I received them in January. Everyone failed. Two of the tubes were longer than 700 seconds and flattened from folding in the tire. Three (yes _3_) of these hissed right after the first inflation. I may have gotten a bad batch, but these were literally worse than junk. Went to local bike shop and bought some decent inner tubes - no problem for 3 months. For the record, I am almost 60 years old, have raced from my mid late teens to early 20's and have raced and serviced a variety of motorcycles for over 45 years. Actually, I know how to change the tube, so we won't do it.
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