Using Stan's sealant in Kenda tires
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jpearce
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« on: July 15, 2007, 11:19:44 AM »
So I'm out with the Thursday night ride group last week, and after riding about 20 feet I start to hear this thumping noise from the back of the bike.  I look at the back tire (a Kenda tubeless) and see several massive blisters sticking out from the tire.  One is about as big around as my thumb and is catching on the frame above the brake.  I pulled the tire off and found that the blister was sticking out into the inside the tire as far as it was to the outside!  The tire wall had delaminated, filled with air, and sealed itself.  The blister had also filled itself with Stan's, which I found out when I popped it (white goopy stuff all over the place).  I popped all of the remaining blisters, put a tube in the tire and started riding again.  That worked for about a mile when another blister formed.  At that point I gave up, popped that one, and headed back to the car.

At PedrosFest on Friday I asked the Kenda guy about it.  His first question was "Did you use Stan's?".  I hadn't, but the guy who sold me the bike had put about a cup of the stuff into each tire.  He said that the stuff is well-known for eating the sidewalls of tires.  He cleaned the stuff off of the wheels and put two new tires on.  So far that's working.

His recommendation for tubeless tires was to not use any sealant products at all.  He also said that Kenda tubeless tires are made out of the same stuff that car tires use, which is different from what normal bike tires are made of.  To patch them, you should use patches made for car tires, not bike tube or tire patches.  So it looks like I'm heading to Pep Boys instead of Keswick for my tire patches.

Maybe everyone else knows this, but it was pretty enlightening for me.  It was also enlightening to see these huge bumps appearing in the sidewalls of my tires.  If you're using Stan's in Kenda tires, maybe you'll get to see them too.

Jon
« Last Edit: July 15, 2007, 08:14:51 PM by jpearce » Logged
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crabapple hits
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« Reply #1 on: July 15, 2007, 07:29:04 PM »
Hmm - interesting Jon. I only use tubeless (Maxxis Minion DH) on my DH bike and I only use a spare amount of a sealant around the bead. Have not had a flat or blisters as you describe. BOO for Pedro's!
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DrSaw
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« Reply #2 on: July 16, 2007, 06:51:20 AM »
I sent you a private message after I saw you battling with it in the parking lot, John. My friend had Kenda tires with a scoop or two of Stans, and his tires did the same thing.

Seems to be a Kenda issue with Stan's; I have had at least 4 other brands of tubless tires using Stan's, with no issues.

Neil
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dieselkarl
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« Reply #3 on: July 16, 2007, 05:15:31 PM »
Must be a Kenda thing as Continental works fine w/stan's.  In Kenda's catalog they even have a disclaimer about any liquid sealant voiding their warranty.  Wonder if Stan's site reflects this in their breakdown of stans and tire compatability. 

Karl
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jpearce
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« Reply #4 on: July 16, 2007, 09:20:00 PM »
THe Kenda guy mentioned that the Stan's site refers to a group of references as to how good the stuff is.  But apparently about 1/3 of the references say that it eats up the tires. 
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« Reply #5 on: July 17, 2007, 06:29:18 PM »
I've used stans in a bunch of different tires and never seen this. The problem I have with Regular Kenda tires is thier sidewalls are weak. My nomad came with Nevagal's and I recently took them off in favor of High Rollers converted to tubeless. I kept flatting the Nevagals.
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