In Daily Dash we select which bike is used each day. You have to race on that bike and cannot select a different bike. This is part of the challenge! It takes skill to learn all the bikes and to be fast on every one of them!
Don't sweat it if you don't own the day's selected bike in the game. We will automatically put you on the correct bike, even if you don't have it unlocked in other modes.
You can see which bike you'll be racing on for the day right below the track title.
Pro tip: equip the bike of the day in the garage and run some practice laps on a Career track before jumping into your Daily Dash race. This will get you used to the physics of that specific bike if you haven't raced it in a while. The last thing you want is to loop out and crash on your first attempt! BRAAP!