Electric mountain bikes have garnered a lot of attention for their ability to help riders go higher, further, and faster on the trail. As a result, there have been some impressive new eMTB models to hit the market in recent years, making it easier than ever to head off-road. Our favorite is the Haibike SDURO HardNine, which comes equipped with a 350-watt Bosch Performance CX drive and a 500 watt-hour battery. This gives it a range of up to 70 miles, along with a top speed of 20 mph, which is plenty fast on singletrack.

But if you’re coming back from injury, looking to ride more miles in a shorter period of time, or just ride further without getting exhausted, then the Turbo Levo is just amazing. This bike is the great equalizer. Some may see that as a negative, lowering the sport’s barrier to entry, but we think more people on bikes can only be a good thing. It will make returning to mountain biking after the birth of a child, an injury, or a stressful period at work much easier. Life happens, the electric assist bikes like this Turbo Levo will help more people ride more often. 
The demands for the best eMTB are high. It has to climb efficiently, be comfortable to ride, be very stable and composed, yet, on top of that, be a lot of fun on the descents. Also, its integration, ease of use, and motor performance must set the benchmark. Although all the motors perform at a high level, the Bosch Performance CX is unable to keep up with the competition due to the high internal resistance it generates at over 25 km/h. It’s a pity for the Moustache Samedi Race 11: it’s by far the best Bosch bike we’ve ever ridden, but it’s slowed down by the motor. With a price tag of € 5,999, the Trek Powerfly 9 LT Plus is clearly the cheapest bike in this group test. It climbs very efficiently, but is held back on the downhills by a poor choice of tyres and slow handling – you should consider a tyre upgrade in your budget. The Haibike XDURO Nduro descends with the stability of a freight train, but it has to let the competition overtake it when going back up. With its long 180 mm travel and high weight (24.54 kg), it even feels cumbersome on the downhills.
E-bikes use rechargeable batteries, electric motors and some form of control. Battery systems in use include sealed lead-acid (SLA), nickel-cadmium (NiCad), nickel-metal hydride (NiMH) or lithium-ion polymer (Li-ion). Batteries vary according to the voltage, total charge capacity (amp hours), weight, the number of charging cycles before performance degrades, and ability to handle over-voltage charging conditions. The energy costs of operating e-bikes are small, but there can be considerable battery replacement costs. The lifespan of a battery pack varies depending on the type of usage. Shallow discharge/recharge cycles will help extend the overall battery life.
E-bikes can also provide a source of exercise for individuals who have trouble exercising for an extended time (due to injury or excessive weight, for example) as the bike can allow the rider to take short breaks from pedaling and also provide confidence to the rider that they'll be able to complete the selected path without becoming too fatigued[58] or without having forced their knee joints too hard (people who need to use their knee joints without wearing them out unnecessarily may in some electric bikes adjust the level of motor assistance according to the terrain). A University of Tennessee study provides evidence that energy expenditure (EE) and oxygen consumption (VO2) for e-bikes are 24% lower than that for conventional bicycles, and 64% lower than for walking. Further, the study notes that the difference between e-bikes and bicycles are most pronounced on the uphill segments.[59] Reaching VO2 Max, can really help your body as a whole[60]. Professor Janet Lord of Birmingham University in the UK published a study that looked at older cyclists, ““The study looked at muscle mass, blood cholesterol, their VO2 Max, lung function, and in many of those measures we found they didn’t age! No loss of muscle, their bones were a little thin (but nothing like the general population), their blood pressure didn’t go up.[61]
E-bikes use rechargeable batteries and the lighter ones can travel up to 25 to 32 km/h (16 to 20 mph), depending on local laws, while the more high-powered varieties can often do in excess of 45 km/h (28 mph). In some markets, such as Germany as of 2013, they are gaining in popularity and taking some market share away from conventional bicycles,[1] while in others, such as China as of 2010, they are replacing fossil fuel-powered mopeds and small motorcycles.[2][3]