For $6,900 you can get your hands on – or your seat onto – a Zero X …the quiet electric bike touted as having “the world’s best acceleration, agility and durability of any in the motorcycle in the market, electric or gas.”

Powered by a lithium-ion battery, it weighs 120 pounds, goes from 0-50 miles in “a flash” and best of all for your neighbors (or sneaking into the house), it is silent.

Brammo’s Enertia is a plug-in bike that does 0-60 MPH in under 4 seconds and can go for up to 50 miles on one charge. Brammo is the Ashland, OR manufacturer that designed and built the bike, and claims it can reduce a commuter’s carbon footprint by 92 percent. It comes with six 12 Volt lithium-phosphate batteries, which don’t blow up when punctured (like the Lithium Ion ones) Since it does not need a fuel tank, it weighs only 275 pounds, 86 pounds of which are the batteries. If you live in an apartment, you can carry it up the stairs and you have completed your workout for the day as well! Autos MSN