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I put these in new Michelin tires so don't expect
a leak or flat in coming months.
I'm tired of Ebay 26" tubes (4) that
leak at stem or blow out within a month actually
with the bike parked.
Some what difficult to pack into the tire but
with extra care and time it works. Mounting the
valve stem without a slant is a wrestling match.
I run them at 78 PSI although the tire is
rated 86 PSI and they leak down 6 PSI or so
every 7 - 10 days just like all tubes.
I use this on my MTB with Continental street tires. I use the bike on roads, trails and hard pack gravel. I've gotten punctures with this tube but the slime slows the rate of air loss and it's enabled me to get home without changing the tube.
I thought I would try a different brand of tubes. I had for years used the Slime tubes. But the slime welds your damn valve caps on. I tried these tubes and they are thick and seem real durable. I have been running them for a month and no "Goatheads" have punctured them yet!!!
Not a ton of miles on them yet, but everything about them so far has been great. The quality is notable from the time you take them out of the box. They install easily and do not seem to loose air like most tubes. Just a really nice tube.
Before getting these tubes and matching Michelin Country Rock tires I had two flats in two weeks. With these tubes and tires I've had no flats in 2,000 miles of bike trails, gravel, rocks, and occasional dirt. These tubes are highly recommended.
I rode the bike for a few weeks, then one day come to the bike for my morning ride and tire was flat. Filled it with air and after five miles, it was flat again. Filled it on more time and it has stayed inflated for days! Be patient, be sure to spin the tire after reinflating to allow the green stuff to seal the tube.
I purchased 4 of these about 2 years ago (2 for my road bike and 2 for my wife,s touring bike). Place them inside Michelin tires and neither of us has had a flat yet. We live in in area where flats are are common occurrence as the trees here drop very sharp spiny thorns.
My neighbors use slimy tubes and slimy fillers and they are consistently fixing their flats.
In my area we have goat heads galore. I average 1 goat heads per 10 mile ride and I make a conscious effort to stay on the pavement. That means I was repairing a tube after or during every ride. I put one of these baby on and, as usual, got a nasty big goat head half way through the ride. When I pulled it out I could hear the air escaping for about 3 or 4 seconds and I thought I was done. But no! It quit leaking quickly enough that I finished the remaining half hour of my ride and it was fine. Didn't even have to add air. From here forward there's only one kind of tube going in my mtn bike tires. And no, my last name's not Michelin -)
Got my first' flat' and it does not appear to be completely sealing - pressure drops again after 24-48 hrs but holds for a ride. My experience with goo tubes is that sometimes you have to refill the tire several times. I also use tube protectors as I ride pretty hostile (desert) trails.
This is a great Mtn bike tube for areas with goat head thorns. So far I have ridden 200 miles with out a flat puncture. I have never done that with any other sealants in tubes. I have tried them all !!! I'll post again as the summer months begin.