Slime Smart Tube Self Healing 700c x 28-32 Presta Inner Tubes (Pack of 2)

Easy to fit, simple but effective at a good realistic price.

Generally good product although I have had two occasions where tubes have split along seam near to valve. Not sure whether a product fault or fitting issue.

Bought these tubes for my fairly skinny 700c tyres. The tyres I use are good quality Marathon so I felt I had done all I could to protest against punctures. Obviously the only real way to have an opinion on these if if you actually get, and know you have got a puncture. So here is my experience. Fitting no problem, subsequently the tyres seemed a little different in terms of comfort and rolling resistance but no great issue.On a recent ride I noticed the rear tyre had lost a lot of pressure. I might have made it home on the almost flat tyre but decided to pump up the tyre which was successful. I completed the ride making sure to check the tyre regularly. Popped the bike in the shed when i got home thinking slime might have formed a permanent seal. In the morning the tyre was flat and I resigned myself to patching the tube. However before removing the tyre I spotted a deeply embedded thorn which I removed with tweezers. I then pumped the tyre up during which time I heard air hissing out of the tube initially but then stopping. I fully inflated the tyre and two weeks later it is still fine. My assumption is that slime could not form a proper seal around the thorn which was probably still moving around when I was riding the bike. I am now interested to see how long the slime seal works. So my conclusion is, this works more or less as advertised but when you get a reasonable size hole you could lose quite a bit of air before the seal forms so carrying a pump is important. Not a magic bullet but I'm reasonably impressed to be fair..Edit April 2023. Out of complete fairness to the supplier/ manufacturer I decided to add an edit to this some 8 months after mentioning that I had a puncture and being interested how long the seal, once made would last. So its eight months and counting, I never did fix the puncture and the pressure holds well. Similarly no issues with the front tyre or indeed another bike in which I manually put slime into both tubes. Probably worth 4 and a half stars and maybe 5 if you recognise the limitations of pressure loss whilst the seal forms. On this basis I have added a star.

I have recently gone through two of these innertubes in short order. Something has changed in these tubes. I dunno if they're cutting corners on manufacture, but Punctures do not seal anymore. The slime just gets dumped into your pump when you blow the flat tubes up. Then the valve sticks open (at least that's how it is with the Presta ones).I have ridden thousands of miles on these innertubes in the past and trusted them implicitly, but no longer. I'm switching brands.

No better than normal tubes, got a puncture on first proper ride, deflated across the journey, fully deflated afterwards when I inspected what had got in there afterwards, thought they would re-seal? Now needs replacing, very disappointing

Checking my bike before a ride I noticed a small green tuft on my rear tyre. I pulled it away and air flowed out of the old puncture hole. It did so for maybe 10 seconds before resealing itself. Clearly, I had punctured on one of my previous rides, but the tube's sealant had done its job so thoroughly I hadn't even noticed.Before I bought these tubes I had had a tubeless setup, but the hassle of sealant and mounting the tyres to the rim was such a massive pain that I gave up on it.These inner tubes are excellent, and a thousand times easier than tubeless. Sure, they're heavier than tubeless or performance tubes, but unless you're an elite club rider or road racer I would argue that interruption-free rides are more important than a few extra grams on the wheel. The whole point of cycling is not to achieve the lowest possible weight.

Product good, delivery service poor

Very effective in sealing punctures, one cut in the tube was about 4mm long but it still sealed the hole, it did need a top up of air but it lasted 30 miles home.

camera d'aria antiforatura si fa per dire? montati e gonfiati a 3 bar ed esplosi,,,,,non so se difettati ma 2 su 2 mi da pensare.... non li comprero mai piu

Buena relación precio y calidad

75% de chances de péter la chambre à air lors de l'installation : du liquide fuit à travers la valve.

Per la prima volta in vita mia mi si è rotta la valvola di una camera d'aria intanto che la pompavo quindi ho dei dubbi sulla validità dei materiali. Ma forse per quello che le vendono a coppie