Because it's hard to know when you're going to get a flat, it's always good to have extra tubes on hand. Specialized's Thorn Resistant Tube is thicker on the road side for puncture protection and thinner on the rim side for weight savings.
|Schrader Valve / 12 x 1.5-2.125||719676216027||031-01402||SVT195611235|
|Schrader Valve / 700 x 28-38c||719676215969||030-01308||SVT17878301C|
|Schrader Valve / 16 x 1.5-2.125||719676216034||031-01403||SVT194128795|
|Schrader Valve / 24 x 1.5-2.2||719676216065||031-01534||SVT196313665|
|Presta Valve / 26 x 1.75-1.95||719676506661||0317-0450||PVT192815725|
|Presta Valve / 29 x1.9-2.3||719676945743||0311-0400||PVT31713742V|
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I've been commuting to work for about 15 years now and do approximately 6 miles each way in San Francisco. After a series of flats I decided to splurge and grab a set of these for my Specialized, and was thinking - Great The extra thickness will definitely decrease my chances of a flat, enough to offset the extra weight. Unfortunately, both tubes lasted less than 4 months due to the valve stem ripping while inflating. I usually fill my tires about every 3 days and am very easy while attaching the pump head and taking it off. I've had basic cheapo tubes last a year or more and was very disappointed for the amount of money they cost. Maybe I just got part of a bad batch....