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
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.