The House Edge on this bet is the same as it is for the other main roulette bets: 5.26% for American Roulette (2 zero pockets) and 2.63% in a single zero European Roulette Wheel. On an American Roulette Wheel, your odds are 2:38 for each split bet or 5.26%). If you place one split bet on a European Roulette Wheel, you have a 2:37 chance of winning (5.4%) You couldn’t make a split bet on 27/28 as they are not adjacent on the table.
In the example above, we have placed split bets on 22/23, 22,25 and 16/19.
