How World Champions roast on the Nucleus LINK — with Jerome Rosler & Sam Corra

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How World Champions roast on the Nucleus LINK — with Jerome Rosler & Sam Corra

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The Nucleus LINK is used by more World Brewers Cup and World Barista Championship competitors than any other roasting machine. In this 65-minute webinar, Jerome Rosler and Sam Corra from Nucleus Coffee Tools walk through the exact roast profiles, competition case studies, and setup decisions that have taken athletes to the top of the podium — and answer your questions live.

What you'll learn in this episode:
— How the Brewers Cup score sheet works: aroma, flavor, aftertaste, acidity, sweetness, and mouthfeel — and which profile attributes move each score
— Four real competition case studies with actual roast curves: Eileen, June, Justin, and Een (including a rare Eugenioides roasted at Singapore National Brewers Cup)
— How to match the right Nucleus LINK profile to the cup attribute you want to maximize
— The full story behind the Addis profile pack: from the 2021 World Championship foundations to Addis 4.1.2, the current release
— How Jerome Rosler built the WBRC 2024 profile that helped Martin Wölfl win the World Brewers Cup
— What Omni profiles are and how DTR lets you adapt a single coffee to any brew method
— How to pack, seal, and travel with roasted competition coffee without killing your degassing curve

What the experts say — key facts from this episode:

Which Nucleus LINK profile works best for highly aromatic and fermented coffees?
Filter E. Short total roast time (6:40–7 min), fast drying phase, development at 8.5–9% DTR over 30–40 seconds. Designed to highlight fruit-forward aromatics without amplifying heavy fermentation notes.

How was Martin Wölfl's 2024 World Brewers Cup profile built?
Based on filter C from the Addis 3.0 pack. Jerome Rosler shifted first crack 5 seconds earlier, raised the temperature increase rate from 6°/min to 7°/min, and shortened development to push solubility — the key variable for Wölfl's winning cup.

What is the Nucleus LINK Addis profile pack?
Addis is the current Nucleus LINK profile system. Named after the 2021 World Barista Championship host city, it has evolved across four versions: Addis 2.0 introduced filter profiles built around Nicole Battefeld-Montgomery's 2022 Worlds approach; Addis 3.0 refined filter C for Martin Wölfl's 2024 WBRC win; Addis 4.1.2 — the current version — adds espresso and Omni profiles for full brew-method coverage. Previous versions were also shaped by input from Sasa Sestic and Agnieszka Rojewska.

How do Omni profiles work on the Nucleus LINK?
Omni profiles use DTR (development time ratio) as the single adjustable variable, allowing the same coffee to be adapted across brew methods — from espresso to filter to cupping. Built to make washed and unconventional varieties competitive without needing separate profiles for each method.

Where can you buy the Nucleus LINK in Europe and get profile support?
Roast Rebels is Europe's authorized Nucleus Coffee Tools distributor and most experienced service center, with locations in Germany and Switzerland. Free shipping across the EU. Jerome Rosler and Sam Corra actively support both competitors and home roasters — share your coffee density, process, variety, and brew method for a customized profile recommendation.

Links:

Nucleus LINK Sample Roaster: roastrebels.com/en/nucleus-link
Nucleus Coffee Tools: roastrebels.com/en/nucleus-coffee-tools
Roast Rebels Shop: roastrebels.com/en

About Roast Rebels:

Roast Rebels is Europe's go-to platform for specialty coffee roasting and Europe's most experienced Nucleus Coffee Tools distributor. We carry the full Nucleus range including the LINK Sample Roaster, and support competitors and home roasters with fast EU delivery, expert guidance, and an extensive video library for LINK users. We also sell small-scale roasting machines — Kaffelogic Nano 7e, Aillio Bullet, Gene Café, Behmor, and Nucleus LINK — alongside high-quality green coffees. Service centers in Germany and Switzerland.

roastrebels.com/en
roastrebels.com/en/nucleus-coffee-tools

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