled Pinion C1.12i gearbox, which offers 12 evenly spaced gears and a total gear ratio of 600%. The Pinion technology utilizes a spur gear system with two sequentially shifted sub-gears, ensuring that power is always transmitted through two pairs of gears in every selected gear. This results in exceptionally high efficiency, minimal noise, and a direct riding experience. All gears can be shifted individually in sequence or in any number of increments, whether you're stationary or riding. Beyond its impressive functionality and smooth operation, the Pinion gearbox stands out for its resistance to dirt and damage, durability, and minimal service requirements. The addition of the Gates Carbon Drive further reduces maintenance and care needs.

Gates Carbon Drive

CARBON FIBER REINFORCED MAINTENANCE FREE DRIVE BELT

For all NICOLAI models with gearboxes or hub gears we use the GATES Carbon Drive. This carbon fiber reinforced drive belt transmits power efficiently, quietly and chainslap-free to the rear wheel, without stretching. The CentreTrack guides the belt along the sprockets keeping everything in line and never jumps off. Unlike traditional chains, the Gates Carbon Drive requires no lubrication or special care. Dirt and mud can simply be washed off with water, though most of this is removed by the cleverly designed teeth profiles that expel dirt as you pedal. The service life of a Carbon Drive can exceed that of a conventional chain many times over.

Horst Link, anti-squat und anti-rise

The rear triangle of the G1 is designed around the Horst-Link concept, offering constant progression throughout the entire travel. This design provides a sensitive response to small bumps, ensuring maximum grip and traction, while also offering ample usable travel with ideal support in the mid-stroke and a solid reserve for hard hits and landings. Unlike derailleur systems, where the anti-squat value fluctuates depending on the selected gear, the G1 GPI maintains a constant anti-squat value of 115% with 30% sag. Anti-squat refers to the force generated by the drive belt during pedaling. This causes the rear end to either squat or lift, depending on the suspension layout. A well-engineered linkage design can leverage this behavior to counteract chassis movement caused by pedaling forces, improving efficiency and control. This feature enables the G1 to climb efficiently and accelerate without losing momentum, even as a long-travel bike.

The anti-rise value, which counteracts the geometry change caused by rear-end rebound when the rear brake is applied, is 70% at 30% sag. This ensures that the suspension remains active under braking, providing better traction and stability when descending or during hard braking.

G1 GPI frame standards und interfaces

Gear changes within a fraction of a second, even under load

The G1 GPI features a ZS56 head tube, which provides a broad range of compatible headsets and offers additional adjustment options. With the appropriate headset shells, riders can fine-tune reach, front center, and steering angle to further customize the bike's geometry. At the rear, the 148 x 12 mm thru-axle ensures added stiffness and allows for easy rear wheel removal. The cables are routed externally as standard, providing quick service access, and are securely held in place by bolted brackets. For those who prefer internal routing, internal brake line routing is available upon request, while the dropper post cable is always routed internally. The frame mount for the gearbox follows the Pinion C-Line standard, meaning it is compatible only with gearboxes from the C-Line series. It is not compatible with Pinion P-Line gearboxes like the P1.18. Additionally, the G1 GPI can be configured with the analog C1.12 and the classic rotary shifter instead of the electronically controlled Pinion C1.12i gearbox upon request.

Series specs and customizing

Tuning-Options

The G1 GPI is available as a complete bike in the high-quality 8.0 configuration, but it can also be purchased as a frame kit that includes the Pinion gearbox and Gates drive train components. You can then complete the build either using the NICOLAI configurator on our website or by assembling your bespoke custom bike on your own. The base configuration is designed for electronic shifting with the Pinion Smart.Shift system, but, as a custom brand, we aim to accommodate individual preferences wherever technically feasible. As such, the G1 GPI can also be supplied with the classic analog Pinion rotary shifter paired with the mechanically operated C1.12 gearbox.

8.0 spec - performance first

performance first

The 8.0 version of the G1 GPI is all about high-quality, high-performance components, perfectly tuned for every kind of gravity riding. Up front, the Fox 38 Factory suspension fork with its Grip X2 damper lets you dial in a pro-level custom setup in no time. With 170 mm of travel, it plows through any terrain while maintaining sharp steering precision, thanks to its stiff chassis and burly 38 mm stanchions. In the rear, a Fox DHX2 Factory 2POS coil shock (230 × 65 mm) delivers either 162 mm or 175 mm of rear wheel travel, offering an ultra-sensitive response for maximum traction. The 2-position adjustment lever lets you switch to a firmer setting with a single click—perfect for climbing or cruising on flatter terrain.

