Rider setup

Is it possible to change rider / bike set up after initial setup ?

Press ‘T’ I think it is while the app is open.

Also it can be done at the end of the race

Yes, just press t to open up rider customization. For more shortcuts and info check out the unofficial guide: https://docs.google.com/document/d/1WZ3rvtip6WNjGOszANnpZUYEAnkAlVvRqa6MvnHhst4/edit