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Engineered & Designed by Rocker Parts
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Engineered & Designed by Rocker Parts
An Ahead stem clamps the protruding fork steerer tube. from the outside. Requirement: no external thread on the fork steerer tube.
Our stems fit 1⅛" (28.6 mm) fork steerer tubes. Handlebar clamps: 31.8 mm or 35 mm. Please check both diameters.
Not compatible: fully integrated cable routing by extension/Fork stem – please be sure to check our ICR cable routing.
Yes, for Pedelecs up to 25 km/h in the intended area of operation. Not released for S-Pedelecs (45 km/h).
FlatFit™ holds the handlebars in place during sideways swiveling. flat. This means the bike fits better in the rear garage of a motorhome, for example. without tools.
Because of the angled fork, the handlebars rise when swiveling. Our geometry This automatically compensates for 10° – depending on the handlebar width, this reduces the altitude gain by up to approximately 7 cm - that will be with the patent application FlatFit™ technology reached.
Refers to simple and quick assembly without special tools.
The stem is installed like a classic stem – without any modifications to the fork steerer or frame.
The actual assembly effort may vary depending on the type of bicycle and its features.
To ensure your stem is securely in place, the clamping lever must be adjusted with the correct preload.
We recommend the following Two-finger ruleThe lever should move with two fingers Just barely able to open.
With just one finger If it is not possible → then the preload is too weak.
With more force than two fingers → The preload is set too high.
This ensures that your stem clamps reliably, but can still be operated comfortably and without tools.
LiftFix secures the height Simple and tool-free. The locking mechanism prevents unintentional adjustment the height adjustment.
All the extensions are prepared to Accessory mounts Easy to retrofit (adapters required).
Some manufacturers call it "rotatable", we call it swiveling – technically it's the same principle: the handlebars are moved sideways to save space.
Under unfavorable conditions, noise can occur at the joints. In this case, a light spray of chain lube (bicycle/motorcycle) into the pivot joint will help to make the movements quiet and smooth again. Please use sparingly and avoid contact with braking surfaces.
The stem locks automatically in the 90° position.
The integrated AutoLock-This function ensures a defined, stable handlebar position – no wobbling and no independent twisting.
6061: proven, robust lightweight metal. 7075: high-strength Aerospace-grade material for maximum stiffness at low weight. We use the material depending on the component requirements.
Our assembly paste ensures more Slip resistance between the stem and steerer tube, and between the stem and handlebars. This ensures everything sits securely and stably, preventing unwanted twisting. At the same time, the paste protects the surfaces and facilitates later disassembly.
We manufacture on modern 5-axis CNC machines for precise fits.
Edgeless means: no sharp edges not at the handlebar clamp, but chamfers/radii – reduces notch effect, protects the handlebar.
Ja. Der RocStem AiO wurde mechanisch nach DIN EN ISO 4210-5:2023 (Mountainbike) geprüft. Dabei wurden die für Vorbauten relevanten statischen und dynamischen Belastungsprüfungen erfolgreich bestanden. Die mechanische Prüfung nach DIN EN ISO 4210-5:2023 wurde am technisch anspruchsvollsten Modell der RocStem-Baureihe durchgeführt. Alle RocStem-Varianten basieren auf derselben konstruktiven Plattform.
Our extensions are after four Requirement classes categorized. These help to assess for which driving style and load a product is intended.
Grade 1 – Everyday Life
For roads, cycle paths and daily use with city, urban and trekking bikes.
Klasse 2 – Tour
For longer tours on asphalt, gravel, forest and woodland roads with trekking, touring and e-bikes.
Klasse 3 – Aktiv
For active riders, sporty tours, and more demanding routes with trekking, gravel, cross, and e-bikes. Occasional jumps or drops up to 30 cm high are permitted. RocStem stems are classified as suitable for this performance category.
Klasse 4 – Sport
For enduro, downhill, bike parks, big jumps and similar extreme loads.
Important: RocStem stems are not approved for use in performance class 4. This includes, in particular, downhill, freeride, dirt jump, bike park use, competition use, and jumps over 30 cm in height.
We advise against mounting our stems on carbon steerer tubes because carbon is more sensitive to concentrated clamping loads. Our stems could potentially generate higher or more localized stresses that could damage the carbon steerer tube (e.g., due to height adjustment or extension length). For safety reasons, we therefore recommend using only aluminum steerer tubes.
SLS describes a Safety latch in the tension lever, this against the direction of travel It must be tensioned before the tensioning lever can be opened. prevents unintentional opening and increases operational reliability.
Account holder's name in lowercase followed by one word, e.g., maxmustermann.
We check and clearly mark reviews (e.g., order reference/verification). Details in our review information.
