Your rider's manual says to check before each ride-if you find this impractical choose a day or coinciding event of the week. If you check without an air hose around to fill it, there's a fair chance you won't bother. Your reward will be a safer ride, better handling and braking, more even and longer tread life, piece of mind, etc. Check your oil level. This is even easier.
Most newer bikes have a convenient sight glass for engine oil level.
No more finding a rag for the dipstick. For fans of synthetic lubricants, wait for your BMW to reach at least 10,000 miles before making the switch. The engine and trans needs this for adequate break-in. Use the old dinosaur stuff until then. Service your BMW as directed by your owner's books i.e. schedule.