First, I'm an ex-bike mechanic, I know what I'm doing.
I got tired of flats from crap tubes just giving out on two particular bikes, so I bought 2 of these 'heavy duty slime tubes' to reduce the number of times I have to disassemble the rear tire on two bikes.
The first one I installed lasted a month or two, of gentle riding on concrete paths about 2x/week. The air was out this morning...turns out the valve split at the valve/tube interface. Garbage. The rim hole is smooth and clean.
The second one I unwrapped to replace the rear tube on a 2nd similar bike, I disassembled the bike, took the old tube out (went flat - garbage stem again), cleaned it all, checked it for burrs, etc...all good. Went to put in the new slime tube. It's too small. The 2nd tube they shipped has EXACTLY the same markings as the first one, in exactly the same box, all marked 26". It is actually a 24" tube. Useless, as I have no bikes with 24" wheels. Garbage.
I'm going to ride my other bike over to Target and buy two off-the-shelf tubes. At least those tubes know they're cheap garbage.
What a waste of good money these expensive slime tubes were.
:(
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