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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.

2015 BMW X4 xDrive28i

When BMW unveiled the X6 back in 2008, critical reviews were mixed, to say the least. By all accounts, the heavyweight crossover actually drove quite well, but the idea of a BMW X5 that traded a lot of functionality for polarizing looks and a higher price tag seemed like a tough sell. Then it went on sale and quickly proved to be a cash cow. Today, the German brand has moved over a quarter million of the things worldwide. Unsurprisingly, this success has moved BMW to double down on its so-called Sport Activity Coupe by adding a smaller variant. The all-new X4, while not a bad steer in and of itself, makes even less sense than its big brother, particularly when viewed alongside BMW's other offerings. Like the X6 and X5, the X4 borrows heavily from another of the brand's utility vehicles, in this case, the less-costly X3. Also like the X6, this new crossover-coupe's styling is sure to cause a schism among critics and consumers alike. You can probably guess where the majority of the Autoblog camp falls. To be totally frank, the exterior of the X4 is simply ghastly to this writer, particularly in this tester's eye-catching paint. Admittedly – and much like the X6 – there's not much objectionable from the A-pillar forward, where the X4 has a lot in common with the X3. It's only once moving towards the rear that things well and truly go wrong. There's just so much visual mass, and it's been made worse by the way BMW designers wussed out. Bear with me. Compare the profile of the X6 with the X4, and pay particular attention to the roofline on the bigger vehicle. The angle of the roofline is noticeably more dramatic on the X6, which comes at the expense of second-row headroom (an oft-criticized area for the big boy). For the X4, designers tried to have their cake and eat it too, maintaining second-row headroom but with a coupe-like profile. The result is an X4 that is bulbous and uncouth from the B-pillar back, more hunchbacked Gran Turismo than svelte Gran Coupe. BMW might have been better served if its exterior work had followed the stylings of the cabin, which is more or less a clone of what's on offer in the X3. Material quality is still great, with soft-touch plastics and available cool-to-the-touch brushed aluminum throughout. I really dug the Ivory White Nevada leather and contrast red stitching on this test vehicle, as it provided an eye-pleasing departure from the sea of blacks, grays and tans so typical of the luxury crossover market.

BMW i8's three-cylinder sounds like it's shaping up quite nicely

We've run across some rather interesting news... or perhaps we should say interesting sounds. The folks from Bimmerpost have scrounged up a short video showing a preproduction BMW i8 running through a few gears in Sport mode at a quick pace, and if you were concerned that the somewhat eco-friendly nature of the upcoming German sports car would neuter its ability to stir the aural senses, fret not.
Judging by the lovely noise coming from the engine compartment of the i8 in the video, BMW's expertise in tuning high-strung, small-bore engines - remember, BMW Motorrad has quite the penchant for well-conceived motorcycle engines - has come through loud and clear. Now, it's worth mentioning that BMW's controversial Active Sound technology will be included with the i8, so the production car may not sound exactly like this version, which is running with the tech disabled. Owners won't have the ability to disable Active Sound on production i8s.
In related news, Bimmerpost reports that BMW will equip the i8 with an external Active Sound Design system to go along with its Pedestrian Protection System. That means those on the outside will likely hear piped engine recordings from the rear and a sort of "howl" from the front in order to warn pedestrians that the otherwise quiet (when running on electricity, that is) car is approaching. It will also feature technology that can stop the car before contacting a pedestrian.