Keep the valve closed and take some pliers and cut the very tip of the valve. This next step is the most crucial part. Place your thumb below the valve to prevent the needle from falling into the tube.
Hold the pin in place during the whole time. If you lose the valve in the tube, it could mean you buying a new tube. The thorn in the picture we would call a "sand burr" in New Mexico. I have pulled a ton of them out of the dogs fur and my shoe laces. Puncture vine is known locally as "Goat head" and the dry burrs bust into chunks with two spines each that really do look like a goat's head or a bull's head, which is what we called it in Colorado.
The geometry of these is such that one of the two thorns always points straight up when they lay on the pavement. Slime and Presta valves: It is worth using on 28mm or larger tires. I find that the slime won't seal the higher pressure needed for narrower tires. It will seal for 50mm or so, then break loose and spray for another 10meters, wash, rinse, repeat. Finally when my glasses have enough slime spots on them I will stop and patch it.
I have had good luck with it in 28mm tires run at 80psi, so it might eventually keep the air in a narrow tire after enough air leaks out. The slime does make the holes easy to find! Yes, you need to get it all off or the patch won't stick. I carry alcohol wipes in my tool kit for this purpose, and they are also good for cleaning grit out of road rash, and slime and gnat spots off my glasses. Awesome - thanks so much! I found that you don't need a presta-schrader valve adapter when doing this.
Just skip the connector tube and stick the nozzle of the slime bottle right on the presta valve. It fits perfectly - just just have to tip the connection off occaisionaly as you fill to let some air back into the bottle. If you aren't running tubeless and you live somewhere with goatheads, slime is key. They don't make tubes big enough for my current tire size, so sliming my tubes myself was needed.
Reply 5 years ago. This is a really cool idea, thanks. I always heard of removable presta cores, but didn't now they could be pushed "inside". Have you tried this with a lighter sealant such as Stan's? Also, do you feel any difference riding with a much heavier tube now that it has 4 oz of slime inside?
Reply 7 years ago on Step 8. I have not tried it with a lighter sealant. I did not notice any difference in ride quality. I always felt I needed to take extra weight off of myself before I worried about extra weight on the bike. By Phil B Follow. More by the author:. About: I miss the days when magazines like Popular Mechanics had all sorts of DIY projects for making and repairing just about everything.
Did you make this project? Share it with us! I Made It! Bike handlebar extension customizable by francescofeltrin in Bikes. Reply Upvote. DennisO53 2 years ago. BrandonT 3 years ago. Phil B BrandonT Reply 3 years ago. Phil B jen4r0 Reply 3 years ago. Phil B davidd6 Reply 3 years ago. There is a much simpler way of doing this. Wait until you have your first puncture on that tube. I had debated on whether to patch or replace the tube, but then I realized that it would be a great experiment to see for myself whether tire sealant actually works, especially on slow leaks, which are the kind you generally get from the tiny holes that goat heads put in the tubes.
In order to put the sealant in the tire, my bicycle guy gave me some good advice. The rubber transfer tube that comes with these sealants is sized to be a press-fit on Shrader valves, which is much too large in diameter to seal on Presta valve stems. However, if you gradually cut the top of the cone-shaped nozzle until it is a press-fit for a. You can also use the.
You can use a spent. If your Presta valve has a removable core, you can even put the sealant in when the tire is on the bike.
Just rotate the valve to the top, insert the nozzle on the valve stem, and rotate it back around to the bottom. Squeeze in about 3 ounces of fluid, rotate back to the top, remove the bottle. Then replace the valve core and fill it with air.
I found that my tire that leaked down every 2 days consistently has now held its pressure for several weeks, which leads me to believe that this stuff actually works as advertised. Locate the thorn, nail or other offending object that caused your tire to go flat. If possible, remove it from the tire. Unscrew the white cap from the top of the bottle, peel off the white seal and then re-attach the white cap. Remove the clear tube from side of the bottle and attach one side to the top of the white bottle cap.
Attach the other side to the valve stem on your tire. The white tube fits perfectly over Schrader valves. If you have Presta valves, we recommend you attach a Presta valve adapter to the white tube for a tighter fit.
Squeeze in the appropriate amount of Slime. You can use the chart on the back of your bottle to determine how much Slime you need, or you can use our Slime calculator. In general, bike tires need 4 oz. If you are using the gallon product of Slime, then one pump equals approximately 1 oz of Slime.
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