Will these fit my current wheels without clearance issues?

45mm height clears most standard and low-offset wheels. If you're running deep-dish or heavily concave designs, test-fit one cap before committing to all four — spike depth may contact the wheel face on extreme offsets.

Do these caps seal the valve stem or just cover it?

These are protective covers only — they sit over the valve stem cap to block dirt and moisture. They don't replace your existing valve stem caps; they layer on top for aesthetic and added protection.

How do I keep the red finish from fading?

The anodized coating is UV-resistant and holds up well in sunlight. Rinse with fresh water every few months to remove brake dust and road salt buildup. No special wax or sealant needed — the finish is self-protective.