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Monday, February 13, 2006

How to slime a presta tube

Here in cactus country, if you have a bike with tubes, slime is a musthave. Schrader valves are easy to slime your self - just pull the valve core and squeeze the stuff in. Of course you can buy pre-slimed presta tubes. Presta valves are a little bit more difficult to slime yourself.

This one took me a while to figure out. I had heard of people cutting a hole in the tube, adding slime and then patching the tube. This type of surgery was entirely too invasive for my tastes, plus the slime is too slippery and makes patching difficult.

This method is less invasive and really easy to do. First thing to do is to cut the end off of the threaded rod that connects to the valve. this end comes blunted from the factor to keep the nut from unthreading. I used to do this with a dremmel cut off whell, but found that a pair of side dykes work just as well. Snip the very end off of the threaded rod - just enough that you can unscrew the nut.

Next is a bit hard part to explain. Drop the valve core into the tube and pinch it through the tube. The picture shows a cutaway of the valve core inside the tube. You want to hold it away from the valve tube so the slime can enter.

Now slip the slime tube onto the stem for a good seal and squeeze that gooey stuff in there. Once finished, fish the valve rod back into the tube and screw the nut back on.

Now you are prepared to ride over all sorts of pointy things.


At Tuesday, October 03, 2006 12:20:00 PM, Blogger John said...

thanks for posting this. too bad that they don't make most PV valves like they do on tubular tires (removable)

At Sunday, August 19, 2007 1:06:00 PM, Anonymous Anonymous said...

thanks man! I've been wondering how to do this. I just successfully completed the sliming.

At Sunday, August 19, 2007 4:25:00 PM, Anonymous Anonymous said...

completely unnecessary to snip the end, just unthread the nut with some small pliers.

At Friday, April 04, 2008 12:14:00 AM, Anonymous Anonymous said...

ffffffanks alot!

At Thursday, April 10, 2008 3:53:00 PM, Anonymous Anonymous said...

How about you tie a sewing thread to the end of the valve after taking the nut off so you dont lose it inside the tube. Seems like an easy job to pull it out after you've slimed it.

At Wednesday, April 29, 2009 6:02:00 AM, Anonymous mclarkie said...

Thanks for posting this up and the handy tips from others on here , I used a pair of pliers to undo the nut from the valve and tied a bit of thread to the valve before dropping it into the tube so I could retreave it after pumping the my green goo in there.

At Thursday, November 17, 2011 6:08:00 PM, Anonymous Anonymous said...

Did this about 4 months ago. Worked great!! Just have to remember to not unspin the nut too far. And my tire gauge works still!
I tried the thread thing. All that happened is that I lost the thread. But I was still able to push the valve back into place.


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