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Stroke Matters is PP-05 in the Piston Pin-ups series.

The wrist pin is a small but vital pivot—the silent connector between piston and rod. Its strength and precision govern the stroke that drives power and movement through every revolution. In this seemingly simple part lies the essence of performance: stroke matters.

PP-05 highlights the wrist pin alongside a 1940s-inspired pin-up illustration, marrying mechanical function with classic style. The slogan Stroke Matters is a nod to both engineering truth and timeless appeal, reminding us that every detail in the engine’s motion counts.

This T-shirt is part of the Piston Pin-ups series, a numbered collection of eight designs released one at a time. Each design spotlights a key engine component, forming a thoughtful, collectible sequence for those who appreciate the art and science of classic engines.

Made for those who know that in every stroke, precision and passion combine to keep history moving forward.

PP-05 / Wrist Pin

Piston Pin-ups — Stroke Matters