Great tubes, the stems are solid, hold air well. I like the removable core as I prefer to add my own sealant. I use about 1/2 of what the pre-slimed tubes come with, and I prefer to put Stans in the tubes.
I ride a hardtail so pinch-flats in my rear tube happen all the time. I bought new tires, rims, and these tubes and in the past month I have had zero flats. I can't say that the lack of flats is directly attributable to the tubes but I'll give them a little credit.
PROS: Lightweight, Good Stem Length, Puncture Resistant, Easy To Regulate
Bought as back up for patched tubes- yes I said that correctly. Patched tubes holding up well, one of two Qtubes is also. 1st Qtube was outfitted with a self removing presta valve. Found out the hard way at the worst time. Check your 6. Remaining Qtube is working admirably as intended. Fred "Bad Luck" Schleprock
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