Standard Presta Valve Tube

Always the best service and products hands down.

5 flats in 2 weeks (including 2 on one day), and they go flat quickly. Very frustrating!

Very symmetrical tube. Had no problems with it. A little thinner than the old ""mountain tube"" they had previously. Come Springtime I will really get on them.

Tubes are light and support the light-weight aerodynamics of the Specialized S-Works Turbo tires!

I run my tires tubeless, but I've gotten several flats this fall and had to put in this tube. I have had zero issues inserting and inflating this tube. It also holds air extremely well. It's confidence inspiring when you can finish a ride with a tube as hard as you were riding before the flat.

I'm sorry Toni and Dillon butyl rubber is no match for thorns, glass and sometimes gas expansion and contraction laws. Specifically we are talking about Charles gas law, the volume of the gas varies directly with the temperature. Therefore as it cools the volume of air in your tires can decrease. You also may just have a slow leak. Flat tires, punctures and pinch flats are all part of cycling. It's the nature of the beast. Learning how to seat a tyre and tube properly makes for less feelings of bitterness to a manufacturer. I like these tubes they're hassle free like most tubes they serve their purpose well.

This is a fine tube, standard and perfectly good quality. In regards to the other two reviewers complaining of getting flat tires... that just happens sometimes and is not the fault of these tubes, you should always carry a spare along with a pair of tire levers and portable pump for a quick and easy swap. Flat tires are especially not the fault of the type of bike you put these on. I don't own a Specialized brand bike but it's pretty silly to blame your flat tires on the brand of bicycle.