[2] Grube competed alongside two-time Olympic silver medallist Nick Rogers in the men's 470 dinghy class in an attempt to qualify for the 2012 Summer Olympics in London but the pair were beaten out for selection to the one quota place in the British team by Luke Patience and Stuart Bithell who went on to win the silver medal.

[4] In 2014, Grube teamed up with two-time Olympian Stevie Morrison and finished fifth in their first race together at the World Cup event in Melbourne, Australia.

[2] At the 2014 ISAF Sailing World Championships held in Santander, Spain Grube competed in the 49er class alongside Morrison.

The pair finished 11th and were then dropped from the Royal Yachting Association (RYA) elite Olympic Podium squad.

[11] In March 2024, Grube won a silver medal in the mixed category at the 470 World Championships in Mallorca, Spain, alongside Vita Heathcote which, when combined with another British boat coming ninth, was enough to secure a last-minute qualifying for place for the 2024 Summer Olympics.