Electric Bike Action Bike Test: Stealth B-52 E-Moto Bike
as you’d expect it’s wider than it would be on a traditional mountain bike.
Braking is provided by quad-piston Magura MT5 hydraulic disc brakes with 203mm rotors. You can upgrade to MT7 for an additional $750. We’re not sure if that’s a worthwhile upgrade, as the MT5 brake units seem to work very well on this bike.
Stock tires are motocross-style Duro Razorback knobbies. You can also get the bike set up with street slick Schwalbe Crazy Bob tires.
The stock setup has a regular-length seatpost, which we found too tall. The seat tube is open at the bottom and directly inline with the rear shock reservoir, so you’re limited in how far down you can drop the seatpost. Because of this, they gave us a sawed-off seatpost as well, allowing proper
Powering the B-52 is a 3000-watt rear hub motor that peaks at 6200 watts. This is what brings much of the weight to the bike, and it does shift the weight of the bike towards the rear. This actually means the rear suspension has to handle that much extra unsprung weight in addition to its regular impact duties.
The 2-kWh battery is massive and takes up the main part of the frame. It’s a 72-volt system, offering mind-bending amounts of power and acceleration. It is possible to swap the battery for another, though that requires some mild disassembly.
The LCD is located on the top of the frame, very easy to read, though positioned low enough in your field of view to make you look down when you might get yourself in trouble at speed, especially on trails. There are a few button controls to toggle through additional menu items, including being able to geek out on motor temp, control temp, efficiency, regenerated Wh and current voltage (as though range anxiety isn’t bad enough!).
The BMS/controller is mounted on the bottom of the frame with fins exposed for cooling. The whole system is protected from water ingress, so splashing through some streams is fine. They do, however, recommend against pressure-washing the bike.
WHO IT’S MADE FOR
Not beginners. This isn’t a bike for someone commuting to work. It isn’t street-legal. It’s aimed at riders who want to have a capable, fun e-moto for OHV areas. This would be perfect for people with RVs who like to go out and ride in the dirt. It can be configured with Schwalbe Crazy Bob tires, which are more street-oriented, but you’d have to have private paved roads to make this an option.
Turning on this bike requires the key in the ignition instead of a simple button or switch. This is a good thing. Turn it on and the LCD lights up and shows you battery percentage, speed, trip time and how much power you’re using.
How best to describe the B-52 experience in short? It’s scary! The throttle is very responsive, and…