Can the valve stem bend like this on its own? I came out to ride my bike home today and the valve cap was gone and the tire was flat. I am

Do tire valve caps stop air coming out, or just stop debris getting in the valve? - Quora

How to Replace a Bike Tube (with Pictures) - wikiHow

Replacing A Tire Valve Stem Without Special Tools!

How do You Even Bend the Stem On a Presta Valve?

Tire Makers Co-Develop an Inflatable Bladder System to Prevent Flat Tires - Pinkbike

Schrader Valve vs. Presta Valve

Do You Know How to Build a Wheel? - Pinkbike Poll - Pinkbike

Poor Design? What is with these valve stems - Mods, Repairs, & DIY - Electric Unicycle Forum (euc community)

How To Custom-Build Your Own Ultimate Expedition Touring Bike

Will I lose more air in my tires faster if I am missing the cap where the air goes in? - Quora

How to Get Leaky Tubeless Bike Tires to Seal Again - Singletracks Mountain Bike News

Schrader Valve vs. Presta Valve