What Is The Biggest Risk Ever Taken By An Automaker?

The 2015 Ford F150 is the first pick up truck to eschew steel and go for aluminum. It's lighter weight will be a boon, but will buyers think that aluminum is as tough as steel? It's a risk. What's the biggest risk an automaker has ever taken?

A lot of automakers are afraid to make big changes or go out of their comfort zones as it could cause a backlash amongst customers and brand loyalists. The F150 is one of the best selling vehicles in the world, so changing everything about how its built is a monumental change.

What say you? What is the biggest risk ever taken by an automaker?