Hey, I have a ghetto tubeless set up using 20" BMX tubes. It works great, but I also have the 3M tape over the rim holes. I don't know if it's necessary, but I haven't tried it without. My set up is very similar to this. I am running non-tubeless tires, non tubeless rims, and stans sealant. It's very light and cheap. Here's how I did it: 1. Stretch a 20" tube over the rim, installing the valve stem, etc. Use a 24" if you have 29" wheels. 2. Find the seam or line of the tube opposite the valve stem. Using a scissors, cut the tube there, and then cut lengthwise along this line for the entire tube. Stay centered on the outside of the tube. 3. Fold the cut edges out so that the inside of the tube is exposed. 4. Mount your tire. This is harder than normal with the tube in there. The idea is to pinch the bmx tube in between the rim and the tire bead. Mount the first bead, and then mount most of the second bead. 5. When most of the 2nd bead is mounted, pour in your sealant. Then mount the tire completely. 6. Pump it up! Pump it up really fast, or use an air compressor. You'll hear a bunch of hissing, keep pumping like mad. 7. When the tire is inflated, and only hissing mildly, shake the wheel, rotate it every which way, etc, to distribute the sealant. 8. Once it's not hissing, Use a scissors to trim off the excess flaps of tube sticking out. 9. Ride. ALSO: Continental makes presta valve tubes with removable valve cores. You can use these to refill sealant, or just unmount some of the bead, and pour it in.