In March 2016 Grube paired up with Luke Patience in the 470 class. Patience had already qualified for the 2016 Olympics alongside Elliot Willis but was forced to find a new partner and requalify after Willis was diagnosed with bowel cancer and had to withdraw to undergo treatment. They took part in a World Cup event at Hyeres in France, despite suffering a black flag disqualification in one race they finished tenth overall. In May 2016 Patience and Grube were confirmed as the Great Britain team's entry for the men's 470 in Rio.