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Slime. How much to you trust it?

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Slime. How much to you trust it?

Old 02-20-24, 11:30 AM
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Slime. How much to you trust it?

I have fat tires on a fat bike with the tires loaded with slime. I donít carry a tire repair kit. How much would you trust it?
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Old 02-20-24, 11:46 AM
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I haven't flatted in three years other than when my tires were worn down to the threads. I don't use Slime or anything else. Just tire and butyl tube. I still have a tube in my bag just in case.

It's not a matter of trust. It's just a matter of how often you flat. And whether or not it's a big deal if you do flat while out and about.
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Old 02-20-24, 11:57 AM
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Back in the 90s, I used slime inside of inner tubes and it worked really well against thorns. But I would never ride without a repair kit (spare tube, pump). Think about the scenario in which the puncture is too big for the slime to seal - what would you do in that case, would you prefer that over carrying a repair kit?
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Old 02-20-24, 01:31 PM
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I had Slime filled tubes fitted for a ride along some English canals just after the hawthorn hedges had been cut and when I removed the tubes there were 15 holes in the rear, 9 in the front and I had kept going with nothing more than topping the pressure up. Having said that I would not go far from home without a spare tube, I am not sure how well a patch would stick to a hole with Slime oozing out of it if needed.
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Old 02-20-24, 01:38 PM
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slime couldn't prove to me it could do as expected.
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Old 02-20-24, 02:28 PM
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Not at all.

If punctures are that much of a concern, consider puncture resistant tires or Tanis foam inserts.
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Old 02-20-24, 02:36 PM
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So going by the Slime website for a 2"x29" tire I would need about 7-8 ounces per tire.
Perhaps that 7-8 ounces per tire would be better suited for a more robust tire?
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Old 02-20-24, 04:14 PM
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Down here in Southern Arizona everything has thorns and I found slime might slow a small leak but not repair, you still need to find the leak and patch, which is now often a mess. I also tried it in a pneumatic hand cart tire and it has slowed the leak but not repaired so maybe it would allow you to get home for patching in some cases.
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Old 02-20-24, 04:27 PM
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I tried slime in the eighties and found that I liked Tuffy strips better. I currently prefer more robust tires. You having a fat bike, this might be more of a problem.
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Old 02-20-24, 06:18 PM
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I trust.

While verifying, I carry a pump. And a TPU tube.
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Old 02-20-24, 06:37 PM
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I've never known any one who had a positive experience with Slime, including myself. It is just a mess and if it does what it says, I've never seen it. It's just a proper mess. It doesn't stop the leak. It oozes between the tire and the tube coating everything in a slimy stink. In addition to not stopping the leak & stinking up the place, it also stops patches from sticking so you are worse off than when you started.

It is good at clogging valve holes. So, there is that if you don't like adding air to your tires every once in a while.

In short I do not trust it at all.

Product rating: -10 of 10
(It would be 0 of 10 but it actively does the opposite of what it claims.)
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Old 02-20-24, 06:59 PM
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Not at all, maybe if it was a tubeless set up and it was the slime tubeless sealant I would say sure but the slime they use for motor vehicles not at all. Basically if I was using tubes I would just use normal butyl inner tubes and keep them properly inflated and if I was really getting a lot of flats I would consider Tannus inserts if I was keeping tubes. Otherwise I would just go tubeless and use a good tubeless sealant and carry a tube just in case and hopefully never need it.

Slime is a product that makes a gooey mess and usually doesn't do much. You couldn't really pay me to use it.
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Old 02-20-24, 08:51 PM
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I started a thread last year about this. My position was that it worked well for low performance and low maintenance tires. To me, thatís the kids bikes, stroller wheels, and Iím pretty happy with it on my cargo ebike, when using extra thick tubes.

Itís not appropriate for being a long way from home or places you canít walk out of.

