Really bad frame, worst customer service
I have bought a teifox X18 frame from aliexpress for circa usd 800 on December 2022. I have assembled professionally and stsrt using it in january 2023. I have used the bike for about 600 miles or 1000km and a huge crack appeared in top part of the frame out of nowhere. I have contacted the seller, provided 30 photos and several minutes of detailed videos all for nothing. They mentioned that a crash might have caused the crack and they could not provide warranty. Besides the huge manufacturing fail, there is not a single scratch on the bike. I do not recommend Trifox as a brand, beware!