Do these thread onto my valve stems, or do I need a different mounting method?

They thread directly onto your tire valve stems like a lug nut — no clamps, no adhesive, no extra hardware required.

Will these fit my truck's factory valve stems?

These are 60mm and fit standard tire valve stems. Measure your stem diameter before ordering if you have oversized or custom wheels.

What happens if one cap loosens during driving?

Hand-tighten them during your pre-drive check like you would a lug nut. Thread-locking compound can be applied if you want extra security, but it's not necessary for normal use.