It has its place. Iím certain that I have not bought my last bottle of slime.
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Old 02-20-24, 09:17 PM
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One good sidewall cut - which happens - and your Slime will gush out and you will be stranded. At the very least carry a tube, pump and a dollar bill as a boot.
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Old 02-20-24, 09:59 PM
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My experience is that Slime treats a valve like a hole in the tube (which, technically, it is), and eventually clogs up the valve mechanism to the point that the valve itself is a slow leak. Presta or Schrader.

My wife used Slime in the tubes on her cruiser. One night she had an unexpected front blowout and came home looking like an (angry) extra from a Ghostbusters movie.

When I patch tubes for nonprofits, I consider sealant in the tube to be a strike against the tube, as these tubes can test fine but develop slow (or fast) leaks later.

I would never trust any sealant-filled tube sufficiently to not carry a spare and a patch kit.

An acquaintance of mine uses latex sealant in his tubeless mountain bike tires, and really likes it. But he still carries patches and boots.
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Old 02-20-24, 11:09 PM
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I carry an extra tube regardless of the tire set up. Especially off road. other than usual punctures, a side wall can get sliced, a valve can get damaged (yes, it's happened)
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Old 02-21-24, 02:39 AM
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All of these solutions are good and undoubtedly reduce punctures. But there's no way I'd go any distance without a backup. It's always possible to get a hole too big for slime to fix.

Edit: I should say reduce flats, since technically they don't actually reduce punctures, just mitigate them.

Last edited by jgwilliams; 02-21-24 at 02:40 AM. Reason: flats not punctures
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Old 02-21-24, 03:04 AM
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I tried the MUC off no puncture inner tube sealant which is similar to slime. It clogged my valve on the second day and caused a slow overnight leak for 2 days. But after reinflating several times, the valve cleared itself.

But somehow a slit appeared on the tube and was splitting. I think it was a manufacturing defect. I replaced the tube and stopped using the sealant.

When I use Schwalbe tires with greenguard, like the Marathon, I've never gotten punctures in the first 2 years of use.
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Old 02-21-24, 01:35 PM
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The Green Guards, after two years, have had zero flats and certainly should have with the $#!^ I have run over.
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Old 02-21-24, 06:05 PM
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My experiment has begun. Just loaded up the kids' tubes with Flat Attack tire sealant (4oz per tire, two bottles, total cost at the LBS $26) and we'll see how that goes. I'll never use the stuff for my bikes, as I can repair on the road in minutes. But a puncture is a much bigger deal in their world. 26" MTB and 20" BMX will be our subjects, with a routine history of goat head punctures that I get to patch. I'll report back.
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Old 02-21-24, 06:32 PM
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Originally Posted by Iride01
I haven't flatted in three years other than when my tires were worn down to the threads.
I commented once how many years it had been since I flatted and soon after had a flat within two blocks from home as I was heading out. A similar thing happened when I mentioned I've never broke a chain. I'm never going to tell anyone I've never broke a spoke.
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Old 02-21-24, 07:14 PM
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No experience with Slime on bikes, but I have used Slime on 3 different occasions (I am hard of learning) on my cars. It failed to seal the leaks on all three of those occasions. No Slime anything for me any more.

Just go with the tried and true tubeless set up and forget about these half ash measures.
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Old 02-23-24, 07:49 PM
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I patched a tubular tire puncture with slime. The next day I pumped it to full pressure then bent over to get a close look. At that moment the slime blasted out of the puncture and directly into my eye. No more slime.
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Old 02-23-24, 08:16 PM
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Originally Posted by Dudelsack
I have fat tires on a fat bike with the tires loaded with slime. I donít carry a tire repair kit. How much would you trust it?
Stuff happens. A large enough and sharp enough object can defeat any slime you would ever want to put in a tire and ride. I insist on having the capability to get me though such a cut, repair the tire to rideable and inflate several times. Or stay within walking distance or cell phone range of someone who will pick you up without adverse consequences.
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Old 02-23-24, 09:32 PM
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Slime is great for bigger tires. No so much for road. My experience
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