We reduce plastic as far as possible; if necessary, we use recycled materials.
An Ahead stem grips and clamps the protruding steerer tube from the outside. The steerer tube must not have external threads.
A proven, high-strength aluminum that is primarily used in vehicle construction.
A very high-strength aluminum alloy used particularly in vehicle manufacturing and aerospace. It is ideally suited for highly stressed components.
The Rocker Parts system, used to classify bicycle components according to riding style, intended use, and load, is a key component classification system. Classes 1 through 4 are based on the application categories of the ASTM standard and help to quickly identify the intended use of a product.
Distance from the center of the fork steerer tube to the center of the head tube.
Automatic locking of the stem in the 90° position for a stable handlebar position without twisting.
The angle of the handlebar grips relative to the handlebar's center axis. This influences handling, for example, by allowing for a relaxed position of the elbows and hands. An angle of 5° to 8° is optimal.
Information on the authenticity and verification of our customer reviews.
CNC (Computerized Numerical Control) machines manufacture components with the highest precision. Our components are produced on modern 5-axis machines.
An e-bike is powered exclusively by an electric motor (without pedal assistance). Helmets and insurance are mandatory.
Universal accessory interface for all RocStem stems, compatible with lights, speedometers, navigation systems, and action cameras. Retrofittable on all models.
„"Edgeless" means that the handlebar clamps have no sharp edges, but rather rounded transitions. This reduces stress concentrations and protects the handlebars.
Our patent-pending FlatFit™ technology ensures the handlebars stay flat when swiveling. This allows the bike to fit better in low spaces – without modifications or tools.
The height adjustment describes the one-time, tool-related adjustment of the handlebar height during assembly.
It is not a quick-adjustment feature for everyday use – only the swivel function of the handlebars can be adjusted without tools.
In this design, brake and shift cables run directly through the headset into the frame. This creates a clean look, but can restrict the handlebar's range of motion with swivel stems.
The Cable routing ICR Rocker Parts guides the cables past the pivot area without kinks, so that the handlebars remain freely movable.
We avoid using plastic in packaging wherever possible. Where necessary, we use recycled materials.
Common handlebar diameters at the stem clamp are 25.4 mm (1"), 31.8 mm (1⅛"), and increasingly 35 mm. The grip area is usually 22.2 mm.
The steering angle of a bicycle causes the handlebars to rise when turning. Our special geometry (FlatFit™ technology) compensates for this by 10° – reducing the rise by up to 7 cm, depending on the handlebar width.
The LiftFix system prevents unintentional adjustment of the height setting.
For the SEPA direct debit scheme: enter the account holder's name in lowercase as one word (e.g. maxmustermann).
Label for our stems with the patent-pending FlatFit™ technology.
Special grease with microparticles, used on stems and handlebars. It increases slip resistance, protects surfaces, and facilitates disassembly.
An electric bicycle with pedal assist. It is powered by a combination of muscle power and a motor. Maximum speed with assistance: 25 km/h.
„"Plug & Ride" stands for simple and quick installation. The RocStem is mounted like a classic stem – without drilling, sawing, or permanent modifications to the bicycle. The stem is usually ready to use in just a few minutes.
Depending on the bicycle model and components, the assembly effort may vary slightly. We are happy to assist you if you have any questions.
Der RocStem AiO wurde mechanisch nach DIN EN ISO 4210-5:2023 (Mountainbike) am technisch anspruchsvollsten Modell der RocStem-Baureihe geprüft. Alle RocStem-Varianten basieren auf derselben konstruktiven Plattform.
Rise refers to the height difference of the handlebars. This allows you to adjust the cockpit position. A higher cockpit promotes a more relaxed riding posture.
A stem is inserted into the steerer tube and clamped from the inside. The minimum insertion length must be observed.
Safety mechanism of our swiveling stems. An additional latch prevents unintentional opening, and the double stem clamp increases stability.
A pedelec with motor assistance up to 45 km/h. A Class AM driver's license is required, as well as insurance and helmet.
The angle of the handlebar grips should be upwards. An angle of 3° to 8° is optimal to promote an ergonomic wrist position.
…we at Rocker Parts speak to you directly – clearly, simply, and without any frills. We're not about twisting words or sugarcoating things, but about talking to each other honestly.
One thing is paramount for us: respect. Everyone is welcome – regardless of whether you are a woman or a man, young or old, regardless of origin, religion or sexual orientation. We believe in genuine togetherness, not in pigeonholing.
And because we prefer to invest our energy in good products rather than language debates, we consciously avoid complicated gender-inclusive language. Because in the end, it's not the perfect wording that counts, but what we do: delivering quality, being open, and remaining fair.
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