While wearing a motorcycle helmet as a bicycle helmet might offer some level of protection, it is generally not recommended. Motorcycle helmets and bicycle helmets are designed and tested for different types of impacts and conditions.
Motorcycle helmets are built to withstand high-speed impacts and provide additional protection for the head, face, and neck. They are usually heavier and provide more coverage compared to bicycle helmets. They also have a different design to accommodate features like a face shield, ventilation, and noise reduction.
On the other hand, bicycle helmets are designed specifically for lower-speed impacts that are more common in cycling accidents. They are typically lighter and offer better ventilation to keep the rider comfortable during physical exertion. They also have a different shape and construction that focuses on protecting against the types of impacts commonly experienced in cycling accidents, such as falls and collisions at lower speeds.
While wearing a motorcycle helmet while cycling may provide some protection, it can also have drawbacks. The heavier weight and different design of a motorcycle helmet may reduce comfort and increase fatigue during longer rides. The increased coverage and reduced ventilation may cause overheating and discomfort during intense physical activity.
It is always recommended to use the appropriate helmet for the intended activity. If you engage in both motorcycle riding and cycling, it is best to invest in separate helmets designed specifically for each activity to ensure optimal protection and comfort.