Symptoms
- Slow leak traced to the edge where tire meets wheel, not the tread
- Soapy water test shows bubbles along the rim edge
- Leak persists even after checking the valve stem
Likely causes
- CommonCorrosion or rust buildup on the wheel bead seatRust, especially on steel wheels, creates a rough surface that the tire can't seal against.
- CommonDirt or old sealant residue on the beadDebris trapped between tire and rim during a previous tire change can leave a small gap.
- PossibleBent or damaged rim edgeA small ding right at the bead seat can prevent a good seal.
What to do
- Use soapy water around the full circumference where tire meets rim to pinpoint the leak location.
- Note whether it's isolated to one spot (likely debris or a rim ding) or leaking all the way around (likely corrosion).
- Have a tire shop dismount the tire, clean the bead area, and remove rust or debris.
- Apply new bead sealant when the tire is remounted.
- If a bent rim edge is the cause, have the shop assess whether it can be smoothed or needs wheel replacement.
Tools and parts
- Spray bottle with soapy water
When to call a pro
This repair requires dismounting the tire, so it's best done at a tire shop rather than attempted at home.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.