Expects the puncture, and seals it — at 644 g (22.7 oz)
Slime 26" self-sealing, Schrader
A 26-inch Schrader tube with sealant already inside, stated to seal punctures up to 3 mm (0.12 in) and to keep working for two years.
What you are getting
A 26” × 1.75-2.125 Schrader tube with sealant already inside it, claimed to “stop flats for 2 years” and to seal punctures up to 1/8” (3 mm (0.12 in)). 644 g (22.7 oz) — by far the heaviest tube in this group. $15.49.
It solves the puncture differently from everything else here
Every other tube on this page tries not to be punctured. This one expects to be, and seals the hole: “Slime Tube Sealant seeks out and instantly seals punctures in your tubes up to 1/8” (3 mm (0.12 in)) using Fibro-Seal Technology.”
Three millimeters is a real number and a generous one — a thorn, a staple, a small nail. What it will not fix is a pinch flat, where the tube splits along a line rather than being pierced, or a cut in the tire casing itself. The puncture repair shelf on this site is where the answer to those lives.
The weight is the sealant
644 g (22.7 oz), against 472 g (16.6 oz) for the thick-walled Ultraverse and 136 g (4.8 oz) for the Bell on the same wheel size. Roughly half a kilo of that is rubber and the rest is liquid, carried on the rim where rotating weight costs most.
On a commuter or a cargo bike that is an easy trade: half a kilo against not standing at the roadside. On anything ridden for sport it is not.
Two years, and what the clock is actually measuring
“Stop flats for 2 years because there is Slime inside.”
Sealant dries. That is the mechanism behind the interval, and it is the same one the tubeless sealant shelf on this site is built around — its own line is that sealant dries out on a schedule whether or not you have punctures. After two years the tube is an ordinary, very heavy tube, and nothing on this listing says whether more sealant can be added through the Schrader valve.
That is the question to ask before buying, because a Schrader valve with a removable core can be topped up and one without cannot.
Non-toxic, water soluble, and that matters at the bin
“Environmentally friendly. Non-toxic, non-corrosive and non-hazardous, non-flammable, water soluble.”
Water soluble is the practical half: sealant that washes off a rim, a brake rotor and a pair of hands with water rather than solvent. Anyone who has dealt with a dried latex sealant will recognize why it is worth stating.
It is sold for more than bicycles
“Works in bicycles, wheelbarrows, wheelchairs, jogging strollers, snow blowers and much more.”
True, and a sign of what this tube is: a sealed-in-advance tube for wheels that are a nuisance to repair, wherever they are.
What is not published
No ETRTO pair — inch sizes only, on a shelf whose buying advice is to read the ETRTO. No weight per tube, no sealant volume, no statement on topping up, and no stated pressure range. “Extra strong” is not a wall thickness.
Availability
Read on the day this page was built: $15 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text were read on 2026-10-06. The live price is at the top of the page.
