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One Lap of the Web: The Economist talks cars, Maria Sharapova's Porsche and crazy bikers

We spend a lot of time on the Internet -- pretty much whenever we're not driving, writing about or working on cars. Since there's more out there than we'd ever be able to cover, here's our daily digest of car stuff on the Web you may not otherwise have heard about. -- Have you ever seen two motorcycles going wheel-to-wheel at 200 mph in the rain?

Citroën Cactus concept with Air Bump technology confirmed for Frankfurt debut [w/Video]

Citroën's Cactus concept featuring a mysterious sounding 'Air Bump' technology will be taking center stage at the carmaker's stand at this year's Frankfurt motor show. The carmaker has released just one image of the concept along with a 21-second video (see left) showing a spongy panel labeled ‘Air Bump' being poked. Although this doesn't really tell us much about what this new technology actually does, we suspect the panels featured in the video are inserted into the bumper and can protect it from the smaller-scale collisions that can happen in everyday life.

Mercedes plans electric version of SLS AMG supercar

Huge news at Mercedes-Benz: Engineers from its AMG performance-car offshoot are developing a plug-in electric version of the upcoming SLS supercar as part of a broad-based efficiency program to place the automaker at the leading edge of socially acceptable performance-car motoring. Tentatively planned for production in 2015, the new zero-emission supercar draws heavily on the production version of the yet-to-be-fully-revealed SLS scheduled to get its first public outing at the Frankfurt motor show on Sept. 15.