Found the model or their website: https://www.rcb-scooter.com/products/rcb-rk6-fat-tire-folding-electric-bicyclercb-e-bike

The things I look for when buying an ebike are the following:

- Watt-hour (Wh). Saw that the this model (RCB RK6) has 561.6 Wh, mine has 720Wh and that allows me to cycle for about 4 hours around the city and I only consume around 40 to 50% of the battery, depending on some conditions like the inclination of the roads, which PAS mode you are using, etc...

- Torque. The RK6 has 60Nm of torque, which should be enough if you are riding on flat roads. In my case, I had to look for an ebike that had high torque like 90Nm because I have to go uphill a lot of times carrying cargo like groceries on the rear rack.

- Type of sensor. I think this one is more of a personal preference, some people like Torque sensors while others prefer Cadence sensors. In my case, I like the torque sensor because it feels more like a normal bike and you have more control on the speed because the harder you pedal, the faster you go, the slower you pedal the slower you go, like a normal bike. With cacende sensor, you only need to pedal, doesn't matter how hard, and the motor will start working regardless of which gear you are on. That one works well if you don't want to get tired when working as a bike delivery driver.

- Post customer service. I have no experience how RCB as a company because I've never bough anything from them. In case of Engwe, I have to tell that I had a good experience with them. Since the Engine Pro was my first ebike and I had no previous experience, they answered all the questions I had by email, like when I wanted to bleed the brakes, they even attached a tutorial they made so I could follow, and even offered to cover the expenses when I had to take the bike to a mechanic because I had a problem with the bottom bracket. They take a couple of days to answer the emails though, but that wasn't a big problem for me.

One thing I noticed while looking at the picture of the RK6 is that the brakes seem to be a mix of hydraulic and cable, just like the ones that the Rattan LM Ultra has. The people that reviewed that bike tend to say that they don't like the "feeling" of those types of brakes and that the customer should change them for a hydraulic brake system. I've never tried them so I cannot give you an opinion about them.

Hope it helps! 😄