Have ever heard that theory? The 'betting the last number' theory. I'd like to comment on that 'betting the last number' theory. So, I think so -- even if it is correct (that 'every wheel has a slight bias"), this however, does not necessarily mean that betting the last number means you're going with the bias. Biases can be found when you collect the results of thousands or tens of thousands of spins, etc. So, my conclusion is that in the (very!) long term you will have a very slightly less disadvantage to the house. So, I do not recommend it, because practically it's nothing special.