There are only a few electric mountain bikes on the market, but electric motors can certainly assist with off-road riding. You can also build you own electric mountain bike by installing an electric motor kit onto an existing mountain bike. There’s also the Biontague, which is a mountain bike that has a electric kit pre-installed.
The best value for an electric mountain bike is the E-Zip Mountain Trailz Electric Bicycle, made by Currie Technologies. I’ve found that the range of a fully-charged battery is about 20 miles — that’s if you make liberal use of the electric assist. If you just use it to go up hills, the charge will last for about 30 miles. You can also add a second battery for $120 from Currie Technologies, that will double your range (but it will also increase the bike’s weight).
It’s available from Amazon for $368.
The Liberty Stealth Climber Mountain Bike is sold by Liberty Bikes in Pennslyvania. This bike has a 450 watt 36V motor and it’s powered by a lithium-ion battery. Electric-assist is engaged with a throttle, and motor will get you up to 18 mph. If you want to go faster than this, you can provide further pedal power using the 6 speed gears.
Weighing only 68 pounds, this mountain bike comes with our front and rear disk break systems. It also has built-in shock absorbers, and front and rear lights. Charging time is 4-6 hours, and the range is 20-27 miles. The bike is priced at $1275, but it looks like its being sold on eBay for $900.
Link: Liberty Electric Bikes