Q-Tubes 700c presta valve tubes for 700c tires are a dependanble and affordable replacement tube. These tubes are made from Butyl rubber and have a presta valve. Choose from valve stem lengths of 32mm, 48mm, or 60mm depending on your rim depth.
Valve type: Presta (french) valve
ISO Diameter: 622 / road / 29"/630 / 27"
ISO Width: 19 mm/20 mm/21 mm/22 mm/23 mm/18 mm
Ummm, these are just spare tubes that I bought. Just regular old tubes and I am just keeping them as my extras. So, I'm not really reviewing this incredibly standard product. They probably work fine. But in general, I really love Fyxation. They're in my neighborhood. They are friendly and helpful. Their treaded road tires are the best road tires that exist for commuting. After 20 miles of daily NYC commuting, I can honestly say that Fyxation's road tires last me at least 3-4 times longer than a pair of gatorskins for serious urban conditions (and potholes).
Easy to buy, easy to install. Just what I expected.
Great overall product. Fit my 700x23c deep rim wheels with the 48mm just fine. I prefer the smaller length so that the valve doesn't stick out so much. My experience with Q Tubes Presta valves is that the air needs replenishing on a regular basis (every 2 weeks with 5 days/week riding). But otherwise are a great choice and almost all bike shops carry this brand -- normally for $8 or $9.
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