Narrowing of the knee joint gap is one of the manifestations of X-ray and other imaging tests of the knee joint, and is mostly seen in degenerative knee joints and meniscus injuries, etc. Whether or not you can ride is related to the specific condition and the way of riding, and those with mild conditions can ride for short distances and gently, while those in the acute stage and those with severe symptoms are not recommended to ride. When the knee joint gap narrows, there are changes in the knee joint such as osteophytes, cartilage wear and meniscus damage, so if there are acute changes such as severe pain and swelling, riding is not recommended to avoid aggravating the symptoms. However, if the condition is stabilized and there is only mild pain and swelling, you can ride appropriately, but be careful not to ride violently and try to ride slowly and short distances to avoid aggravating the condition. For specific cases, it is recommended to go to the hospital, complete all the examinations, and have a professional doctor decide whether it is possible to ride according to the specific condition.