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Check out the trick way you access the tire valve on this BMW Alpina B6

The wheels are one of the first things you notice when checking out the 2015 BMW Alpina B6 xDrive Gran Coupe. The 20-inch aluminum alloy rollers have 21 spokes that spray out from their hubs, creating one of Alpina's signature design features. But there's also plenty of function to go along with the stylistic form of this hotted-up BMW 6 Series Gran Coupe.
By rotating the Alpina roundel and unlocking the center hub, you gain access to the tire valve and bolts, which are hidden inside. They're literally kept under lock and key, and they protect your Alpina's wheels from the elements and theft. This unique center-fill system employing a hollow spoke isn't a new setup for the favored BMW tuner, but since Autoblog had one in our offices this week, we thought we'd take the opportunity to show the unique mechanism in case you haven't seen it before. Check it out in our brief video below.

Looking back at 84 years of BMW roadsters

Today BMW is a top player in the luxury vehicle market, but it wasn't always so. With origins as an airplane engine builder early in the 20th Century, it broke into the automotive industry when it bought Automobilwerk Eisenach in 1928. That German manufacturer was licensed to build the Austin Seven under the name Dixi DA-1, which could be had in a roadster body style. In 1929, BMW dropped the Dixi name, and by 1936, it was building a car it designed in-house, the 326 sedan. That was followed by the company's first roadster of its own design, the swoopy two-door 327 of 1937.
XCAR picks up there, and gives a history of BMW's iconic roadsters starting with the 327, ending with today's Z4, and covering everything in between - including the beautiful post-war 507 of 1957 and the funky, plastic-bodied 1989 Z1.
The video, which we've included below, is a good history lesson and a great chance to see a bunch of classic BMWs, spanning 84 years, all driven back to back within the safe confines of a racetrack. When you have a spare 20 minutes, go ahead and take some time to watch it.

BMW i8 will be first production car to use Gorilla Glass

What do smartphones and the BMW i8 have in common? Glass. Scratch-resistant Gorilla Glass, that is. The i8 will be the first production car to use the chemically hardened material, which is more durable, lighter and provides more sound deadening than conventional laminated automotive glass. We thought it would be a natural replacement for windshields, but, according to Autoweek, BMW said it will be used for the rear window for sound deadening purposes. The Gorilla Glass will still be laminated, with two 0.7mm thick layers of it sandwiching an acoustic sheet, reports Autoevolution.
BMW reportedly claims the i8 will weigh less than 3,285 pounds, and to offset the heavy hybrid powertrain to reach that goal the automaker has implemented lightweight materials normally not found in mass-production automobiles. With a carbon fiber reinforced plastic (CFRP) monocoque used for both the (relatively) pedestrian i3 and the upscale i8, it's not surprising BMW was also the first to jump onto Gorilla Glass, especially given the timing of a report that a high-end automaker would introduce it within the year.
Be sure to check out our First Drive review of the i8 to see if BMW's newest sports car is living up to the hype.