Bosch’s flagship mountain bike system uses a mini drive ring with internal gearing to send its power to the drivetrain. There’s some resistance in the system over 25km/h, but when you first press down on the pedals there’s an impressive surge of power, and it offers good support over a wide cadence range. Its size has an impact on the width of the cranks (the Q-factor) as well as the chainstay length of the frame, and it’s not the lightest system on the market at 4kg for the motor. On the other hand, Bosch is the most established player on the market, and its system has proven itself over many years.
The gears don't seem to keep up on this bike. There are 21 gears, same as my other bike, but there is much more resistance at the highest gear on my other bike going 20mph than there is on this bike. The reason that is an issue is that during pedal assist, the bike goes pretty quick and I don't want to be pedaling air, I want some, just a little, resistance. I don't know the mechanics of it or how this would be the case, perhaps because this bike has smaller wheels than my other bike? The bike came pretty well adjusted on the derailleurs. I haven't touched the back but the front I've had to mess with a little. The chain fell off outboard once, so had to adjust. Chain guard did its job well. The chain got stuck pretty good, but once I loosed the chain guard everything was easily moved.
Ancheer Electric Mountain Bike SERVICE AVAILABLE --- With one-year warranty for the electric motor, battery and other parts except for frame, no worry about using it. This bicycle arrives 85% assembled. It's not hard to finish aseembly by yourself. The assembly service on this page is provided and charged by Amazon’s third-party company, if you can't finish by yourself, click on the “Select Assembly ” button above; choose "Ship to store for assembly and pick up".
A couple of weeks in, I had a wreck (brakes were mounted reverse of what I'm used to; front wheel locked up during a turn). The half-throttle/light/horn assembly was damaged beyond repair. Emailed the official company account and the supposed owners' account several times; no response. I had to buy a near-identical part from a Chinese company and re-wire it myself.
The suspension works, but there isn’t any true dampening. That means you’re just riding around on springs. On a real full suspension e-bike (i.e. a few thousand dollars) you get actual oil-dampened shocks. Those absorb bumps and dampen the shock. With springs, the bike bounces a few times after bumps, with the energy dissipating through the spring stretching and compressing.
It is a nice bike for the money, it has some nice features. However the instructions did not fit the bike model. The given web sites noted in the instructions did not work. Went online and had to visit several other sites to get the instructions for this bike. No one site fit the bike. Very fustrating. It would be nice if the throttle also worked with the other modes. Seat is very uncomfortable. I will change that. Bike was not well packaged. I was glad to see bike was not damaged in shipment.
It is not a off-road motorbike with an electric engine and a throttle. Electric mountain bikes have motors that only work when you’re pedalling. The motor tops-up your pedalling input. It’s called ‘pedal assist’. There are differing levels of assistance (called things like ‘eco’ and ‘turbo’) that you select via a handlebar-mounted control unit. The motor also cuts out once you reach 25km/ph (or faster). There are strict limits on the power of electric mountain bikes; 250w is the maximum nominal power. More powerful than that and the bike requires tax and insurance (like a car/motorbike) and is also not allowed on bridleways at all. 

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Overall, you’re not going to get a foldable electric mountain bike that’s better than this at the price that Ancheer are selling it for. It’s well built and designed, it’s easy to use and put together and it makes mountain biking so much more fun whilst opening it up to more people. If you’re looking for a versatile e-bike that is just at home on the mountain as it is on the morning commute, all for waaay less than $1000 then this might just be the bike for you.

I’m sure the can of worms has already been opened on this subject… Oh it’s motor bike blah blah they should be banned, is this whining mostly from strava whippets who’s times might be beaten? I raced motocross for 12 years & they are motorcycles with a internal combustion engine and yes they do make a mess of the country side but on land that has been allowed & nowadays has planning permission to be used for such events.
Had my first crash on this bike. Right at the 500 mile mark mid-November. Sand had blown all over the bike path and I took it too fast. The bike did ok, but when I picked it back up the motor wouldn't work. I pedaled the rest of my commute and got a ride home. I suspected (and was correct) that the left brake lever was bent and the motor was not able to engage because it thought I was braking. I was nervous muscling it back, but it wasn't bent too bad. So that's what I did. And I also took the time to replace both wheels, inner-tubes, and give the bike a cleaning. The front wheel was still ok on tread but the back wheel tread was completely gone. Changing the front wheel was easy. The back wheel was more challenging because the motor cables and disc brakes. Ended up leaving the wheel on the bike and just moving it slightly to get the tube and wheel in place. Ended up just being more annoying than difficult. The chain cleaned up nice with some Simple Green. I haven't ridden on the commute nearly as much with me feeling a little more cautious and it getting dark so early (I don't need to wipe out in the bike lane into traffic...) All is well though. Have had zero issues with the motor since bending the brake back to its (or close to its) rightful position.
A couple of weeks in, I had a wreck (brakes were mounted reverse of what I'm used to; front wheel locked up during a turn). The half-throttle/light/horn assembly was damaged beyond repair. Emailed the official company account and the supposed owners' account several times; no response. I had to buy a near-identical part from a Chinese company and re-wire it myself.
SERVICE AVAILABLE --- With one-year warranty for the electric motor, battery and other parts except for frame, no worry about using it. This bicycle arrives 85% assembled. It's not hard to finish aseembly by yourself. The assembly service on this page is provided and charged by Amazon’s third-party company, if you can't finish by yourself, click on the “Select Assembly ” button above; choose "Ship to store for assembly and pick up". 


12 Month Financing: For a limited time, purchase $599 or more using the Amazon.com Store Card and pay no interest for 12 months on your entire order if paid in full in 12 months. Interest will be charged to your account from the purchase date if the promotional balance is not paid in full within 12 months. Minimum monthly payments required. Subject to credit approval. Apply now.
To fit it, a shorter handlebar grip is supplied and you'll have to unscrew the battery mounting plate from the down tube and the black box of wires which hangs behind the seat post. And if you fancy a bit of extra speed, you can unplug the white wire which limits the motor to the EU-regulated 15.5mph. This gives you a few extra mph that'll let you cruise at a comfortable 20mph.

With different degrees of assistance at your fingertips, riders of varying fitness levels are easily accommodated on the same ride too. Which, depending on who’s setting the pace, can bring a social aspect back to big days out, because you can all ride together and the assistance from the motor makes it that much easier to string a coherent sentence together even on the steepest climbs.
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