Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to measure helmet size [title] Determine helmet shape. [step] You should consider helmet shape before measuring for helmet size. This is especially important if you are looking for a motorcycle helmet.

Ending1: Helmets with larger openings near the head are less likely to fit (and to assemble). Cut a length of skinny tape approximately 3 in (7.6 cm) around your helmet area. Ending2: Most motorcycles come with larger frames, especially if they are regular sized. The frame size often impacts the type of motorcycle helmet you will find. Ending3: There are three main types of shapes, which are long oval, intermediate oval, and round oval. The helmet shape matters for most helmet types, though it is more important for motorcycle and riding helmets. Ending4: Helmets should have slots for between 80 and 100 gallons (37.9 to 209.2 liters) of gas and 12 gallons (337.4 liters) of water. If you have a boxy helmet, weight oftentimes falls off the helmet.

Answer format: ending1/ending2/ending3/ending4