Hi Everyone, Having a problem with my GS specifically a slow leak on the front I cannot solve. I had a new Metzler Sahara 3 put on last year and had the valve stem replaced as well. Tire starts to lose air to about half the desired pressure in about a week. Yesterday, I started with a soap and water test on the bead and valve core - nothing. I pulled the tire off, carefully looked for any sign of puncture - none. I noticed there was a little corrosion on the inside rim shoulder, so I used scotch bright, followed by 600 Grit paper and sanded until it's very smooth. Everything looks fine. Remounted the tire on the rim, filled with air until I had the POP of the bead seating. Adjusted to the proper tire pressure. This morning I had about half the air pressure! I'm scratching my head at this point. The air can only escape from; 1. Puncture 2. Bead no seating fully? 3. Valve stem base or valve core valve leaking. The only thing I can think of at this point is to pull the tire off again, and replace the valve stem with a new one. Has anyone used a bead sealant (there is such a product) to solve such an issue? Good idea or bad idea? Any comments welcome and appreciated.