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You didn't specify if you're building a phone or tablet application or both. I would suggest carefully considering what you're presenting in your navbar if you need more than 5 items as it isn't likely to fit well on smaller screens. Not all consumers have the latest and greatest devices with 5"+ screens. Don't forget about your users that may be on older devices that don't have the screen real estate of the latest and greatest phones/tablets. A navbar with six items may end up being too small and difficult to use on older devices with limited screen real estate (think about some of the BlackBerry devices).If more than 5 items are added, the navbar will simply wrap to multiple lines: