One thing that separates these two are their warranties.  Rambo offer a 1 year limited warranty.  While Quietkat offer a 1 year limited warranty on all it's components including the battery, but each frame is covered by a lifetime warranty.  Quietkat have been around longer and are a proven, reliable manufacturer.  They've got it figured out and this year's catalog shows just how good they are.  Rambo is a new, small company with big ambitions and a quality product that they can stand behind.

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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.
The bikes we tested all use a different e-bike motor system, and the controls, the primary user interface, are an important element we rated but didn't weight as heavily as some of the others. Each motor system and its associated controls are slightly different. Our primary interest is in how user-friendly is it to interact with the system, how intuitive and ergonomic are the shifters, how good and easy to read is the display, and how easy is it to charge the battery? Each drive system also has a smartphone app that is intended to allow the user to fine-tune the motor's support settings, create custom settings, monitor battery charge and health, and a whole lot more. We don't feel the apps are necessary for the use of any of these e-MTB's, but those with an affinity for technology or personalizing your ride may be inclined to use them.
Firstly this is not a motorcycle. I bought this to use as a daily commuter.I now have 1000 + miles on it. The pedal assist works fine and may be ok for leisurely riding but I just use the throttle and pedal. This is a great bike. Strong frame and wheels. Been in two crashes and no damage. The tires are nice off road tires and now live on my daughters mountain bike. I switched them out for high pressure road tires. Forget about the horn and light. They don't work. I am 6'1" 32" inseam and had to buy a longer seatpost($30) to fit this frame. 13miles each way commute. Battery life is fine. After the 26 mile round trip it has a little juice left but not enough for another ride to work. I would buy again.
Powered by a 250-watt Brose Centerdrive system, the Redux is capable of reaching speeds of up to 28 mph, which comes in handy when dodging traffic. The lithium-ion battery provides enough juice to give the bike a range of up to 80 miles between recharges, making it a great option for daily commuters. Raleigh even outfitted the bike with wide tires which provide stability and traction, even when the road gets wet. Other key features include a 10-speed Shimano crankset and shifters and a built-in LCD screen that displays all the usual information.
Electric bicycles offer the same great benefits as traditional bicycles and remove many of the roadblocks and challenges that people face with traditional pedal-powered bikes. With help of an electric motor you can get where you need to be faster, climb hills effortlessly and significantly reduce your carbon footprint. Also e-bikes don’t require registration, license plates, or insurance. So how come the electric bikes are have not taken over the world by now? The real problem—even now that e-bikes have been available for years—is cost. 

While my first reaction to the surge in fat tire bikes made for hunting was one of curiosity, that has turned to excitement for trying out this new mode of transportation. Will this be another of those trends that ends up as a bit of hunting history, or will they find a niche that offers long-lasting usefulness? Speaking as a DIY bowhunter, let’s hope it’s the latter.
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Due to high total weights of over 20 kg, it doesn’t matter whether the scale stops at 21.44 kg or 22.2 kg for a modern eMTB. In our test, the difference between the lightest and the heaviest bike was just under 4 kg. This is not to be ignored… but a little extra weight in the form of functional, reliable componentry is better than an ebike designed and constructed to be as light as possible, at all costs, but which ends up in the workshop more often than on the trail.
They’re much more undetectable than dirt bikes and ATV’s: Animals work off of their senses, and as a hunter, you already know that loud noises will scare off the game, and lots of movement will make game and fish that much harder to catch. Not only that, but the smell of gas and even your sweat can send prey running. An electric motor doesn’t rev as loud or make anywhere near the amount of vibration as gas engines do. You and your bike won’t produce a bunch of unwanted odor when you ride, so you’re looking at a better chance of getting your kill faster and more efficiently with an e-bike.

The Surly Big Easy is the Cadillac of the bike lane. The company’s new longtail e-cargo bike exudes a “they don’t make ’em like this anymore” stature, thanks to a beefed-up chromoly steel frame rolling on tough 26x2.5-inch tires. And because it’s a class 1 e-bike, you can actually ride it in the bike lane, too. The 7-foot-long, 67-pound bike won’t play well with your third-floor walk-up, so it’s best to think of it as a car supplement or replacement—that’s what Surly intended, anyway, as evidenced by the $5,000 price tag. However, if you’re ready to commit to the cargo bike life, you’ll struggle to find a stronger platform for achieving bike commuter nirvana.
Amazing bike, quick. On the flat average 21mph full power, after 3-4 miles average 18mph. A lot of hills in SoCal so this 1/3 hp motor does it’s job well with pedal assist on very steep grades. With electric only mode and heavy, steep, long hills this bike does its job pushing through a 16 mile commute with some energy to spare with a 190lb load of me and my gear. This bike could do much more with flat and pedal assist modes maybe twice as far. Recommend you use smaller tires 1.75 vs the standard 1.95 to achieve my results. Continental contact travels work great!
Versatility Electric bikes are great for helping a rider keep up with a significantly fitter person. You will be able to go further with much less effort. And, eBikes make it practical to do things like effortlessly carrying a basketfull of groceries or ridiing with kids. You will soon find that electric bicycles make your life easier and more convenient in many ways. There are no special requirements since eBikes classified as bicycles, so no license or registration is required.  Even more, eBikes let you sneak through gridlocked traffic and are very easy to locate parking for.  You can recharge the battery to about 75% in 45 minutes, so they are always ready to go. How fast do electric mountain bikes go?
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