Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to identify run flat tires [title] Find the words " run flat " on your tires. [step] Some tire brands that make run-flat tires simply label the tire as run flat, making it easier on the car owner. Pirelli tires is one brand that does this.

Ending1: Doing this is the best way to tell if a tire owner stocks the tires themselves or if they buy them out of the store. [substeps] It is not too difficult to find the word " run flat " written on the tire itself. Ending2: [substeps] Simply look for the words " run flat " on the side of your tire, usually near other manufacturer information and numbers. [title] Look for the codes rft, ssr, or dsst on your tires. Ending3: [title] Figure out the cause of your bicycle problems. [step] Bicycling racers have a number of problems with bicycle-certified bikes, so get to the root of your problem by assuming the source of your problems is connection to the bike. Ending4: These two brands most often have the words run flat printed on them. These letters indicate the amount of traction the car needs on the road.

Answer format: ending1/ending2/ending3/ending4