Topology optimization

Computer-aided design to optimize durability, function and weight

In the design of turned and milled parts, we use FEM software (Finite Element Method) to simulate the loads that will occur in later use in order to determine the optimum shape (topology) of these components. Critical areas of the design become visible in this way and can be strengthened by adding material, while material can be saved at less stressed points. In this way, highly complex parts and assemblies can be manufactured that combine maximum durability with minimum weight.

HMT

Hollow Milled Technology, load and weight optimized hollow milled volume components

Hollow milled technology is a design and production process for manufacturing hollow milled volumetric components in high-load areas of the frame - such as the front triangle cross bracing or the seat dome on the G1. During the design process, computer modelling is used to determine the stress zones in the material. Highly stressed areas can thus be reinforced, while material can be saved in areas subject to low loads. This method is called topology optimization. The use of state-of-the-art 5-axis milling machines allows us to manufacture complex, hollow milled frame components from a single piece of aluminium and to transfer the optimized design with the highest level of detail.

Insert Bearings

four-fold sealed full-ball groove and angular contact ball bearings

The rear end of a full-suspension bike is subjected to high dynamic loads during riding. The focus here is on the bearing points where the forces are transmitted between the components. The full-ball, double-sealed bearings installed on our frames are made by the ENDURO brand. They not only have top marks for power transmission, but also a particularly low breakaway torque, which ensures sensitive, smooth suspension response. At the same time, they offer the best possible sealing against dirt and moisture for a long service life and long maintenance intervals.

7020 Aluminum

Sustainable and enduring

All our frames are manufactured from 7020-T6 aircraft grade aluminum, because we are convinced that this alloy is the superior material in the construction of mountain bikes. Compared to the 6061-T6 (AlMg1SiCu) alloy commonly used in bicycle construction, 7020-T6 (AlZn4.5Mg1) has about 30% higher tensile strength and about 20% higher elastic limit. The widespread use of 6061-T6 aluminum in frame construction is due in part to the fact that it can be processed at lower tooling costs and frames can be straightened after welding with less technical effort. Our frames are engineered and designed so that when overloaded, deformation occurs in a defined area of the frame rather than breakage, significantly reducing the risk of serious accidents and injuries. A NICOLAI aluminum frame is designed to withstand many years even under tough competition conditions.

NICOLAI Welding Technology

Craftsmanship and engineering in perfection

We weld our frames by hand using the TIG process. Our welders are specially trained for this and have many years of experience. For each model and frame size, a precise welding fixture is built, called a frame jig. In it, the CNC-cut tube sets are precisely assembled and fixated with all turned and milled parts of a frame that are to be welded. The frame components are first tacked with single spot welds at precisely specified points in a defined sequence and then, to minimize distortion and stresses, welded in several passes.

Extra Love

powder coating and anodizing colors, decals, customizing, individualization

Thanks to a wide range of colors, every NICOLAI frame can be customized as desired. In our factory's powder coating facility, we process more than 50 colors, each of which can be applied in a high-gloss or satin finish. A separate color is possible for each welded frame component. Frames and frame components can also be anodized as an option, with a choice of black, bronze or titanium. An extended range of anodized colors is available for turned or milled applications such as bell cranks, bearing caps or cable clips, allowing color matching with common components, for example. We also offers an uncoated aluminum finish as "factory raw". If you then add the range of decals colors, the number of design options is almost limitless and a unique, personalized custom bike is guaranteed.

COLOR SAMPLES

CUSTOM BIKE GALLERY

Warranty and spare parts supply

NICOLAI grants a 5-year warranty on all frame models against breakage and material failure, even in racing use or when jumping. The premise is that the respective models are used within the scope of their designated purpose and are equipped only with the components for which there is an approval. In addition, the manufacturer guarantees a spare parts supply for all models for a period of at least 10 years. Since NICOLAI manufactures all components of its frames itself and on its own machines, in individual cases a subsequent production of spare parts is even possible beyond the period of 10 years.

BIKEBOX

We have developed an elaborate reusable bike box for our mail-order shipping. In it, the new NICOLAI bike arrives protected in a wooden frame and guaranteed safe at the customer and is ready for use after a few simple steps. The same box is reused when the bike is returned to us for repair or service. All shipping protections of the bike box such as pads, lashing straps, brackets and screw connections are also reusable.

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G1 GPI

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TECH SHEET

G1 GPI

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G1 GPI

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