I live in a pretty hilly area and last week I installed this freewheel https://www.amazon.com/dp/B07XYNSHZC and this crankset https://www.amazon.com/dp/B072N56W2N on my Fucare Gemini. It's great, wish it had come from the factory like this. I can pop down to 1st gear for hills and work my way up the gears still pedaling at 30mph. No more hampster wheeling!

I went with 11-28 freewheel for my x class. If the rideal has rhe same 14-34 freewheel 7spd the x class has it'll work. I can stand up pedal at full speed.