Ventum GS1 - GRX Di2ABOUT THE VENTUM GS1 GRX Di2 Shaped by our obsession with speed, the third generation GS1 is our clearest expression of what a gravel bike should be: simple, fast, and focused. To make it faster, we increased tire clearance, cut weight, and improved aerodynamics all without compromising the thing that matters most: handling. What didnt change? The geometry. We kept our proven Ventum Race Geometry aggressive, with a tucked rear end and stable steering.