Red. "Magna Great Divide" No idea about tire size. Definitely not a full sized adult bike but just a little bit smaller. I know nothing else about it except that it was my younger sister's and she didn't have room for it in her Mustang when she packed up her car and moved...She is a petite 5'2'' and the tires felt a bit small but she would still ride it around the neighborhood. The brakes need a little love but otherwise seem to be in good condition. The original seat was replaced with a MUCH comfier "Bell Air Gel" seat (pic attached). $30 If interested, please email or call or text 561-703-1744. Thanks, Sylvia