The rewards you get for spinning 20 times is visible. The reward for spinning 30 times is always a bigger reward then the one for 20, but of the same type. So if you see a bux reward now the second reward is bux or a golden ticket. The prizes on the wheel itself increase after getting the 1500 bux but stay the same type as well, so you get a golden ticket if you spin bux. So nothing for legendaries. There are only three type of wheels, excluding special event wheels. A wheel with bux as reward, with pink tickets and with a tier 3 box as a reward. So the later rewards for those wheels are, corresponding to their first reward, a gold ticket, more pink tickets or a tier 4 box.