JetBlack Victory Compatible ROCKERON Classic – Tunable Rocker Feet with Front Riser

Important – Size selection

We offer two versions: 49 mm and 52 mm.
This refers to the outer diameter of the rubber caps on the steel tubes, measured in millimeters.

Please measure this first and then select 49 or 52.

The standard size should be 49 mm, but some models are delivered with 52 mm

- 49 mm corresponds to 1.93 inches

- 52 mm corresponds to 2.05 inches

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ROCKERON Classic

Tunable side-to-side movement for JetBlack Victory & Front Riser

ROCKERON Classic transforms your indoor trainer into a more natural and comfortable riding experience – without bulky rocker plates or complex setups.

Designed specifically for the JetBlack Victory, ROCKERON introduces controlled side-to-side movement that reduces stiffness, increases comfort on long rides, and lets you fine-tune your ride feel using different ball stiffness levels.

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Tunable ride feel – choose your setup

Select your preferred configuration during checkout:

Essential (Hard – yellow balls)
Balanced and stable ride feel.
Recommended for most riders.

Performance (Hard + Medium + Soft)
Includes yellow, green and orange balls.
Allows precise tuning depending on rider weight, riding style and comfort preference.

No balls (use your own)
Recommended if you already own suitable balls.

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Why ROCKERON?

Adjustable by design

ROCKERON uses a protected internal retention geometry that securely holds the balls under load.
This design is the core of ROCKERON and enables safe swapping between different ball stiffness levels without slippage or instability.

Ball stiffness options:

Yellow – Hard: Stable, efficient, race-like feel

Green – Medium: Balanced movement for everyday riding

Orange – Soft: Maximum comfort and freedom on long sessions

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Natural movement, real comfort

The controlled side-to-side motion reduces saddle pressure, relieves stress on hips and lower back, and delivers a more road-like riding experience indoors.

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Minimalist alternative to rocker plates

- No large platforms

- No heavy frames

- Just a compact, clean solution focused on function

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Compatibility

✔ JetBlack Victory

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What’s included

- 4 × ROCKERON rear feet

- 1 × Front Riser

- Balls are only included if selected as a variation

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Installation (quick & simple)

1. Remove the original rubber feet from your JetBlack Victory

2. Insert them into the ROCKERON Classic parts

3. Mount the ROCKERON feet back onto the trainer frame

A detailed setup image is included in the listing photos.

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Technical details

Material: High-quality PLA (3D printed)

Finish: Matte black

Manufacturing: Designed in Germany, produced with international partner companies

Design: Protected retention geometry

Minor visual variations may occur due to individual production.

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Who ROCKERON is for

- Indoor cyclists who want real movement without a full rocker plate

- Riders looking for adjustable comfort, not a one-feel solution

- Minimalists who value function over bulk

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Important notes

- ROCKERON is not a toy

- Not suitable for children under 14

- Always use on a flat, stable surface

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Questions or feedback?

Contact us anytime via chat or at info@minijim.com

Looking for a different trainer model?
Visit our shop to discover other ROCKERON solutions.