Its an 80's kids US Express so it has 24 inch wheels. The seat tube is pretty long for a bike like this at about 19" and I used a cheap stem riser to get the handlebars up high enough. Its pretty comfy I am about 5'10. I haven't been riding it too much lately since its slower than the road bikes I have been riding lately. Its pretty fun to bomb around on and I like its smaller size maneuvering it around through doors and stuff.